Laser-treatment-induced surface integrity modifications of stainless steel

被引：7

作者：

Gong, Na ^{[1
]}

Wei, Yuefan ^{[2
]}

Meng, Tzee Luai ^{[1
]}

Karyappa, Rahul ^{[1
]}

Cao, Jing ^{[1
]}

Tan, Chee Kiang Ivan ^{[1
]}

Suwardi, Ady ^{[1
]}

Zhu, Qiang ^{[1
]}

Liu, Hongfei ^{[1
]}

机构：

[1] ASTAR, Inst Mat Res & Engn IMRE, 2 Fusionopolis Way, Singapore 138634, Singapore

[2] ASTAR, Adv Remfg & Technol Ctr ARTC, 3 Cleantech Loop, Singapore 637143, Singapore

来源：

MATERIALS RESEARCH EXPRESS | 2023年 / 10卷 / 03期

关键词：

laser treatment; martensitic steel; gamma-phase precipitation; oxidation; ablation; surface melting and resolidification; TEMPERATURE;

D O I：

10.1088/2053-1591/acbe93

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Scanning of a high-power laser beam on the surface of martensitic stainless steel (SS420) has been studied, addressing the effect of scanning rate Von integrity modifications in the near-surface regions. Structural, compositional, and crystallographic characterizations revealed the presence of ablations, surface melting/resolidification, surface oxidations, and austenite (7-phase) precipitations when V <= 20 mm s(-1). Melt pool (MP), heat affected zone (HAZ), and base material have been clearly distinguished at the cross-section of the slow-scanned samples. Adjacent MPs partially overlapped when V = 5 mm s(-1). The gamma-phase precipitations solely occurred in the MPs, i.e., of 400 mu m deep for V = 5 mm s(-1), while oxidations dominantly occurred in the surface regions of shallower than similar to 30 mu m within the MPs. Compositional analysis revealed increased Cr-, Mn-, and Si-to-Fe ratios at the laser scanned surface but without variations along the surface normal direction. The enhanced surface hardness has been achieved up to 805 HV, and the hardness monotonically decreased when moving deeper (i.e.,similar to 1000 mu m) into the base material. These observations shed new light on surface engineering of metallic alloys via laser-based direct energy treatments.

引用

页数：9

共 44 条

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