CN105331786A - Negative temperature gradient solid solution heat treatment method of PH17-4 precipitation-hardening stainless steel - Google Patents
Negative temperature gradient solid solution heat treatment method of PH17-4 precipitation-hardening stainless steel Download PDFInfo
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Abstract
The invention discloses a negative temperature gradient solid solution heat treatment method of PH17-4 precipitation-hardening stainless steel, relates to the solid solution heat treatment method of PH17-4 precipitation-hardening stainless steel, and aims to solve the technical problems that the conventional PH17-4 precipitation-hardening stainless steel subjected to solid solution heat treatment is low in load and poor in comprehensive mechanical property. The method comprises the steps of heating PH17-4 precipitation-hardening stainless steel; carrying out solid solution treatment under the negative temperature time gradient condition; naturally cooling in air to the room temperature; carrying out ageing treatment; and naturally cooling in air to the room temperature. The invention has the advantages that compared with a traditional heat treatment technology, the method has the advantage that the comprehensive mechanical property of the PH17-4 steel treated through the method is obviously improved; the matching of steel strength and steel plasticity can be adjusted in a quite large range through changing the parameters of the heat treatment technology, so that different requirements are met; and the method is applied to heat treatment of PH17-4 precipitation-hardening stainless steel.
Description
Technical field
The present invention relates to a kind of PH17-4 PH Stainless Steel solid solution heat treatment method.
Background technology
PH Stainless Steel is growth requirement in order to adapt to aerospace cause and the class high-strength steel grown up, it is a kind of Fe-Cr-Ni alloy, by adding the elements such as Nb, Mo, Al, V, N, separate out precipitation phase by ageing treatment and put forward heavy alloyed intensity and toughness, its over-all properties is stablized.Widely, as primary load bearing components such as Nuclear power plants stem member, bearing, undercarriages, field relates to chemical industry, space flight and aviation, the energy, oil, papermaking etc. in PH17-4 PH Stainless Steel application wherein.
At present, the conventional thermal treatment process of PH Stainless Steel is mainly solution treatment+ageing treatment.PH Stainless Steel, after solid solution and ageing treatment, can obtain good intensity and plasticity.In theory, for the material with Precipitation behavior, the kind of precipitated phase, pattern, size and distribution situation etc. can be controlled by fixation rates, regulate its over-all properties.Due to further developing of aerospace cause, for the load-carrying member requiring high-load, high comprehensive mechanical property, this over-all properties needs to be improved further.Therefore be necessary to explore the New Technology of Heat Treatment improving PH17-4 steel comprehensive mechanical property.
Summary of the invention
The present invention is to solve the existing technical problem that PH17-4 PH Stainless Steel load is low, comprehensive mechanical property is poor through solution heat treatment, and provides a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method.
A kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method of the present invention carries out according to the following steps:
PH17-4 PH Stainless Steel is heated to 1000 DEG C ~ 1200 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.3 DEG C/min ~ 1 DEG C/min cooling 40min ~ 120min.
PH17-4 PH Stainless Steel of the present invention is 0Cr17Ni4Cu4Nb steel.
Advantage of the present invention:
Tensile strength through the PH17-4 steel of negative temperature gradient solution heat treatment of the present invention reaches 1385MPa ~ 1450MPa, yield strength reaches 1259MPa ~ 1330MPa, unit elongation is 11.7% ~ 14.6%, relative reduction in area is 60.3% ~ 64.6%, compare with conventional solid solution and aging thermal treating process, tensile strength can improve about 40MPa, and yield strength can improve 60MPa at most, and unit elongation can improve about 2%.
Comprehensive mechanical property through the PH17-4 steel of process of the present invention is significantly improved than prior heat treatment process, and the parameter simultaneously changing this thermal treatment process in very large range can regulate the cooperation of the strong plasticity of steel, to meet the different needs.
Accompanying drawing explanation
Fig. 1 is the process schematic representation of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method of the present invention, 1 process for PH17-4 PH Stainless Steel to be heated to 1000 DEG C ~ 1200 DEG C from room temperature, 2 for carrying out the process of solution treatment under the condition of negative temperature time gradient, 3 for naturally cooling to the process of room temperature in atmosphere, 4 is the process from room temperature to 480 DEG C, 5 for be incubated the process that 4h carries out ageing treatment under temperature is the condition of 480 DEG C, and 6 is the process naturally cooling to room temperature in atmosphere;
Fig. 2 is the metallographic structure photo of the PH17-4 steel of negative temperature gradient solution heat treatment through testing one;
Fig. 3 is the metallographic structure photo of 17-4PH stainless steel after the 1h conventional solid solution process of 1040 DEG C.
Embodiment
Embodiment one: present embodiment is a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method, specifically carries out according to the following steps:
PH17-4 PH Stainless Steel is heated to 1000 DEG C ~ 1200 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.3 DEG C/min ~ 1 DEG C/min cooling 40min ~ 120min.
Embodiment two: the difference of present embodiment and embodiment one is: PH17-4 PH Stainless Steel is heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 1 DEG C/min cooling 40min.Other are identical with embodiment one.
Embodiment three: the difference of present embodiment and embodiment one or two is: PH17-4 PH Stainless Steel is heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.67 DEG C/min cooling 60min.Other are identical with embodiment one or two.
Embodiment four: the difference of present embodiment and embodiment one to three is: PH17-4 PH Stainless Steel is heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.34 DEG C/min cooling 60min.Other are identical with embodiment one to three.
Embodiment five: the difference of present embodiment and embodiment one to four is: PH17-4 PH Stainless Steel is heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.5 DEG C/min cooling 60min.Other are identical with embodiment one to four.
By following verification experimental verification beneficial effect of the present invention:
Test one: this test is a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method, specifically carries out according to the following steps:
PH17-4 PH Stainless Steel is heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 1 DEG C/min cooling 40min.
The PH17-4 steel tensile strength of the negative temperature gradient solution heat treatment through testing is 1450MPa, and yield strength is 1330MPa, and unit elongation reaches 12.61%, has good intensity index.
Fig. 2 is the metallographic structure photo of the PH17-4 steel of negative temperature gradient solution heat treatment through testing one, Fig. 3 is the metallographic structure photo of 17-4PH stainless steel after the 1h conventional solid solution process of 1040 DEG C, can find out compared with normative heat treatment technique through contrast, the negative temperature gradient solid solution heat treatment method of test one can thinning microstructure.
Test two: this test is a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method, specifically carries out according to the following steps:
PH17-4 PH Stainless Steel is heated to 1040 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.34 DEG C/min cooling 60min.
The PH17-4 steel tensile strength of the negative temperature gradient solution heat treatment through testing is 1393MPa, and yield strength is 1267MPa, and unit elongation reaches 14.64%, has good plasticity index.
Claims (5)
1. a PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method, is characterized in that PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method carries out according to the following steps:
PH17-4 PH Stainless Steel is heated to 1000 DEG C ~ 1200 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.3 DEG C/min ~ 1 DEG C/min cooling 40min ~ 120min.
2. a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method according to claim 1, PH17-4 PH Stainless Steel is it is characterized in that to be heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 1 DEG C/min cooling 40min.
3. a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method according to claim 1, PH17-4 PH Stainless Steel is it is characterized in that to be heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.67 DEG C/min cooling 60min.
4. a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method according to claim 1, PH17-4 PH Stainless Steel is it is characterized in that to be heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.34 DEG C/min cooling 60min.
5. a kind of PH17-4 PH Stainless Steel negative temperature gradient solid solution heat treatment method according to claim 1, PH17-4 PH Stainless Steel is it is characterized in that to be heated to 1060 DEG C from room temperature, then under the condition of negative temperature time gradient, solution treatment is carried out, naturally cool to room temperature in atmosphere, again from room temperature to 480 DEG C, be be incubated 4h under the condition of 480 DEG C to carry out ageing treatment in temperature, naturally cool to room temperature in atmosphere, namely complete the solution heat treatment of PH17-4 PH Stainless Steel negative temperature gradient;
The step of carrying out solution treatment under the condition of described negative temperature time gradient is: with the speed of 0.5 DEG C/min cooling 60min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108942120A (en) * | 2018-09-10 | 2018-12-07 | 中石化四机石油机械有限公司 | A kind of material and manufacturing process of throttle valve stem |
| CN115415524A (en) * | 2022-08-29 | 2022-12-02 | 苏州中耀科技有限公司 | Sintering method of 17-4PH stainless steel MIM (metal-insulator-metal) part |
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| CN115415524A (en) * | 2022-08-29 | 2022-12-02 | 苏州中耀科技有限公司 | Sintering method of 17-4PH stainless steel MIM (metal-insulator-metal) part |
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Application publication date: 20160217 |