Surface hardening of AISI 420 stainless steel by using a nanosecond pulse laser
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Publication Details
Author list: Netprasert O., Tangwarodomnukun V., Dumkum C.
Publisher: Trans Tech Publications
Publication year: 2018
Volume number: 911 MSF
Start page: 44
End page: 48
Number of pages: 5
ISBN: 9783035712032
ISSN: 0255-5476
eISSN: 1662-9752
Languages: English-Great Britain (EN-GB)
Abstract
Unlike the conventional heat treatments, laser hardening process can selectively and locally harden the workpiece surface with minimum part distortion, thus making the process suitable for small or thin workpieces. To elucidate a better understanding of process performance, this paper presents an investigation of laser hardening process for AISI 420 martensitic stainless steel. A nanosecond pulse laser was used as a heat source to harden the metal surface. The effects of laser power scan overlap and scan speed on micro-hardness and case depth were experimentally examined. The results revealed that the micro-hardness of stainless steel surface increased from 242 HV to 1700 HV without any sign of surface melting. The depth of hardened layer was found to be 60-80 ตm depending on laser power, scan speed and scan overlap applied. In addition, the scan overlap of 50% was recommended to lessen the deviation of micro-hardness across the laser-scanned area. ฉ 2018 Trans Tech Publications, Switzerland.
Keywords
Hardening
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