Submerged Arc Stainless Steel Strip Cladding—Effect of Post-Weld Heat Treatment on Thermal Fatigue Resistance

被引：0
作者：
I.C. Kuo
C.P. Chou
C.F. Tseng
I.K. Lee
机构：
[1] National Chiao Tung University,Department of Mechanical Engineering
[2] National Formosa University,Department of Materials Science and Engineering
[3] Dayeh University,Department of Materials Science and Engineering
来源：
Journal of Materials Engineering and Performance | 2009年 / 18卷
关键词：
carbide; hardness; martensitic stainless steel; post-weld heat treatment; submerged arc cladding; thermal fatigue resistance;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Two types of martensitic stainless steel strips, PFB-132 and PFB-131S, were deposited on SS41 carbon steel substrate by a three-pass submerged arc cladding process. The effects of post-weld heat treatment (PWHT) on thermal fatigue resistance and hardness were evaluated by thermal fatigue and hardness testing, respectively. The weld metal microstructure was investigated by utilizing optical microscopy, scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM). Results showed that, by increasing the PWHT temperature, hardness decreased but there was a simultaneous improvement in weldment thermal fatigue resistance. During tempering, carbide, such as (Fe, Cr)23C6, precipitated in the weld metals and molybdenum appeared to promote (Fe, Cr, Mo)23C6 formation. The precipitates of (Fe, Cr, Mo)23C6 revealed a face-centered cubic (FCC) structure with fine grains distributed in the microstructure, thereby effectively increasing thermal fatigue resistance. However, by adding nickel, the AC1 temperature decreased, causing a negative effect on thermal fatigue resistance.
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页码：154 / 161
页数：7
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