JPH0243821B2 - - Google Patents
Info
- Publication number
- JPH0243821B2 JPH0243821B2 JP60096517A JP9651785A JPH0243821B2 JP H0243821 B2 JPH0243821 B2 JP H0243821B2 JP 60096517 A JP60096517 A JP 60096517A JP 9651785 A JP9651785 A JP 9651785A JP H0243821 B2 JPH0243821 B2 JP H0243821B2
- Authority
- JP
- Japan
- Prior art keywords
- coating
- hardness
- heating
- laser irradiation
- sprayed coating
- 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 - Lifetime
Links
Landscapes
- Coating By Spraying Or Casting (AREA)
Description
〔産業上の利用分野〕
本発明は、基体表面に溶射皮膜を有する鉄鋼製
品の処理方法に関する。
〔従来技術〕
最近、鉄鋼製品の耐蝕性或いは耐摩耗性付与の
ため、メツキに代わり耐蝕性或いは耐摩耗性のあ
るCu，Ni，Co，Cr，Ti，Mo等の金属或いはこ
れらの合金の溶射被膜を形成することが行われて
いる。
そして、Mo基合金のような比較的高融点の金
属合金を溶射した場合、溶射被膜と基体との密着
性が悪く、また、溶射被膜そのものに細孔が存在
し、被膜にクラツク等の欠陥が発生し易く、又金
属基体に熱歪による変形を生ずることもしばしば
あるという欠点があり、これらの欠点を無くすた
めの手段の一つとしてレーザ照射により処理する
ことが行われている。
さらに、かかる溶射被膜へのレーザ照射により
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、本出願人が先に特開昭61−113757号公報にお
いて開示したように、この熱影響少なくするため
に、レーザ照射に当たつては350℃以上の温度で
予熱が行なわれるのが通常である。
〔発明が解決しようとする問題点〕
しかしながら、この予熱のために溶射被覆層と
母材との相互拡散現象が顕著となり、母材中の
Fe，Ｃ等の原子が被覆層に侵入して、被膜の硬
度低下をもたらす。また、高融点の物質を照射す
るに際してレーザ出力を増大した場合でも同様の
現象が認められる。
この硬度低下は、基材自体が有する硬度その他
の特性を失わせるばかりではなく、溶射被膜その
ものの有する特性をも劣化させることになり、被
膜が本来的に有する耐摩耗性を低下させることに
なる。
本発明は、溶射被膜のレーザ照射後の硬度低下
を回復させることを目的とするものである。
〔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・ヒユージングし
た後の被膜を適当な温度で加熱することによつて
達成するとができる。
レーザ照射によつて溶融した被膜の凝固後の組
織は、合金元素を過飽和に固溶した不安定な結晶
状態にある。したがつて、レーザ・ヒユージング
した被膜を加熱することによつて、金属間化合
物，炭化物を被膜組織中に析出せしめて被膜の硬
度を上昇させるものである。
レーザ照射後の加熱温度は、厳密には溶射被膜
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溶射被膜の
硬度を回復させることが可能である。
また、そのための加熱時間は、溶射被膜が均一
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、炭化物が溶射材中に固溶して
再び硬度の低下を起こすことになる。
さらに、上記加熱によつて、レーザ照射による
基体の熱影響部の靭性も回復する。
〔実施例〕
長さ1000mm、幅500mm、厚さ10mmの鋼板表面を
シヨツトプラストにより清浄化した後、これに第
１表に示す組成の自溶合金をガス火災溶射法によ
り500μmの厚さに溶射被膜した。
[Industrial Application Field] The present invention relates to a method for treating a steel product having a thermally sprayed coating on the surface of a substrate. [Prior art] Recently, in order to impart corrosion resistance or wear resistance to steel products, thermal spraying of corrosion-resistant or wear-resistant metals such as Cu, Ni, Co, Cr, Ti, Mo, or alloys thereof has been used instead of plating. Forming a film is being carried out. When a metal alloy with a relatively high melting point, such as a Mo-based alloy, is thermally sprayed, the adhesion between the thermally sprayed coating and the substrate is poor, and the thermally sprayed coating itself has pores, causing defects such as cracks in the coating. There are disadvantages in that it is easy to occur and deformation due to thermal strain is often caused in the metal substrate, and one way to eliminate these disadvantages is to treat it by laser irradiation. Furthermore, the cooling rate of the coating melted by laser irradiation on such thermal sprayed coatings is extremely fast, approximately 1000°C/sec, and there is a problem that the material hardens due to martensitic transformation after heating and the surface condition deteriorates. As previously disclosed in Japanese Patent Application Laid-Open No. 113757/1983, in order to reduce this thermal effect, preheating is usually performed at a temperature of 350° C. or higher before laser irradiation. [Problems to be solved by the invention] However, due to this preheating, the mutual diffusion phenomenon between the thermal spray coating layer and the base material becomes remarkable, and the
Atoms such as Fe and C invade the coating layer, resulting in a decrease in the hardness of the coating. Furthermore, a similar phenomenon is observed even when the laser output is increased when irradiating a substance with a high melting point. This decrease in hardness not only causes the base material itself to lose its hardness and other properties, but also deteriorates the properties of the sprayed coating itself, reducing the coating's inherent wear resistance. . An object of the present invention is to recover the hardness of a thermally sprayed coating after laser irradiation. [Means for Solving the Problems] The above objects of the present invention can be achieved by heating the coating after laser fusing at an appropriate temperature. The structure of the coating melted by laser irradiation after solidification is in an unstable crystalline state in which alloying elements are dissolved in supersaturated solid solution. Therefore, by heating the laser-fused coating, intermetallic compounds and carbides are precipitated into the coating structure, thereby increasing the hardness of the coating. The heating temperature after laser irradiation strictly depends on the material or base material of the sprayed coating, but it is possible to sufficiently restore the hardness of the sprayed coating by heating it to a temperature range of 400 to 700℃. be. In addition, the heating time for this purpose is sufficient as long as the sprayed coating is heated uniformly; if it is too long, the intermetallic compounds and carbides precipitated at the grain boundaries will dissolve into the sprayed material and cause a decrease in hardness again. . Furthermore, the heating also restores the toughness of the heat-affected zone of the base body caused by laser irradiation. [Example] After cleaning the surface of a steel plate with a length of 1000 mm, a width of 500 mm, and a thickness of 10 mm using shotplast, a self-fluxing alloy having the composition shown in Table 1 was sprayed on it to a thickness of 500 μm using a gas fire spraying method. did.
本発明の溶射被膜の処理法によつて、レーザ照
射により劣化した基体と溶射被膜の性質を回復す
ることができ、溶射被膜へのレーザ照射による基
体と被膜の接着性と溶射被膜そのものの性質の向
上という効果を充分に発揮せしめることができ
る。
The thermal sprayed coating treatment method of the present invention can restore the properties of the substrate and thermal sprayed coating that have deteriorated due to laser irradiation, and improve the adhesion between the substrate and coating and the properties of the thermal sprayed coating itself due to laser irradiation of the thermal sprayed coating. The effect of improvement can be fully demonstrated.
添付図はレーザ照射後の加熱による溶射被膜と
基体の熱影響部の性質の回復状態を示す。第１図
は溶射被膜の硬度の回復状態を、また第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 thermally sprayed coating and the heat-affected zone of the substrate by heating after laser irradiation. FIG. 1 shows the state of recovery of the hardness of the sprayed coating, and FIG. 2 shows the state of recovery of the properties of the heat-affected zone of the substrate.
Claims (1)
350℃以上の温度に保持しつつ、前記被膜にレー
ザ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
着せしめたのち、200〜700℃の温度に加熱し、空
冷することを特徴とする溶射被膜の硬度回復方
法。1 Form a thermal spray coating on the surface of a steel substrate, and
While maintaining the temperature at 350°C or higher, the coating is irradiated with a laser to heat the coating material to a temperature higher than the melting point to fuse the steel base and the coating at the interface thereof, and then A method for recovering the hardness of a thermally sprayed coating, which is characterized by heating it to a temperature of °C and cooling it in air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9651785A JPS61253357A (en) | 1985-05-07 | 1985-05-07 | Method for restoring hardness of thermally sprayed film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9651785A JPS61253357A (en) | 1985-05-07 | 1985-05-07 | Method for restoring hardness of thermally sprayed film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61253357A JPS61253357A (en) | 1986-11-11 |
| JPH0243821B2 true JPH0243821B2 (en) | 1990-10-01 |
Family
ID=14167329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9651785A Granted JPS61253357A (en) | 1985-05-07 | 1985-05-07 | Method for restoring hardness of thermally sprayed film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61253357A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4862125B2 (en) * | 2005-12-06 | 2012-01-25 | 国立大学法人九州工業大学 | Method for reforming material with thermal spray coating |
| US8475609B2 (en) * | 2006-05-24 | 2013-07-02 | Bluescope Steel Limited | Treating Al/Zn-based alloy coated products |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518575A (en) * | 1978-07-28 | 1980-02-08 | Komatsu Ltd | Surface treating method |
-
1985
- 1985-05-07 JP JP9651785A patent/JPS61253357A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61253357A (en) | 1986-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9108276B2 (en) | Hardface coating systems and methods for metal alloys and other materials for wear and corrosion resistant applications | |
| JP3065674B2 (en) | Protective layer for base and method for forming protective layer | |
| US9982332B2 (en) | Hardface coating systems and methods for metal alloys and other materials for wear and corrosion resistant applications | |
| JPS5921267B2 (en) | Surface hardening method for metal substrates | |
| JPS5942070B2 (en) | What is the best way to do this? | |
| US2496971A (en) | Thermite coating process | |
| JPH0243821B2 (en) | ||
| JP2021515100A (en) | Articles with a nitrogen alloy protective layer and methods for manufacturing the articles | |
| JPS591678A (en) | Production of composite tool steel for hot working | |
| JPH02129330A (en) | High wear-resistant titanium alloy material | |
| JPS61113757A (en) | Treatment of film of different metals formed on surface of metallic substrate with laser | |
| JPS646273B2 (en) | ||
| US3800406A (en) | Tantalum clad niobium | |
| JPS58153731A (en) | How to reduce welding residual stress | |
| JP2638327B2 (en) | High wear-resistant titanium alloy parts | |
| US2664622A (en) | Method of effecting nonfusion welds with a steel weldrod | |
| JPS63140069A (en) | Method for manufacturing thin sheets or thin cross-section products | |
| Dubrovskii et al. | Electric resistance surfacing with a wire and with melting of the metals to be joined | |
| JP3389036B2 (en) | Anticorrosion coating method using mixed metal powder | |
| JP2597105B2 (en) | Copper member surface hardening method | |
| JPS60141861A (en) | Hearth roll for continuous annealing furnace having superior build-up resistance | |
| JPS63248572A (en) | Welding overlay method on the surface of copper parts | |
| JPH0364443A (en) | Composite roll for rolling and its manufacturing method | |
| JPS63255351A (en) | Composite overlay welding method for copper member surfaces | |
| JPS60255968A (en) | Manufacture of corrosion-resistance and wear-resistant covering material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |