JPS646273B2 - - Google Patents
Info
- Publication number
- JPS646273B2 JPS646273B2 JP60255734A JP25573485A JPS646273B2 JP S646273 B2 JPS646273 B2 JP S646273B2 JP 60255734 A JP60255734 A JP 60255734A JP 25573485 A JP25573485 A JP 25573485A JP S646273 B2 JPS646273 B2 JP S646273B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- coating
- film
- laser irradiation
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011248 coating agent Substances 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 239000000758 substrate Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
〔産業上の利用分野〕
本発明は、基体表面に粉体形成被膜を有する鉄
鋼製品の処理方法に関する。
〔従来技術〕
最近の鉄鋼製品の耐食性あるいは耐摩耗性付与
のため、メツキに代わり耐食性あるいは耐摩耗
性、耐熱性のあるCu、Ni、Co、Cr、Ti、Mo等
の金属、これらの合金又は酸化物を溶射する方法
が行われている。
ところで、溶射は粉体を溶融して液状として基
材に付着させて被膜を形成するという方法で密着
性に優れた方法であるが、これに代わり密着性は
若干劣るものの、非常に簡便に耐食性、耐摩耗性
を得る方法として、粉体を直接基材に塗布する方
法がある。
これは上記した金属及びそれらの合金あるいは
酸化物の粉体を液状の樹脂系塗料又はアルコール
等の液体に混合し、液体の濡れ付着性を利用して
基材に付着させて被膜を形成するものである。し
かし、このようにして形成された被膜は粉末粒子
間が固化した液体で結合された状態であるに過ぎ
ないために、気孔が存在しやすく、クラツク等の
欠陥が発生しやすい。これらの欠陥をなくすため
に、手段の一つとして、レーザー照射により粉体
を少なくとも部分的に溶融結合させる方法がとら
れる。
ところが、かかる粉体塗布被膜のレーザー照射
により溶融した被膜の冷却速度は約1000℃／sec
と非常に速く、素材の加熱後のマルテンサイト変
態による硬化とともに表面状態の劣化という問題
があり、この熱影響を少なくするためにレーザー
照射に当たつて350℃以上の温度で予熱が行われ
る。
〔発明が解決しようとする問題点〕
この予熱を行いながらレーザー照射を行う方法
によつては、一方においては粉体被膜の凝固の際
のワレ等を防止することができるが、素材との希
釈により被膜自体の硬度を低下させてしまうとい
う欠点がある。
すなわち、形成被膜が有する耐摩耗性を低下さ
せることになる。
本発明は、粉体を用いて形成された被膜にレー
ザーを照射することによる上記の問題点を解消す
ることによつて、基材と被膜が本来的に有する特
性の低下を回復するとともに、被膜そのものの特
性を向上せしめることを目的とする。
〔問題点を解決するための手段〕
上記本発明の目的は、レーザー照射によつて溶
解した後の被膜を特定の温度で加熱することによ
つて達成することができる。
レーザー照射によつて溶融した被膜が凝固した
後、形成された被膜とそれに接する鋼材表面はそ
れぞれに合金元素を相互に浸透せしめ、互いに特
性を発揮させるために必要とする以外の元素を過
飽和に固溶した不安定な結晶状態にある。
従つて、レーザー照射によつてヒユージングし
た被膜を加熱することによつて、基材からの元素
を固溶した金属間化合物、炭化物を粒間に析出せ
しめて被膜の硬度を回復せしめることができる。
レーザー照射後の加熱温度は厳密には粉体形成
被膜の材質あるいは基材にもよるが、400〜700℃
の温度範囲に加熱することによつて、充分に粉体
形成被膜の硬度を回復させることが可能である。
又そのための加熱時間は粉体形成被膜が均一に
加熱されれば良く、余り長くなると粒界に析出し
た金属間化合物、炭化物が粉体溶融層中に再固溶
して再び硬度の低下を起こすことになる。
また、上記後加熱によつて、レーザー照射によ
る劣化した基体の熱影響部の靭性も回復する。
〔実施例〕
長さ1000mm、巾500mm、厚さ10mmの寸法の鋼板
表面をシヨツトブラストにより清浄化した後、こ
れに第１表に示す組成の粉体合金を静置添加によ
り500μｍの厚さに被覆した。
[Industrial Field of Application] The present invention relates to a method for treating steel products having a powder-forming coating on the surface of a substrate. [Prior art] In order to impart corrosion resistance or wear resistance to recent steel products, instead of plating, metals such as Cu, Ni, Co, Cr, Ti, Mo, etc., which have corrosion resistance, wear resistance, and heat resistance, or their alloys or A method of thermal spraying oxides has been used. By the way, thermal spraying is a method that has excellent adhesion by melting powder and applying it to the base material as a liquid to form a coating. As a method of obtaining wear resistance, there is a method of applying powder directly to a base material. This is a method in which powders of the above-mentioned metals and their alloys or oxides are mixed with a liquid resin paint or a liquid such as alcohol, and the mixture is applied to a substrate using the wettability of the liquid to form a film. It is. However, since the film formed in this manner is simply a state in which powder particles are bonded together by solidified liquid, pores are likely to exist and defects such as cracks are likely to occur. In order to eliminate these defects, one method is to at least partially melt and bond the powder by laser irradiation. However, the cooling rate of the powder coated film melted by laser irradiation is approximately 1000°C/sec.
After heating the material, it hardens due to martensitic transformation and deteriorates the surface condition.To reduce this thermal effect, preheating is performed at a temperature of 350°C or higher before laser irradiation. [Problems to be solved by the invention] This method of laser irradiation while performing preheating can, on the one hand, prevent cracking during solidification of the powder coating, but it can also prevent dilution with the material. This has the disadvantage of reducing the hardness of the coating itself. In other words, the wear resistance of the formed film is reduced. The present invention solves the above-mentioned problems caused by irradiating a coating formed using powder with a laser, thereby recovering the deterioration of the characteristics inherent in the base material and the coating, and improving the coating. The purpose is to improve the characteristics of the object. [Means for Solving the Problems] The above object of the present invention can be achieved by heating the coating at a specific temperature after being melted by laser irradiation. After the coating melted by laser irradiation solidifies, the formed coating and the steel surface in contact with it are allowed to penetrate each other with alloying elements, and solidify to supersaturation of elements other than those required for each other to exhibit their properties. It is in a dissolved, unstable crystalline state. Therefore, by heating the fused film by laser irradiation, intermetallic compounds and carbides containing elements from the base material as a solid solution can be precipitated between the grains, thereby restoring the hardness of the film. Strictly speaking, the heating temperature after laser irradiation is 400 to 700℃, depending on the material of the powder forming film or the base material.
It is possible to sufficiently restore the hardness of the powder-formed coating by heating to a temperature range of . In addition, the heating time for this purpose is sufficient as long as the powder-formed coating is heated uniformly; if the heating time is too long, the intermetallic compounds and carbides precipitated at the grain boundaries will be re-dissolved in the molten powder layer, causing a decrease in hardness again. It turns out. Furthermore, the post-heating also restores the toughness of the heat-affected zone of the substrate that has deteriorated due to laser irradiation. [Example] After cleaning the surface of a steel plate with dimensions of 1000 mm in length, 500 mm in width, and 10 mm in thickness by shot blasting, a powder alloy having the composition shown in Table 1 was added to the plate at rest to a thickness of 500 μm. coated with.
本発明によつて、粉体形成被膜の基体への接着
性の向上と形成被膜の特性の向上という本来的に
有するレーザー照射の機能を充分に達成すること
ができ、粉体被膜の剥離性、割れ性がなく充分な
強度を有する被膜形成体を得ることができる。
According to the present invention, the inherent functions of laser irradiation, such as improving the adhesion of the powder-formed film to the substrate and improving the properties of the formed film, can be fully achieved, and the peelability of the powder-forming film can be improved. It is possible to obtain a film-formed body that is not susceptible to cracking and has sufficient strength.
添付図はレーザー照射後の加熱による粉体形成
被膜と基体の熱影響部の性質の回復状態を示す。
第１図は粉体形成被膜の回復状態を、又第２図は
基体の熱影響部の性質の回復状態を示す図であ
る。
The attached figure shows the state of recovery of the properties of the powder-formed coating and the heat-affected zone of the substrate by heating after laser irradiation.
FIG. 1 shows the state of recovery of the powder-formed coating, and FIG. 2 shows the state of recovery of the properties of the heat-affected zone of the substrate.
Claims (1)
同基体を350℃以上の温度に保持しつつ、前記被
膜にレーザー照射を行つて該被膜材を融点以上の
温度に加熱し、鋼基体と前記被膜とをその界面部
において融着せしめた後、200〜700℃の温度に加
熱し冷却することを特徴とする粉体形成被膜の硬
度回復方法。1 Apply powder to the surface of the steel base to form a film,
While maintaining the base at a temperature of 350° C. or higher, the coating is irradiated with a laser to heat the coating material to a temperature higher than its melting point, and the steel base and the coating are fused at the interface thereof, and then A method for recovering the hardness of a powder-formed coating, which comprises heating to a temperature of 200 to 700°C and cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60255734A JPS62116784A (en) | 1985-11-13 | 1985-11-13 | Method for restoring hardness of film formed of powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60255734A JPS62116784A (en) | 1985-11-13 | 1985-11-13 | Method for restoring hardness of film formed of powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62116784A JPS62116784A (en) | 1987-05-28 |
| JPS646273B2 true JPS646273B2 (en) | 1989-02-02 |
Family
ID=17282887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60255734A Granted JPS62116784A (en) | 1985-11-13 | 1985-11-13 | Method for restoring hardness of film formed of powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62116784A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108263302A (en) * | 2017-12-18 | 2018-07-10 | 合肥亿恒智能科技股份有限公司 | A kind of vehicle complete vehicle controller lower carriage |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390304C (en) * | 2002-11-28 | 2008-05-28 | 中国科学院力学研究所 | Laser Toughening Method of Interface Between Metal Substrate and Coating Layer |
| JP5487376B2 (en) * | 2012-02-28 | 2014-05-07 | 富士高周波工業株式会社 | Laser cladding method and tool material |
| JP2025154023A (en) * | 2024-03-29 | 2025-10-10 | 三菱製鋼株式会社 | Stainless steel manufacturing method and stainless steel |
-
1985
- 1985-11-13 JP JP60255734A patent/JPS62116784A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108263302A (en) * | 2017-12-18 | 2018-07-10 | 合肥亿恒智能科技股份有限公司 | A kind of vehicle complete vehicle controller lower carriage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62116784A (en) | 1987-05-28 |
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