Microstructure and mechanical properties of UNS N10003 alloy welded joints

详细信息    查看全文

• 作者：Shuangjian Chen^a ; ^b ; Xiang-Xi Ye^a ; Kun Yu^a ; ^b ; Chaowen Li^a ; ^{lichaowen@sinap.ac.cn} ; Zhijun Li^a ; Zhong Li^a ; Xingtai Zhou^a
• 关键词：Nickel based alloy ; Welding ; M6C ; Mechanical performance ; Strengthening mechanism
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：168-177
• 全文大小：3017 K
• 卷排序：682

文摘

Microstructure and mechanical performance of the welded joints of UNS N10003 alloy have been investigated in this work. Primary precipitates in base metal and eutectic precipitates in Heat Affected Zone (HAZ) and weld metal have been characterized and identified as M6C type. The hardness value of HAZ (Eutectic zone) is significantly higher than the rest of joint, including weld and base metal. Tensile tests suggested the welded joints possess a very stable mechanical performance at elevated temperature from 650 °C to 725 °C. Moreover all the tensile samples were fractured in base metal, indicating that the eutectic carbides have no adverse effects on the short-time mechanical performance of joint. The fine carbides, acting as dispersion strengthening in weld metal, are main contribution to enhance the hardness and strength of weld. The good mechanical performance of HAZ is ascribed to the presence of eutectic carbides and twins.