Prevention of microcracking by REM addition to alloy 690 filler metal in laser clad welds.

Content Provider	Semantic Scholar
Author	Okauchi, Hironori Saida, Kazuyoshi Nishimoto, Kazutoshi
Copyright Year	2011
Abstract	Effect of REM addition to alloy 690 filler metal on microcracking prevention was verified in laser clad welding. Laser clad welding on alloy 132 weld metal or type 316L stainless steel was conducted using the five different filler metals of alloy 690 varying the La content. Ductility-dip crack occurred in laser clad welding when La-free alloy 690 filler metal was applied. Solidification and liquation cracks occurred contrarily in the laser cladding weld metal when the 0.07mass%La containing filler metal was applied. In case of laser clad welding on alloy 132 weld metal and type 316L stainless steel, the ductility-dip cracking susceptibility decreased, and solidification/liquation cracking susceptibilities increased with increasing the La content in the weld metal. The relation among the microcracking susceptibility, the (P+S) and La contents in every weld pass of the laser clad welding was investigated. Ductility-dip cracks occurred in the compositional range (atomic ratio) of La/(P+S) 0.99(on alloy 132 weld metal), >0.90 (on type 316L stainless steel), while any cracks did not occur at La/(P+S) being between 0.21-0.99 (on alloy 132 weld metal) 0.10-0.90 (on type 316L stainless steel). Laser clad welding test on type 316L stainless steel using alloy 690 filler metal containing the optimum La content verified that any microcracks did not occurred in the laser clad welding metal.
Starting Page	346
Ending Page	352
Page Count	7
File Format	PDF HTM / HTML
DOI	10.2207/qjjws.29.346
Volume Number	29
Alternate Webpage(s)	https://www.jstage.jst.go.jp/article/qjjws/29/4/29_4_346/_pdf/-char/en
Alternate Webpage(s)	https://doi.org/10.2207/qjjws.29.346
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article