JPS60128256A - Method for hardening surface of vane - Google Patents

Abstract

PURPOSE:To prevent partial wear of a cast steel vane by coating the part of the vane where hard fine particles collide with a hard Co-Cr-W-Fe-C alloy and subjecting the entire part of the vane to a hard Cr plating treatment. CONSTITUTION:The vane of an exhauster in a coal thermal power plant is worn and damaged by the collision of the flyashes of the hard particles in waste gas. The part of the front edge 1b of a cast steel vane 1 where the flyashes collide most is finished by multi-layer building-up of a hard Co-Cr-W-Fe-C alloy contg. 8-17% W+C, 25-32% Cr, <5% Fe and some Ni, Mo, Si and the balance Co in order to prevent the above-mentioned wear and damage. A hard Cr plating or Ni-Cr plating layer 2 having >900Hv hardness is formed to >=0.1mm. thickness over the entire surface or the front edge 1b of the vane 1. The wear of the vane of the exhauster by the flyashes is considerably decreased and the service life thereof is largely extended.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は摩耗性を肩する微粒子を含むガスを取扱う細流
機械の耐摩耗性興に係９、特に石炭火カプラ／ト用の排
１ｉ１Ｌ［のような耐アッシュエロージヨン性の必要な
軸流慎械に好適な耐摩耗性翼の表面硬化法に関するもの
でおる。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to improving the wear resistance of a trickle machine that handles gas containing fine particles that have abrasive properties, and in particular to improving the wear resistance of a trickle machine that handles gas containing fine particles that have abrasive properties, and particularly relates to the improvement of the The present invention relates to a surface hardening method for wear-resistant blades suitable for axial flow machines that require ash erosion resistance.

〔発明の背景〕[Background of the invention]

石炭火力プラントにおける排風機は、フライアッシュを
含んだボイラからの燃焼排ガスを取扱うため、このフラ
イアッシュによシ流路部分は摩耗するが、特に尚速で回
転する−の摩れがはなはだしくなる。この真の摩耗状況
を、例えば第１図および第２図に示す細流ファンの動興
について説明する。Since the exhaust fan in a coal-fired power plant handles combustion exhaust gas from the boiler containing fly ash, the fly ash causes wear on the flow path portion, and especially when the fan rotates at high speed, the wear is particularly severe. This true wear situation will be explained, for example, with respect to the movement of the trickle fan shown in FIGS. 1 and 2.

矢印Ｘ方向に流れるガス中のフライアッシュは、尚速で
ｗＪＪ興母材１の前縁部１ａに衝突するので、この前縁
部１ａが最も激しく摩耗する。同図の破線ｆａｔおよび
実に＄ｌａｇ　は前縁部１ａの摩耗前およびＭ読後の形
状をそれぞれ示す。そして、前縁部１ａの摩耗によシ、
翼形状が損傷するとファンの流体性能が低下し、プラン
トの連転に重大な支障を招くので、前縁部１ａの耐摩耗
性を同上させて寿命の延命金はかる心安がるる。The fly ash in the gas flowing in the direction of the arrow X collides with the front edge 1a of the wJJ base material 1 at high speed, so this front edge 1a is worn most severely. The broken line fat and the dotted line $lag in the same figure show the shape of the leading edge portion 1a before wear and after reading M, respectively. Then, due to the wear of the front edge portion 1a,
If the blade shape is damaged, the fluid performance of the fan will deteriorate, causing a serious problem in the continuous operation of the plant, so it is possible to extend the life of the fan by increasing the wear resistance of the leading edge portion 1a.

また、翼表面は溶射などの表面硬化処理により梨子地と
なっているため、フライアッシュの付着全防止できない
ばかりでなく、流体性能も良好でない欠点がおった。竹
にフライアッシュ付着に対してなんら防止策が考ｗ、ぜ
れていないため、そのフライアッシュ付層により流体性
能がさらに低下するばかシでなく、フライアッシュ中に
言まれる成分によシ興表面を腐艮する恐れかめる。この
ように翼の摩耗と翼表面に付着したフライアッシュに基
因する流体性能のは下のため、短期間に保守。Furthermore, since the blade surface has a pear-like finish due to surface hardening treatment such as thermal spraying, it is not only impossible to prevent fly ash from adhering completely, but also the fluid performance is not good. Since no measures have been taken to prevent fly ash from adhering to bamboo, there is no risk that the fluid performance will further deteriorate due to the fly ash adhesion layer, but rather that it may be caused by the ingredients in the fly ash. There is a risk of rotting the surface. In this way, maintenance is required in a short period of time due to poor fluid performance due to blade wear and fly ash adhering to the blade surface.

点検を行わねばならない欠点がめった。There were very few defects that required inspection.

〔発明の目的〕[Purpose of the invention]

本発明は上記従来の諸欠点を解消し、耐アッシュエロー
ジヨン性に曖れ、かつ寿命を長く保持できる耐摩耗性興
の表面硬化法を提供することを目的とするものである。The object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a surface hardening method that improves abrasion resistance, which has poor ash erosion resistance and can maintain a long service life.

〔発明の概要〕[Summary of the invention]

本発明は上記−「りを達成するために、前縁部が’　Ｃ
ｏ−Ｃｒ−Ｗ−ｐｅ−ｃ系硬質合金で形成され、摩耗性
を有する微粒子を含むガスを取扱う軸流機械の耐摩耗性
翼において、前記硬質合金は重量比で（Ｗ＋Ｃ）を８〜
１７チ、Ｃを２５〜３２％、Ｆｅを５−以下、Ｎｉ、Ｍ
ｏおよび８１を若干量含有し、残部がＣｏの成分組成〃
・らなシ、萬の全表面または前記摩耗性微粒子の当る表
面にクロムメッキまたはニッケルークロムメッキを施す
ことを特徴とするものである。In order to achieve the above-mentioned feature, the present invention provides that the leading edge is
In a wear-resistant blade of an axial flow machine that is formed of an o-Cr-W-pe-c hard alloy and handles gas containing abrasive particles, the hard alloy has a weight ratio of (W+C) of 8 to 8.
17%, C 25-32%, Fe 5- or less, Ni, M
Component composition containing a small amount of O and 81, and the remainder being Co.
- It is characterized by applying chromium plating or nickel-chromium plating to the entire surface of the ring or the surface that is in contact with the abrasive particles.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の実施例を図面について説明する。 Embodiments of the present invention will be described below with reference to the drawings.

＠２図は不発明に係わる表面硬化法を通用した翼の１＃
？面図でめる。同図において、１は鋳鋼製萬母体で、こ
の興母坏１の創縁部１ｂはＣｏ−Ｃｒ−Ｗ−Ｆｅ−Ｃ糸
硬ＪＸ−８″金を多ノーに肉盛して仕上成形されておシ
、この鋏＊付金は重量比でＣｒを３１％、ＶＶを１２チ
、ｐｅを４チ、Ｃを２チそれぞれ含有すると共に、その
他にＭｎ＊　Ｍｏおよび８ｉを若干量含有し、残部が０
０からなる００基付金である。このような成分組成の謔
母Ｋｌの表面２にＣｒメッキ（メッキ層の硬さＨｖ　：
　１０５０）を施し、このメッキ層表面をパフ研屋し、
その表面粗さをＲ，ｍａ）（＝　２．５μｍとしたもの
でるる。@Figure 2 is 1# of a blade using the uninvented surface hardening method.
? Draw a surface drawing. In the same figure, reference numeral 1 is a cast steel base body, and the wound edge 1b of this base base 1 is finished by overlaying Co-Cr-W-Fe-C thread hard JX-8'' gold. By weight, this scissor * clasp contains 31% Cr, 12 inches of VV, 4 inches of PE, and 2 inches of C, and also contains a small amount of Mn* Mo and 8i. 0 remaining
It is a 00 fund consisting of 0. Cr plating (hardness of the plating layer Hv:
1050), and the surface of this plating layer is subjected to a puff polishing process.
The surface roughness is R, ma) (= 2.5 μm).

このように構成した翼の耐摩耗性は、一般に硬さが高く
なるに伴って向上するといわれているが、フライアッシ
ュに対する摩耗状況は棄なる。すなわち、流体中に含ま
れるフライアッシュは５ｉ０２を主成分とし、原料炭の
種類によりＡ４０３などが混入されているから非冨Ｖｃ
硬い微粒子である。It is generally said that the wear resistance of blades constructed in this manner improves as the hardness increases, but the wear resistance against fly ash is poor. In other words, the fly ash contained in the fluid is mainly composed of 5i02 and contains A403 etc. depending on the type of coking coal, so it is non-rich Vc.
They are hard particles.

上記微粒子が翼に衝突する様子を第４図に示す。FIG. 4 shows how the particles collide with the blade.

その硬い微粒子は、翼先端付近では興に対する角度θｌ
が大きい角度（９０°に近い角度）で、翼先端以外の部
分では同角度θ２が小さい角度でそれぞれ衝突する。−
服に、粒子が物体に衝突する角度θと摩耗量との関係を
図示すると紀５図のとおシでるる。図中の曲線Ｃ，，ｌ
）、＆よ、候さが同一で、じん性の異なる二物体Ｃ，Ｄ
の特性をそれぞれ示す。この図からじん性の尚い物体Ｃ
では、角度θが２０〜４０度の点Ｅで最大摩耗量を示し
、一方、じん性の低い物体りでは、角度θが９０度の点
Ｆで最大ノψ札証を示していることが判る。The hard particles have an angle θl with respect to the plane near the tip of the blade.
is a large angle (approximately 90°), and the same angle θ2 is small in parts other than the blade tips. −
The relationship between the angle θ at which particles collide with an object and the amount of wear on clothes is shown in Figure 5. Curves C,,l in the figure
), &yo, two objects C and D with the same weather but different toughness
The characteristics of each are shown. From this figure, a less tough object C
It can be seen that the maximum wear amount is shown at point E where the angle θ is 20 to 40 degrees, while the maximum wear amount is shown at point F where the angle θ is 90 degrees for objects with low toughness. .

その理由は、物体Ｃではθが２０〜４０度の範囲におい
て、微粒子が物体Ｃをアブレーシブに削シ取ることが多
いためであり、θが９０１ｉ付近になると、物体りは塑
性策形を生じて摩耗するのが少ないからである。Ｉた、
他方の物体りではθが９０度付近になると、その物体り
はじん性が低いため、塑性変形を生じないから脆性破壊
によシ摩耗量が多くなる。ところが、θが低い狽域では
、逆に塑性変形ケ生じないから摩耗量は諷少するからで
ある。The reason for this is that fine particles often abrasively abrade object C when θ is in the range of 20 to 40 degrees, and when θ is around 901i, the object becomes plastically shaped. This is because there is less wear. I,
For the other object, when θ is around 90 degrees, that object has low toughness and does not undergo plastic deformation, so the amount of wear increases due to brittle fracture. However, in the stiff region where θ is low, no plastic deformation occurs, so the amount of wear decreases.

上記のような特性金考鳳すると、θが９０反付近で多く
の微粒子が衝突する興前縁付近にはじん性の筒い材料を
用い挑の他の部分にはじん性が低くても、硬い材料を用
いるとよい。これを考慮して榎々の材料のＭ耗１ｔｔ−
測定した結果を図示すれば、ｙ、６図のとおりでおる。Considering the above characteristics, a tough cylindrical material is used near the front edge where many particles collide when θ is around 90 antis, and the other parts of the front are made of tough material, even if the toughness is low. It is best to use a hard material. Considering this, the wear of Enoki's materials is 1tt-
The measured results are shown in Figure 6.

この図の摩耗量は、第５図で示した摩耗量の最も＾い角
度の値で比軟したものである。The amount of wear in this figure is compared with the value of the angle at which the amount of wear shown in FIG. 5 is the highest.

第６図のＣｏ：Ｊ５盆金（３）は、夏宣比で、Ｃｒを３
１チ、Ｗを１２％、Ｃを２％、ｐｅを４％、１％１ｎ＋
Ｍｏおよび８ｉを若干量含肩し、残部がＣｏの成分組成
からなム硬さくＨｖ）は６００で、じん性の高いもので
ある。Ｃｏ基曾付会は、Ｗを４優、Ｃｅ１ｑｂ、Ｃｒ、
Ｆｅ、ＭｏおよびＳｉ’ｊ−上記Ｃｏ４０金（４）と同
量とし、残部がＣＯの成分組成からなり、硬さくＨｖ）
は４４０で、がっじん性の尚いものである。また、クロ
ムメッキはメッキ浴成分、温度および電流密度を調櫃し
、硬さＨｖを１０５０としたものである。この図から明
らかなように、＃耗蓋はクロムメッキが敢も少なく、Ｃ
ｏ基曾釡囚、同（ロ）および鉱鋼のノ貝圧に大きくなっ
ている。このように摩耗量から考察すると、クロムメッ
キは雄も少ないが、厚さを大きくとることができないた
め、興ＮｉＪ縁部としては適当でない。Co:J5 Bonkin (3) in Figure 6 is Natsunobi and has 3 Cr.
1chi, 12% W, 2% C, 4% pe, 1%1n+
Since it contains a small amount of Mo and 8i, and the remainder is Co, it has a hardness (Hv) of 600, and has high toughness. Co Kisozukekai has 4 Ws, Ce1qb, Cr,
Fe, Mo and Si'j - the same amount as the above Co40 gold (4), with the remainder consisting of CO, hardness Hv)
It has a rating of 440, which is extremely strong. Further, the chromium plating was made to have a hardness Hv of 1050 by adjusting the plating bath components, temperature and current density. As is clear from this figure, the chrome plating on the # wear lid is intentionally low, and the C
The pressure on the mining and steel industry is increasing. Considering the amount of wear as described above, chrome plating has a small amount of wear, but it cannot be made thicker, so it is not suitable for forming NiJ edges.

前記第３図に示した実施例は、翼全面にクロムメッキを
施したが、歳も摩耗のはなはだしい翼前縁部はクロムメ
ッキたけでは厚さが不十分である。In the embodiment shown in FIG. 3, the entire surface of the blade is plated with chrome, but the thickness of the leading edge of the blade, which is subject to significant wear over time, is insufficient with just the chrome plating.

そこで、翼前縁部を本発明のＣｏ基合金囚で構成すれば
、摩耗防止の効果を向上させることができる。一方、Ｃ
ｏ基合金■は、硬さが低く、かつ耐摩耗性が良好でない
。これは、Ｃｏ基合金中のＷとＣの含有量に差を生ずる
ためである。すなわち、Ｗ、ＣｒとＣは非常に硬い炭化
物を作るが、この炭化物の量は（Ｗ十〇）菫により左右
される。Therefore, if the leading edge portion of the blade is made of the Co-based alloy prisoner of the present invention, the effect of preventing wear can be improved. On the other hand, C
O-based alloy (2) has low hardness and poor wear resistance. This is because there is a difference in the content of W and C in the Co-based alloy. That is, W, Cr, and C form a very hard carbide, but the amount of this carbide depends on (W10) violet.

また、ＣｒＪｉはじん性を確保するために、２５〜３２
チの範囲にすると効果が大でめる。In addition, in order to ensure the toughness of CrJi, 25 to 32
If you set it within the range of 1, you can get a great effect.

上記Ｃｏ基合金中の（Ｗ十〇）量と摩れ量との関係は、
第７図に示すとおシである。この図から明らかなように
、（Ｗ十〇）賞が８チ（ｗｔ）以下になると、硬さは低
下するから摩耗量は増大する。また、（ｗ＋ｃ）ｉが１
７％（ｗｔ）を超えると、硬さが向上すると同時に、じ
ん性は低下するから摩耗量が再び増加する。したがって
（Ｗ、十Ｃ）量は８〜１７％（ｗｔ）の範囲にするのが
最適である。The relationship between the amount of (W10) in the above Co-based alloy and the amount of wear is as follows:
This is shown in FIG. As is clear from this figure, when the (W10) value becomes 8 inches (wt) or less, the hardness decreases and the amount of wear increases. Also, (w+c)i is 1
If it exceeds 7% (wt), the hardness improves but at the same time the toughness decreases, so the amount of wear increases again. Therefore, it is optimal that the amount of (W, 10C) is in the range of 8 to 17% (wt).

第３図および第６図におけるクロムメッキの硬式（Ｈｖ
）は１０５０であるが、このクロムメッキの硬さはメッ
キ浴の組成、温度および電流によって異な９、このクロ
ムメッキの硬さにょシ摩れ菫も変化する。第８図はその
クロムメッキの硬さと摩耗量との関係を示したものでる
る。この図からクロムメッキの硬さくＨｖ）が９００以
下および９００以上であると、摩耗量はそれぞれ増大お
よび減少することが明らかである。クロムメッキは、そ
の条件を変化させても、その硬さくＨｖ）を１２００以
上にすることができない。したがって、クロムメッキの
硬１（Ｈｖ）は９００以上であれば、耐摩耗の効果を認
めることができる。Hard chrome plating (Hv) in Figures 3 and 6
) is 1050, but the hardness of this chrome plating varies depending on the composition of the plating bath, temperature, and electric current. Figure 8 shows the relationship between the hardness of the chrome plating and the amount of wear. From this figure, it is clear that when the hardness (Hv) of the chrome plating is 900 or less and 900 or more, the amount of wear increases and decreases, respectively. Even if the conditions of chrome plating are changed, the hardness (Hv) cannot be increased to 1200 or higher. Therefore, if the hardness 1 (Hv) of chrome plating is 900 or more, the wear-resistant effect can be recognized.

一方、クロムメッキまたはニッケルクロムメッキ層の厚
さは翼の寿命と関係かめる。すなわち、第６図および第
８図で説明したように、クロムメッキ層は時間の紗過に
伴って４托するため、＠成ファンの足期点検の期間によ
ｐ　０．１　ｔａｎ以上の厚さが必要でおる。On the other hand, the thickness of the chrome plating or nickel chrome plating layer is related to the lifespan of the blade. In other words, as explained in Fig. 6 and Fig. 8, the chromium plating layer becomes thicker over time, so the thickness of p 0.1 tan or more depends on the period of the regular inspection of @Seifan. I need it.

上記のようにして製作した翼は、摩れ視象だけでなく、
軸流７アンの運転条件Ｐよび運転時の気象条件などによ
り、流体中に富まれるフライアッシュが翼表面に付着し
て堆積する恐れがめる。このように付着が−たん生ずる
と、摩れの見地からはよいのでおるが、軸流ファンの流
体性能を低下させるばかシでなく、付Ｎ量が増加すると
、翼間のアンバランスを生じ、振動および騒音の原因と
なる。The wings manufactured as described above not only show wear and tear, but also
Depending on the operating condition P of the axial flow 7 amps and the weather conditions during operation, there is a risk that fly ash, which is rich in the fluid, will adhere to and accumulate on the blade surface. If adhesion occurs in this way, it is good from the standpoint of wear, but it does not only reduce the fluid performance of the axial flow fan, but also causes an imbalance between the blades as the amount of nitrogen increases. Causes vibration and noise.

そこで、翼にクロムメッキを施した後、パフなどにより
クロムメッキの表面を研摩して表向粗さを小さくすると
、フライアッシュの付着は減少する。そのクロックメッ
キの次面粗さとフライアッシュの付着量との関係を図示
すると第９図のようになる。この図よりクロムメッキの
表向粗さが５μｍ以上になると、フライアッシュの付Ｎ
量は急激に増力口するので、前記表面粗さ几Ｉｎａｚを
５μｍ以下にすることによシ、効果の増大をはかること
ができる。Therefore, after applying chrome plating to the blade, if the surface of the chrome plating is polished with a puff or the like to reduce the surface roughness, the adhesion of fly ash will be reduced. The relationship between the surface roughness of the clock plating and the amount of fly ash deposited is shown in FIG. 9. From this figure, when the surface roughness of chrome plating is 5 μm or more, fly ash
Since the amount increases rapidly, the effect can be increased by setting the surface roughness Inaz to 5 μm or less.

上述した本実施例では、翼前縁部のＣｏ−Ｃｒ−Ｗ−Ｐ
ｅ−Ｃ系硬質合金の形成法として、第３図に示すように
肉盛による方法を示したが、不発明はこれに限定されず
、ロー付は法、かしめ法およびビス締付は法によっても
同様な効果をうろことができる。また、クロムメッキは
下地にニッケルメッキと銅メッキ、または銅メッキがあ
っても、クロムメッキ層の厚さが０．１闘以上あると同
様な効果をうることかできる。In this embodiment described above, the Co-Cr-W-P at the leading edge of the wing
As a method of forming e-C hard alloy, as shown in Fig. 3, we have shown a method by overlaying, but the invention is not limited to this. You can also get the same effect. Furthermore, even if chromium plating has nickel plating and copper plating, or copper plating, the same effect can be obtained if the thickness of the chrome plating layer is 0.1 mm or more.

本発明方法および従来法によりそれぞれ製作した翼にお
いて、その摩耗性、フライアッシュの付着量および腐食
の状況をそれぞれ比較して表に示すと第１表のようにな
る。Table 1 shows a comparison of the abrasion properties, amount of fly ash deposited, and corrosion status of blades manufactured by the method of the present invention and the conventional method.

この表より、不発明方法による翼は従来法による翼よシ
も、摩耗、フライアッシュの付着および腐食がそれぞれ
減少していることを容易に理解で゛きる。From this table, it can be easily understood that the blade made by the uninvented method has less wear, fly ash adhesion, and corrosion than the blade made by the conventional method.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、翼の耐アッシュ
エロージヨン性の向上および翼寿舖°の畑長をはかると
共に、翼表面に付着するフライアッシュによる流体性能
の労化および鱈衣面の腐曵ケ防止し、かつ保守・点検の
労力およびコストを大幅に軽減することができる。As explained above, according to the present invention, it is possible to improve the ash erosion resistance of the blade and increase the field length of the blade life, as well as reduce the labor of fluid performance due to fly ash adhering to the blade surface. It is possible to prevent corrosion and greatly reduce the labor and cost of maintenance and inspection.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は＠流ファンの翼前縁部が摩耗した状態を示す側
面図、第２図は第１図のＩＦ−ＩＦ線断面図、第３図は
本発明に係わる興の表面硬化法の一実施例を適用した翼
の断面図、第４図は微粒子の−ｊ突する状態を示す翼断
面図、第５図ないし第９図は本発明の表面硬化法に関す
る説明図でりる。 １・・・翼母体、Ｉａ・・・翼前縁部、１ｂ・・・Ｃｏ
−０ｒ−Ｗ−Ｆｅ−Ｃ糸硬實合金部、２・・・クロムメ
ッキ高１図 ￥１３　図 第４図 ′ｆ１５　口 ０　３０　６０　’ＩＱ カ　４　図 靭性　あ　高　中　高 ￥１７　図 Ｗすｃ　（Ｂシリ 第　δ　図 ２０ムメツキのＭ町ぎ　（Ｈｔｒ） ％’？　ｌ１１ ０　２　４　６　δFig. 1 is a side view showing a worn state of the blade leading edge of the @-flow fan, Fig. 2 is a sectional view taken along the IF-IF line in Fig. 1, and Fig. 3 is a surface hardening method according to the present invention. FIG. 4 is a cross-sectional view of a blade to which one embodiment is applied, FIG. 4 is a cross-sectional view of the blade showing a state in which fine particles are exposed to −j, and FIGS. 5 to 9 are explanatory diagrams regarding the surface hardening method of the present invention. 1... Wing matrix, Ia... Wing leading edge, 1b... Co
-0r-W-Fe-C thread hard alloy part, 2...Chrome plating height 1 figure ¥13 Figure 4 'f15 Mouth 0 30 60 'IQ Ka 4 Figure toughness A High Medium High ¥17 Figure Wsc (B series No. δ Figure 20 M-machi of Mumetsuki (Htr) %'? l11 0 2 4 6 δ

Claims (1)

【特許請求の範囲】 １、前縁部がＣｏ　−Ｃｒ　−Ｗ−Ｆ　ｅ　−Ｃ系候質
合金で形成され、摩耗性を有する微粒子を営むガスを取
扱う軸流機械の耐摩耗性興において、前記硬質合金は重
量比で（Ｗ十〇）’に８〜１７チ、Ｃを２５〜３２９６
．１１１　ｅを５％以下、Ｎｉ。 Ｍ’０および８ｉを若干危言有し、残部がＣｏの成分組
成からなシ、舅の全表面またはｎｆＪ記摩耗性微粒子の
肖る表面にクロムメッキまたは二ツケルークロムメッキ
ヲ施すことを性徴とする翼の表面硬化法。 ２、　上ｉ己りロムメッキｔｖｔｔたけニッケルークロ
ムメッキ層の硬ｔ＜’１）（ｖ　９００以上に、その厚
さケ０．１　ｗｔｍ以上にそれぞれ形紙することを特徴
とするＩ＃詐請求の範囲第１項の翼の表面硬化法。 ふ　上Ｈ己りロム・メッキ１ｍまたはニッケルークロム
メッキ層の表面粗さをＲ，ｍａｚ　＝　５μｍ以下に形
成したことを特徴とする特許請求の範囲第１項または第
２項記載の翼の狭面硬化法。[Scope of Claims] 1. In order to improve the wear resistance of an axial flow machine that handles gas in which the leading edge is formed of a Co-Cr-W-Fe-C alloy and contains abrasive fine particles, The hard alloy has a weight ratio of (W 10)' to 8 to 17 inches and C to 25 to 3296.
．． 5% or less of 111e, Ni. M'0 and 8i are somewhat dangerous, and the remainder is Co, and it is considered a sexual characteristic that chrome plating or two-layer chrome plating is applied to the entire surface of the body or the surface on which nfJ abrasive particles are present. Surface hardening method for blades. 2. I# fraud claim characterized by the hardness of the nickel-chrome plating layer being t<'1) (v 900 or more and the thickness being 0.1 wtm or more). The surface hardening method for blades according to item 1. The scope of claims characterized in that the surface roughness of the 1 m chromium plating layer or the nickel-chromium plating layer is formed to be R, maz = 5 μm or less. 2. A narrow surface hardening method for blades according to item 1 or 2.