Comparative study on mechanical properties and microstructure of TIG welded joint of two kinds of austenitic stainless steel

YANG Sida; LIU Li’an; ZHAO Tao; LI Wukai

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Comparative study on mechanical properties and microstructure of TIG welded joint of two kinds of austenitic stainless steel
Vol. 49, Issue 3, Pages: 110-114(2019)
DOI：

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YANG Sida, LIU Li’an, ZHAO Tao, et al. Comparative study on mechanical properties and microstructure of TIG welded joint of two kinds of austenitic stainless steel. [J]. 49(3):110-114(2019)
DOI：

YANG Sida, LIU Li’an, ZHAO Tao, et al. Comparative study on mechanical properties and microstructure of TIG welded joint of two kinds of austenitic stainless steel. [J]. 49(3):110-114(2019) DOI：

摘要

针对3种厚度规格,开展了两种奥氏体不锈钢TIG焊接头力学性能及组织对比研究。两种不锈钢焊缝均成形良好,无目视可见缺陷。拉伸试验表明,两种材料接头均断于母材,0Cr18Ni9不仅接头的抗拉强度、硬度高于1Cr18Ni9Ti,并且硬度分布更均匀。1Cr18Ni9Ti接头组织中包含粗大的铁素体和奥氏体,而0Cr18Ni9接头组织中则有均匀细小的蠕虫状铁素体,因此力学性能较1Cr18Ni9Ti更为优异。

Abstract

wo kinds of austenitic stainless steel sheet samples with three kinds of thickness are welded by TIG welding,the mechanical properties and microstructure of the weld joints are investigated. By visual inspection, there is no defect on the weld samples surface. All weld samples fracture at the base mental,while the strength and hardness of welded joint of 0Cr18Ni9 weld sample are higher than those of 1Cr18Ni9Ti weld sample,and the hardness distribution of 0Cr18Ni9 is more homogeneous. Owning to fine and homogeneous vermicular ferrite in joint microstructure,the mechanical properties of 0Cr18Ni9 is better than that of 1Cr18Ni9Ti whose joint microstructure contains coarse ferrite and austenitic.