Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14055
Title: Laser transformation hardening of AISI 440C martensitic stainless steel for higher cavitation erosion resistance
Authors: Lo, KH
Cheng, FT
Man, HC 
Keywords: AISI 440C stainless steel
Cavitation erosion
Laser transformation hardening
Retained austenite
Issue Date: 2003
Publisher: Elsevier
Source: Surface and coatings technology, 2003, v. 173, no. 1, p. 96-104 How to cite?
Journal: Surface and coatings technology 
Abstract: Surface hardening of AISI 440C martensitic stainless steel was achieved by laser transformation hardening (LTH) using a high-power CW Nd:YAG laser. A hardened layer of a few 100 μm thick, composed of martensite, retained austenite and fine carbides was formed. The microstructure and hardness of the laser-treated layer were dependent on the laser processing parameters, with the hardness values reaching the range 600-800 HV. Compared with conventionally heat-treated samples, the laser-treated samples contained more retained austenite and finer carbides due to a higher degree of carbide dissolution. The cavitation erosion resistance of AISI 440C was significantly improved after laser treatment, and was approximately three-fold higher compared with that achieved by conventional heat treatment. The high erosion resistance was attributable to a desirable microstructure, which exhibited a favorable combination of hardness and toughness, and contained fewer weak sites for erosion attack.
URI: http://hdl.handle.net/10397/14055
ISSN: 0257-8972
EISSN: 1879-3347
DOI: 10.1016/S0257-8972(03)00347-5
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