析出硬化型 17-4PH 鋼の溶接部における変態と析出について(第 2 報) : 17-4PH 鋼の溶接熱影響部について

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In our previous paper, the nature of the precipitate in 17-4 PH stainless steel was described. In this paper, we report on the weld heat-affected zone of 17-4 PH stainless steel. The main conclusions obtained in the study are as follows; (1) The region within the HAZ somewhat was softened by weld thermal cycles and this region was not hardened by the aging treatment at 450℃ for 1hr after welding. (2) When the heating rate was increased to that in welding thermal cycles, A_s (martensite to austenite reversion temperature) increased from 600 to 750℃. (3) In austenite matrix, precipitates didn't nucleate but grew into rods. Resolution of the precipitates was not observed at relatively low austenitizing temperatures. With higher temperature (900℃) and prolonged holding time, precipitates became spheroidal. (4) Specimens which had been rapid- heated above A_s point and air- cooled contained 10∿20vol% retained austenite. This retained austenite was one of the causes of softening in HAZ.
社団法人溶接学会の論文
1970-08-25