The effect of sigma phases formation depending on Cr/Ni equivalent ratio in AISI 316L weldments

被引：42
作者：
Kim, Y. H. [1 ]
Lee, D. J. [2 ]
Byun, J. C. [3 ]
Jung, K. H. [3 ]
Kim, J. I. [1 ]
Lee, H. J. [1 ]
Shin, Y. T. [4 ]
Kim, S. H. [5 ]
Lee, H. W. [1 ]
机构：
[1] Dong A Univ, Dept Mat Sci & Engn, Pusan 604714, South Korea
[2] HYUNDAI STEEL Co Ltd, Tech Res Ctr, Dangjin Gun 343823, Chungnam, South Korea
[3] Chosun Welding Co Ltd, Res Ctr, Ulsan 689896, South Korea
[4] Samsung Heavy Ind Co Ltd, Dept Welding Res, Geoje Si 656710, Gyoungnam, South Korea
[5] Silla Univ, Dept Automot Mech Engn, Pusan 617736, South Korea
来源：
MATERIALS & DESIGN | 2011年 / 32卷 / 01期
关键词：
DUCTILITY-DIP CRACKING; STAINLESS-STEEL; MECHANISM; BEHAVIOR;
D O I：
10.1016/j.matdes.2010.06.044
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The crack properties and toughness characteristics in AISI 316L weld metals were investigated in different chemical composition ranges of Cr and Ni contents. Three new filler wires were designed for the fluxcored arc welding (FCAW) process, and the Cr/Ni equivalent ratio and solidification mode of each weld metal was controlled. The microstructure revealed ductility-dip cracking (DDC) generated in the specimens containing <3 wt% of delta-ferrite (delta-ferrite). Sigma (sigma) phase precipitation occurred in the weld metals heat-treated at temperatures ranging from 650 degrees C to 950 degrees C. The amount of sigma in the delta-ferrite region increased significantly with increasing heat treatment time and temperature. At the highest Cr/Ni equivalent ratio, more of the sigma phase of the weld metal transformed faster after heat treatment, which deteriorated the toughness. Meanwhile, less sigma phase precipitation and DDC occurrence in the specimen containing <3 wt% of delta-ferrite did not affect the toughness reduction. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：330 / 336
页数：7
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