TWI795076B - Heat treatment method for steel material - Google Patents

Heat treatment method for steel material Download PDF

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TWI795076B
TWI795076B TW110142446A TW110142446A TWI795076B TW I795076 B TWI795076 B TW I795076B TW 110142446 A TW110142446 A TW 110142446A TW 110142446 A TW110142446 A TW 110142446A TW I795076 B TWI795076 B TW I795076B
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steel
heat treatment
carbon
temperature
treatment method
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TW202321469A (en
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曹德綱
許曉弘
李炳坤
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中國鋼鐵股份有限公司
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Abstract

A heat treatment method for a steel material is disclosed. In this method, the steel material is provided. The steel material includes carbon (C) with a weight percentage from 4.0% to 8.0%, silicon (Si), manganese (Mn), molybdenum (Mo), vanadium (V), aluminum (Al), nitrogen (N), iron (Fe), and impurities. A quenching treatment is performed on the steel material. Performing the quenching treatment includes controlling a carbon potential of a protective atmosphere in an austenitization soaking phase of the quenching treatment between 0.6% and 1.5%. The method further includes performing a tempering treatment on the steel material after performing the quenching treatment.

Description

鋼材之熱處理方法Heat treatment method of steel

本揭露是有關於一種熱處理技術，且特別是有關於一種鋼材之熱處理方法。 The disclosure relates to a heat treatment technology, and in particular to a heat treatment method for steel.

製作高溫滲碳鋼製零件時，鋼材需先在約950℃之溫度下進行滲碳持溫一段時間，接著分別在約850℃與約170℃之溫度下進行淬火與回火步驟。以這樣的方式進行調質熱處理後，可於鋼材形成表面滲碳，藉此對於鋼材之剝落強度及低循環疲勞強度有強化效果。 When making high-temperature carburizing steel parts, the steel needs to be carburized at a temperature of about 950°C for a period of time, and then quenched and tempered at a temperature of about 850°C and about 170°C respectively. After quenching and tempering heat treatment in this way, surface carburization can be formed on the steel material, thereby enhancing the peeling strength and low cycle fatigue strength of the steel material.

然而，此方法需對鋼材進行首道溫度為約950℃之高溫的滲碳工序，所需成本高且需消耗較多能源。因此，亟需一種能夠降低成本及能源消耗，同時可兼顧鋼材強度的方法。 However, this method requires a first carburizing process at a high temperature of about 950° C., which requires high cost and consumes a lot of energy. Therefore, there is an urgent need for a method that can reduce cost and energy consumption while taking into account the strength of steel.

因此，本揭露之目的就是在提供一種鋼材之熱處理方法，其結合調質熱處理製程及滲碳強化的概念，在熱處理鋼材之淬火階段的沃斯田鐵化持溫過程中，藉由提高保 護氣氛之碳勢，使鋼材經熱處理後表面達滲碳效果並形成滲碳層。如此可提升鋼材之扭力強度及抗扭力疲勞性，以穩固產品品質。 Therefore, the purpose of this disclosure is to provide a heat treatment method for steel, which combines the concept of quenching and tempering heat treatment process and carburizing and strengthening. Protect the carbon potential of the atmosphere, so that the surface of the steel after heat treatment can reach the carburizing effect and form a carburizing layer. In this way, the torsional strength and torsional fatigue resistance of steel can be improved to stabilize product quality.

本揭露之另一目的就是在提供一種鋼材之熱處理方法，其將淬火處理前之高溫滲碳持溫工序結合至淬火處理中，如此可降低熱處理成本，並可加速生產，且可達到節能減碳之目的。 Another purpose of this disclosure is to provide a heat treatment method for steel, which combines the high-temperature carburizing and temperature-holding process before quenching treatment into the quenching treatment, which can reduce heat treatment costs, speed up production, and achieve energy saving and carbon reduction purpose.

根據本揭露之上述目的，提出一種鋼材之熱處理方法。在此方法中，提供鋼材。鋼材包含約0.1wt%至約0.6wt%之碳、矽、錳、鉬、釩、鋁、氮、以及鐵與雜質。對鋼材進行淬火處理。進行淬火處理包含控制淬火處理之沃斯田鐵化持溫階段之保護氣氛的碳勢為約0.6%至約1.5%。此方法更包含在進行淬火處理後，對鋼材進行回火處理。 According to the above purpose of the present disclosure, a method for heat treatment of steel is proposed. In this method, steel is provided. The steel contains about 0.1 wt% to about 0.6 wt% of carbon, silicon, manganese, molybdenum, vanadium, aluminum, nitrogen, and iron and impurities. Quenching the steel. Performing the quenching treatment includes controlling the carbon potential of the protective atmosphere in the Worthfield ironization holding stage of the quenching treatment to be about 0.6% to about 1.5%. This method further includes tempering the steel material after the quenching treatment.

依照本揭露之一實施例，上述鋼材包含碳鋼材料或合金材料。 According to an embodiment of the present disclosure, the steel material includes carbon steel material or alloy material.

依照本揭露之一實施例，進行上述淬火處理包含在上述鋼材之表面形成滲碳層。 According to an embodiment of the present disclosure, performing the quenching treatment includes forming a carburized layer on the surface of the steel.

依照本揭露之一實施例，進行上述淬火處理所形成之滲碳層的厚度為約10μm至約5mm。 According to an embodiment of the present disclosure, the thickness of the carburized layer formed by performing the above quenching treatment is about 10 μm to about 5 mm.

依照本揭露之一實施例，上述保護氣氛中之碳勢氣氛包含一氧化碳、甲烷、丙烷、或其任意組合。 According to an embodiment of the present disclosure, the carbon potential atmosphere in the protective atmosphere includes carbon monoxide, methane, propane, or any combination thereof.

根據本揭露之上述目的，另提出一種鋼材之熱處理方法。在此方法中，首先提供鋼材。鋼材包含約0.1wt% 至約0.6wt%之碳、矽、錳、鉬、釩、鋁、氮、以及鐵與雜質。對鋼材進行淬火處理，以將鋼材升溫至沃斯田鐵化溫度並持溫一段時間。在沃斯田鐵化溫度下持溫時包含控制保護氣氛，以在鋼材之表面形成滲碳層，滲碳層之厚度為約10μm至約5mm。此方法更包含在進行淬火處理後，對鋼材進行回火處理。 According to the above purpose of the present disclosure, another method for heat treatment of steel is proposed. In this method, steel is provided first. Steel contains about 0.1wt% Up to about 0.6 wt% of carbon, silicon, manganese, molybdenum, vanadium, aluminum, nitrogen, and iron and impurities. Quenching treatment is carried out on the steel to raise the temperature of the steel to the ferrochemical temperature of Worthfield and keep the temperature for a period of time. Holding the temperature at the Worthfield ironization temperature includes controlling the protective atmosphere to form a carburized layer on the surface of the steel. The thickness of the carburized layer is about 10 μm to about 5 mm. This method further includes tempering the steel material after the quenching treatment.

依照本揭露之一實施例，上述鋼材包含碳鋼材料或合金鋼材料。 According to an embodiment of the present disclosure, the steel material includes carbon steel material or alloy steel material.

依照本揭露之一實施例，上述在鋼材之表面形成滲碳層包含控制上述保護氣氛之碳勢為約0.6%至約1.5%。 According to an embodiment of the present disclosure, forming the carburized layer on the surface of the steel includes controlling the carbon potential of the protective atmosphere to be about 0.6% to about 1.5%.

依照本揭露之一實施例，形成上述滲碳層包含控制上述保護氣氛之碳勢為約0.8%。 According to an embodiment of the present disclosure, forming the carburized layer includes controlling the carbon potential of the protective atmosphere to about 0.8%.

依照本揭露之一實施例，上述保護氣氛之碳勢氣氛包含一氧化碳、甲烷、丙烷、或其任意組合。 According to an embodiment of the present disclosure, the carbon potential atmosphere of the protective atmosphere includes carbon monoxide, methane, propane, or any combination thereof.

100:方法 100: method

120:步驟 120: Step

140:步驟 140: step

160:步驟 160: step

200:淬火處理 200: quenching treatment

202:沃斯田鐵化持溫階段 202:Worth field ironization temperature holding stage

210:回火處理 210: tempering treatment

212:回火持溫階段 212: Tempering holding temperature stage

配合所附圖式閱讀能使本揭露之目的、特徵、優勢、以及實施例能夠更簡單易懂。需注意的是，根據業界的標準實務，各特徵並未依比例繪示。事實上，為了使討論更為清楚，可任意地增加或減少各特徵的尺寸。 The purpose, features, advantages, and embodiments of the present disclosure can be more easily understood when read in conjunction with the accompanying drawings. It is to be noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or decreased for clarity of discussion.

圖1係繪示依照本揭露之一實施方式之一種鋼材之熱處理方法的流程圖。 FIG. 1 is a flowchart illustrating a heat treatment method for steel according to an embodiment of the present disclosure.

圖2係繪示依照本揭露之一實施方式之一種鋼材之熱處理 方法的淬火與回火熱處理製程的示意圖。 Fig. 2 shows the heat treatment of a steel material according to an embodiment of the present disclosure A schematic diagram of the quenching and tempering heat treatment process of the method.

圖3係繪示進行扭力強度試驗及扭力疲勞試驗之標準試棒的示意圖。 Fig. 3 is a schematic diagram showing a standard test bar for a torsional strength test and a torsional fatigue test.

圖4係繪示依照本揭露之鋼材之熱處理方法之一實施例與比較例樣品在不同沃斯田鐵化持溫時間下的扭力強度比較圖。 FIG. 4 is a graph showing the comparison of the torsional strength of the steel heat treatment method according to an embodiment of the present disclosure and a comparative sample under different holding times for the ferromagnetic ironization.

圖5係繪示依照本揭露之鋼材之熱處理方法之一實施例與比較例樣品的扭力疲勞壽命比較圖。 FIG. 5 is a graph showing the comparison of the torsional fatigue life of an example of a heat treatment method for steel according to the present disclosure and a sample of a comparative example.

在現有的滲碳鋼材熱處理方法中，對鋼材進行淬火與回火等熱處理步驟前，需先進行一道高溫下的滲碳工序，如此不僅增加生產時間，亦需較高的生產成本及能源消耗。有鑑於此，本揭露提出一種鋼材之熱處理方法，其結合調質熱處理製程及滲碳強化概念，在熱處理鋼材之淬火階段的沃斯田鐵化持溫過程中，藉由提高保護氣氛之碳勢，使鋼材經熱處理後表面達滲碳效果而形成滲碳層，進而可提升鋼材之扭力強度及抗扭力疲勞性。如此可穩固以此鋼材所製作之產品，例如軸類、扣件、手工具等重視扭力性能之產品的品質，同時可實現降低熱處理成本、加速生產、以及節能減碳之目的。 In the existing heat treatment method for carburizing steel, before performing heat treatment steps such as quenching and tempering on the steel, a carburizing process at high temperature is required, which not only increases the production time, but also requires higher production costs and energy consumption. In view of this, this disclosure proposes a heat treatment method for steel, which combines the quenching and tempering heat treatment process and the concept of carburizing and strengthening. , so that the surface of the steel after heat treatment reaches the carburizing effect to form a carburized layer, which can improve the torsional strength and torsional fatigue resistance of the steel. This can stabilize the quality of products made of this steel, such as shafts, fasteners, hand tools and other products that emphasize torque performance, and at the same time can achieve the goals of reducing heat treatment costs, speeding up production, and saving energy and reducing carbon.

請同時參照圖1與圖2，圖1係繪示依照本揭露之一實施方式之一種鋼材之熱處理方法的流程圖，圖2係繪示依照本揭露之一實施方式之一種鋼材之熱處理方法的淬 火與回火熱處理製程的示意圖。進行本揭露之方法100時，可先進行步驟120，以提供鋼材。在一些示範例子中，鋼材主要可包含約0.1wt%至約0.6wt%之碳，此鋼材亦可包含但不限於矽、錳、鉬、釩、鋁、氮等合金元素，而剩餘部分為鐵與不可避免之雜質。在一些例子中，鋼材可包含碳鋼材料或合金鋼材料。在一些其他例子中，鋼材可包含任意適合的材料。舉例而言，在一些實施例中，鋼材可為碳含量約0.4%之SCM440鋼材。 Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 1 is a flow chart of a heat treatment method for steel according to an embodiment of the present disclosure, and FIG. 2 is a flowchart of a heat treatment method for steel according to an embodiment of the present disclosure. Quenching Schematic diagram of the fire and temper heat treatment process. When performing the method 100 of the present disclosure, step 120 may be performed first to provide steel. In some exemplary examples, the steel may primarily contain about 0.1 wt% to about 0.6 wt% carbon, and the steel may also contain, but is not limited to, alloying elements such as silicon, manganese, molybdenum, vanadium, aluminum, nitrogen, and the remainder is iron and unavoidable impurities. In some examples, the steel material may comprise carbon steel material or alloy steel material. In some other examples, the steel may comprise any suitable material. For example, in some embodiments, the steel may be SCM440 steel with a carbon content of about 0.4%.

備妥鋼材後，可接著進行步驟140，以對鋼材進行淬火處理200。進行淬火處理200時，可先將鋼材升溫至沃斯田鐵化溫度，並持溫一段時間，如圖2所示之沃斯田鐵化持溫階段202。於沃斯田鐵化持溫階段202後，再將鋼材降溫至室溫。鋼材之沃斯田鐵化溫度可隨鋼材之種類及所含成分而改變。在一些例子中，當鋼材之溫度在淬火處理200中到達其沃斯田鐵化溫度時，可控制保護氣氛之碳勢，藉以在鋼材之表面形成滲碳層。在一些示範例子中，可控制淬火處理200之沃斯田鐵化持溫階段202之保護氣氛的碳勢為約0.6%至約1.5%。舉例而言，可控制沃斯田鐵化持溫階段202之保護氣氛的碳勢為約0.8%。具體而言，可藉由控制保護氣氛中之碳勢氣氛的組成氣體，來控制保護氣氛之碳勢。在一些示範例子中，保護氣氛中之碳勢氣氛可包含一氧化碳、甲烷、丙烷、或其任意組合。然而，在本揭露中，保護氣氛中之碳勢氣氛不限於上述氣體，而可包含可達成所需碳勢之任意適合的含碳氣體、或 其組合。 After the steel is prepared, step 140 may be followed to perform quenching treatment 200 on the steel. When performing the quenching treatment 200 , the steel can be heated up to the temperature of Worthfield ironization and maintained for a period of time, as shown in FIG. After the temperature-holding stage 202 of the ironization of Wostian, the temperature of the steel is lowered to room temperature. The ironization temperature of steel can vary with the type and composition of the steel. In some examples, when the temperature of the steel material reaches its Worthfield ironization temperature during the quenching treatment 200, the carbon potential of the protective atmosphere can be controlled to form a carburized layer on the surface of the steel material. In some exemplary examples, the carbon potential of the protective atmosphere in the Worthfield ferrization holding stage 202 of the quenching treatment 200 can be controlled to be about 0.6% to about 1.5%. For example, the carbon potential of the protective atmosphere in the Wostian ironization holding temperature stage 202 can be controlled to be about 0.8%. Specifically, the carbon potential of the protective atmosphere can be controlled by controlling the constituent gases of the carbon potential atmosphere in the protective atmosphere. In some exemplary examples, the carbon potential atmosphere in the protective atmosphere may include carbon monoxide, methane, propane, or any combination thereof. However, in the present disclosure, the carbon potential atmosphere in the protective atmosphere is not limited to the above-mentioned gases, but may include any suitable carbon-containing gas that can achieve the desired carbon potential, or its combination.

在淬火處理200之沃斯田鐵化持溫階段202控制保護氣氛之碳勢，可促使保護氣氛之碳勢氣氛中的碳原子因濃度差異而擴散到鋼材之表層中，進而在鋼材之表面形成滲碳層。在本實施方式中，對鋼材進行淬火處理200時，透過控制沃斯田鐵化持溫階段202之保護氣氛之碳勢氣氛中的碳勢，可使得碳勢氣氛中的碳原子在沃斯田鐵化溫度下的持溫過程擴散到鋼材之表層中，而形成滲碳層。在一些示範例子中，於淬火處理200後，形成於鋼材表面之滲碳層的厚度可為約10μm至約5mm。在一些實施例中，形成滲碳層於鋼材之表面後，滲碳層中之碳的濃度可為約0.4%以上至約1.0%。藉由控制淬火處理200之沃斯田鐵化持溫階段202之保護氣氛的碳勢，可在鋼材之表面形成滲碳層，進而可提升鋼材之扭力強度及抗扭力疲勞性。 Controlling the carbon potential of the protective atmosphere at the temperature holding stage 202 of the quenching treatment 200 can promote the carbon atoms in the carbon potential atmosphere of the protective atmosphere to diffuse into the surface layer of the steel due to concentration differences, and then form on the surface of the steel. Carburized layer. In this embodiment, when the steel is subjected to quenching treatment 200, by controlling the carbon potential in the carbon potential atmosphere of the protective atmosphere in the temperature holding stage 202 of Worthfield ironization, the carbon atoms in the carbon potential atmosphere can be kept in the Worthfield The temperature-holding process at the ironization temperature diffuses into the surface layer of the steel to form a carburized layer. In some exemplary examples, after the quenching treatment 200, the thickness of the carburized layer formed on the surface of the steel may be about 10 μm to about 5 mm. In some embodiments, after the carburized layer is formed on the surface of the steel, the concentration of carbon in the carburized layer may be from about 0.4% to about 1.0%. By controlling the carbon potential of the protective atmosphere in the quenching treatment 200 and the temperature holding stage 202 of the Wostian ironization, a carburized layer can be formed on the surface of the steel, thereby improving the torsional strength and torsional fatigue resistance of the steel.

於淬火處理200中形成滲碳層後，可進行步驟160，以對鋼材進行回火處理210。進行回火處理210可包含將鋼材升溫至回火溫度，並持溫一段時間，如圖2所示之回火持溫階段212。於回火持溫階段212後，再將鋼材降溫至室溫。對鋼材進行回火處理210，可消除或減少因淬火處理200所造成的應力，使鋼材之結構穩定並降低鋼材之脆性，而可提升鋼材之韌性及塑性。藉此，相較於未控制保護氣氛之碳勢的熱處理技術，使用本揭露之鋼材之熱處理方法進行熱處理後的鋼材及其產品可具有較高的扭力強度及抗扭力疲勞性。 After the carburized layer is formed in the quenching treatment 200 , step 160 may be performed to temper the steel material 210 . Performing the tempering treatment 210 may include raising the temperature of the steel material to the tempering temperature and maintaining the temperature for a period of time, such as the tempering and maintaining temperature stage 212 shown in FIG. 2 . After the tempering holding stage 212, the temperature of the steel is lowered to room temperature. Tempering the steel 210 can eliminate or reduce the stress caused by the quenching 200, stabilize the structure of the steel, reduce the brittleness of the steel, and improve the toughness and plasticity of the steel. Therefore, compared with the heat treatment technology without controlling the carbon potential of the protective atmosphere, the steel and its products after heat treatment using the heat treatment method of the disclosed steel can have higher torsional strength and torsional fatigue resistance.

以下就實施例與比較例說明本揭露之功效。請一併參照圖3、圖4、及圖5，圖3係繪示進行扭力強度試驗及扭力疲勞試驗之標準試棒的示意圖，圖4係繪示依照本揭露之鋼材之熱處理方法之一實施例與比較例樣品在不同沃斯田鐵化持溫時間下的扭力強度比較圖，圖5係繪示依照本揭露之鋼材之熱處理方法之一實施例與比較例樣品的扭力疲勞壽命比較圖。在實施例與比較例中，皆提供碳含量約0.4wt%之SCM440鋼材為樣品。接著，分別對實施例與比較例之鋼材樣品進行如圖2所示之淬火處理200，其中沃斯田鐵化之溫度為約840℃，持溫時間為約1小時。二者的差異在於，在實施例中，於淬火處理200之沃斯田鐵化持溫階段202時，控制保護氣氛之碳勢為約0.8%，而在比較例中，則將沃斯田鐵化持溫階段202之保護氣氛的碳勢控制在約0.4%。 The effects of the present disclosure are described below with reference to examples and comparative examples. Please refer to Figure 3, Figure 4, and Figure 5 together. Figure 3 is a schematic diagram of a standard test bar for a torsional strength test and a torsional fatigue test. Figure 4 is a schematic diagram of one of the heat treatment methods for steel according to the disclosure Figure 5 is a comparison chart of the torsional fatigue life of the samples according to one of the heat treatment methods of steel disclosed in the present disclosure and the samples of the comparative examples. In the examples and the comparative example, the SCM440 steel material with a carbon content of about 0.4wt% is provided as a sample. Next, the quenching treatment 200 shown in FIG. 2 was carried out on the steel samples of the embodiment and the comparison example respectively, wherein the temperature of the ferrochemical was about 840° C., and the holding time was about 1 hour. The difference between the two is that, in the embodiment, during the temperature holding stage 202 of the quenching treatment 200, the carbon potential of the protective atmosphere is controlled to be about 0.8%, while in the comparative example, the carbon potential of the ferrite is controlled to be about 0.8%. The carbon potential of the protective atmosphere in the temperature holding stage 202 is controlled at about 0.4%.

進行淬火處理200後，可接著進行如圖2所示之回火處理210，其中回火持溫階段212之溫度可為約200℃，持溫時間可為約90分鐘。完成淬火處理200與回火處理210後，對實施例與比較例作金相分析，發現實施例之鋼材樣品近表面可產生滲碳效果，且產生滲碳層，反之比較例之鋼材樣品則無滲碳效果。 After the quenching treatment 200, the tempering treatment 210 as shown in FIG. 2 can be followed, wherein the temperature of the tempering holding stage 212 can be about 200° C., and the holding time can be about 90 minutes. After completing the quenching treatment 200 and tempering treatment 210, metallographic analysis was carried out on the examples and comparative examples, and it was found that the steel samples of the examples could produce carburizing effects near the surface and carburized layers, whereas the steel samples of the comparative examples had no carburizing effect.

接下來，將實施例與比較例之鋼材樣品製成如圖3所示之標準試棒，以進行扭力強度試驗。進行試驗前，試棒之表面皆經過拋光處理。進行扭力試驗時，可先將試棒之一端固定，再對試棒之另一端施加順時針方向且由0逐 漸加大之扭矩，並記錄試棒斷裂前的最大扭矩負荷，扭力強度試驗之結果如圖4所示。由圖4可知，在相同的沃斯田鐵化持溫時間下，使用本揭露之鋼材之熱處理方法熱處理後之實施例樣品的扭力強度明顯高於比較例樣品之扭力強度。 Next, the steel samples of the embodiment and the comparative example were made into a standard test bar as shown in FIG. 3 to carry out the torsional strength test. Before the test, the surface of the test bar was polished. When performing a torsion test, one end of the test rod can be fixed first, and then the other end of the test rod can be applied in a clockwise direction from 0 to 0. Increase the torque gradually, and record the maximum torque load before the test bar breaks. The results of the torsional strength test are shown in Figure 4. It can be seen from FIG. 4 that under the same temperature holding time of Worthfield ironization, the torsional strength of the samples of the examples after heat treatment using the heat treatment method of the disclosed steel is significantly higher than that of the samples of the comparative examples.

接著，再對製成如圖3所示之標準試棒的實施例與比較例樣品進行扭力疲勞試驗。與扭力強度試驗相同，進行扭力疲勞試驗前，試棒之表面同樣皆經過拋光處理。進行扭力疲勞試驗時，可先將試棒之一端固定，再對試棒之另一端施加順時針之扭矩，並逐漸增加至最大扭力負荷之80%後，扭矩再反向逐漸恢復至0。以此負荷變化進行扭力疲勞試驗，並記錄試棒斷裂前的循環次數，扭力疲勞試驗之結果如圖5所示。由圖5可知，使用本揭露之鋼材之熱處理方法熱處理後之實施例樣品的扭力疲勞壽命明顯高於比較例樣品之扭力疲勞壽命。 Then, the torsional fatigue test was carried out on the samples of the embodiment and the comparative example made of the standard test rod as shown in FIG. 3 . Same as the torsional strength test, before the torsional fatigue test, the surface of the test bar is also polished. When carrying out the torsion fatigue test, one end of the test bar can be fixed first, and then a clockwise torque is applied to the other end of the test bar, and gradually increased to 80% of the maximum torsional load, and then the torque is reversed and gradually returned to 0. The torsional fatigue test was carried out with this load change, and the number of cycles before the test bar broke was recorded. The results of the torsional fatigue test are shown in Figure 5. It can be seen from FIG. 5 that the torsional fatigue life of the example samples after heat treatment using the disclosed steel heat treatment method is significantly higher than that of the comparative example samples.

綜合上述試驗結果可知，相較於比較例製程之一般碳勢，使用本揭露之鋼材之熱處理方法控制高碳勢所製成之鋼材，不論是扭力強度或是扭力疲勞壽命皆明顯較高，可滿足重視扭力性能之鋼鐵產品的應用。 Based on the above test results, it can be seen that compared with the general carbon potential of the comparative example process, the steel produced by using the heat treatment method of the disclosed steel to control the high carbon potential has significantly higher torsional strength and torsional fatigue life. Satisfies the application of steel products that emphasize torsional performance.

由上述實施方式可知，本揭露之一優點就是因為本揭露之鋼材之熱處理方法結合調質熱處理製程及滲碳強化的概念，在熱處理鋼材之淬火階段的沃斯田鐵化持溫過程中，藉由提高保護氣氛之碳勢，使鋼材經熱處理後表面達滲碳效果並形成滲碳層。如此可提升鋼材之扭力強度及抗 扭力疲勞性，以穩固產品品質。 It can be seen from the above-mentioned embodiments that one of the advantages of the present disclosure is that the heat treatment method of the steel disclosed in this disclosure combines the concepts of quenching and tempering heat treatment process and carburizing and strengthening. By increasing the carbon potential of the protective atmosphere, the surface of the steel after heat treatment reaches the carburizing effect and forms a carburizing layer. This can improve the torsional strength and resistance of the steel Torsion fatigue to stabilize product quality.

本揭露之另一優點就是因為本揭露之鋼材之熱處理方法將淬火處理前之高溫滲碳持溫工序結合至淬火處理中，如此可降低熱處理成本，並可加速生產，且可達到節能減碳之目的。 Another advantage of the disclosure is that the heat treatment method of the disclosed steel combines the high-temperature carburizing and temperature-holding process before the quenching treatment into the quenching treatment, which can reduce the cost of heat treatment, speed up production, and achieve energy saving and carbon reduction Purpose.

本揭露之實施方式已以實施例揭示如上，然其並非用以限定本揭露，熟習此技藝者可在不脫離本揭露之精神和範圍內，做出各種改變、替換、以及變動，因此本揭露之保護範圍當視後附之申請專利範圍所界定者為準。 The embodiments of the present disclosure have been disclosed above with examples, but it is not intended to limit the present disclosure. Those skilled in the art can make various changes, substitutions, and changes without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure The scope of protection shall be determined by the scope of the attached patent application.

100:方法 100: method

120:步驟 120: Step

140:步驟 140: step

160:步驟 160: step

Claims (10)

一種鋼材之熱處理方法，包含： 提供一鋼材，其中該鋼材包含0.1wt%至0.6wt%之碳、矽、錳、鉬、釩、鋁、氮、以及鐵與雜質； 對該鋼材進行一淬火處理，其中進行該淬火處理包含控制該淬火處理之一沃斯田鐵化持溫階段之一保護氣氛之一碳勢為0.6%至1.5%；以及 對該鋼材進行一回火處理。 A heat treatment method for steel, comprising: Provide a steel product, wherein the steel product contains 0.1wt% to 0.6wt% of carbon, silicon, manganese, molybdenum, vanadium, aluminum, nitrogen, and iron and impurities; Carrying out a quenching treatment on the steel material, wherein performing the quenching treatment includes controlling a carbon potential of a protective atmosphere in the temperature-holding stage of Wostian ironization in the quenching treatment to 0.6% to 1.5%; and The steel is subjected to a tempering treatment. 如請求項1所述之鋼材之熱處理方法，其中該鋼材包含一碳鋼材料或一合金鋼材料。The heat treatment method for steel according to claim 1, wherein the steel comprises a carbon steel material or an alloy steel material. 如請求項1所述之鋼材之熱處理方法，其中進行該淬火處理包含在該鋼材之一表面形成一滲碳層。The heat treatment method for steel according to claim 1, wherein performing the quenching treatment includes forming a carburized layer on a surface of the steel. 如請求項3所述之鋼材之熱處理方法，其中進行該淬火處理所形成之該滲碳層之一厚度為10µm至5mm。The heat treatment method for steel according to claim 3, wherein the carburized layer formed by the quenching treatment has a thickness of 10 µm to 5 mm. 如請求項1所述之鋼材之熱處理方法，其中該保護氣氛中之一碳勢氣氛包含一氧化碳、甲烷、丙烷、或其任意組合。The heat treatment method for steel according to claim 1, wherein a carbon potential atmosphere in the protective atmosphere includes carbon monoxide, methane, propane, or any combination thereof. 一種鋼材之熱處理方法，包含： 提供一鋼材，其中該鋼材包含0.1wt%至0.6wt%之碳、矽、錳、鉬、釩、鋁、氮、以及鐵與雜質； 對該鋼材進行一淬火處理，以將該鋼材升溫至一沃斯田鐵化溫度並持溫一段時間，其中在該沃斯田鐵化溫度下持溫時包含控制一保護氣氛，以在該鋼材之一表面形成一滲碳層，該滲碳層之一厚度為10µm至5mm；以及 對該鋼材進行一回火處理。 A heat treatment method for steel, comprising: Provide a steel product, wherein the steel product contains 0.1wt% to 0.6wt% of carbon, silicon, manganese, molybdenum, vanadium, aluminum, nitrogen, and iron and impurities; Carrying out a quenching treatment to the steel, so as to raise the temperature of the steel to a Worthian ironization temperature and hold the temperature for a period of time, wherein the holding temperature at the Worthian ironization temperature includes controlling a protective atmosphere, so that the steel A carburized layer is formed on one of the surfaces, and one of the carburized layers has a thickness of 10 µm to 5 mm; and The steel is subjected to a tempering treatment. 如請求項6所述之鋼材之熱處理方法，其中該鋼材包含一碳鋼材料或一合金鋼材料。The heat treatment method for steel according to claim 6, wherein the steel comprises a carbon steel material or an alloy steel material. 如請求項6所述之鋼材之熱處理方法，其中在該鋼材之該表面形成該滲碳層包含控制該保護氣氛之一碳勢為0.6%至1.5%。The heat treatment method for steel according to claim 6, wherein forming the carburized layer on the surface of the steel includes controlling the carbon potential of the protective atmosphere to 0.6% to 1.5%. 如請求項8所述之鋼材之熱處理方法，其中形成該滲碳層包含控制該保護氣氛之該碳勢為0.8%。The heat treatment method for steel as claimed in claim 8, wherein forming the carburized layer includes controlling the carbon potential of the protective atmosphere to 0.8%. 如請求項8所述之鋼材之熱處理方法，其中該保護氣氛中之一碳勢氣氛包含一氧化碳、甲烷、丙烷、或其任意組合。The heat treatment method for steel according to claim 8, wherein a carbon potential atmosphere in the protective atmosphere includes carbon monoxide, methane, propane, or any combination thereof.
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