Influence of residual stress on the cracking of the laser-cladded high-hardness coating

被引：18

作者：

Feng, Yulei ^{[1
]}

Feng, Kai ^{[2
,3
]}

Feng, Yueqiao ^{[2
,3
]}

Li, Zhuguo ^{[2
,3
]}

机构：

[1] WISDRI Engn & Res Inc Ltd, Wuhan 430223, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China

[3] Collaborat Innovat Ctr Adv Ship & Deep Sea Explora, Shanghai 200240, Peoples R China

来源：

MATERIALS LETTERS | 2023年 / 349卷

关键词：

Laser cladding; High hardness coating; Residual stress; Crack;

D O I：

10.1016/j.matlet.2023.134715

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A high-hardness Fe-C-W-Nb-B coating was prepared on 42CrMo substrate by laser cladding. The crack sensitivity, microstructure, and residual stress were studied and compared with commercial Fe-C-W-Mo coating produced by Ho & BULL;ganas. The results exhibit that all coatings had microstructure consisting of a martensite matrix and reinforcements. The single-pass coating had a residual stress of about -695.8 MPa, 1.21 times that of the commercial coating (-575.6 MPa). The coating exhibited compressive residual stress due to thermal and transformation stress interaction. The multi-pass coating was crack-free and presented a hardness higher than 900 HV. However, the commercial coating cracked, despite its hardness being only 791.4 HV. The high-hardness coating had a more uniform distribution of residual stress than the commercial coating, reducing the cracking risk.

引用

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