Mechanical properties of welded joint of SA 738 Gr.B

ZHANG Junbao; CONG Dazhi; GU Yu; YU Yan

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Mechanical properties of welded joint of SA 738 Gr.B
Vol. 48, Issue 9, Pages: 26-31(2018)
DOI：

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ZHANG Junbao, CONG Dazhi, GU Yu, et al. Mechanical properties of welded joint of SA 738 Gr.B. [J]. 48(9):26-31(2018)
DOI：

ZHANG Junbao, CONG Dazhi, GU Yu, et al. Mechanical properties of welded joint of SA 738 Gr.B. [J]. 48(9):26-31(2018) DOI：

摘要

通过对SA-738 Gr.B采用SMAW(手工电弧焊)和GMAW(熔化极气体保护焊)的焊接接头进行焊态和焊后热处理态力学性能、组织结构分布特征对比分析研究,发现提高焊接热输入会降低焊接接头的冲击性能。随着热处理的进行,焊缝经历了回复、再结晶等变化过程,同时,焊缝和SMAW热影响区晶粒中夹杂物元素向晶界聚集,降低晶界结合能,导致焊缝和热影响区冲击韧性降低。

Abstract

Mechanical properties and microstructure of weld joint of SA 738 Gr.B with as welded and PWHT（post weld heat treatment）by SMAW（shielding metal arc welding）and GMAW（gas metal arc welding）are analyzed,it shows increasing welding heat input decreases impact properties of welded joint. During PWHT,weld undergoes grain recovery and recrystallization,meanwhile,inclusions in grain gather for weld and HAZ（heat affected zone） for SMAW at grain boundary,which decrease binding energy for grain boundary,it results in decreasing impact properties of weld and HAZ.

关键词

SA-738 Gr.B焊接接头冲击韧性

Keywords

SA-738 Gr.Bweld jointimpact properties

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