Effect of different protective atmospheres on fatigue performance of 06Cr19Ni10 stainless steel welded joints

ZONG Huanxu; XU Hongji; GENG Tao; QI Yiyang

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Effect of different protective atmospheres on fatigue performance of 06Cr19Ni10 stainless steel welded joints
Vol. 48, Issue 1, Pages: 101-105(2018)
Published：2018
DOI：
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DOI：

ZONG Huanxu, XU Hongji, GENG Tao, et al. Effect of different protective atmospheres on fatigue performance of 06Cr19Ni10 stainless steel welded joints[J]. Eletric Welding Machine2018, 48(1): 101-105. DOI：

摘要

与CO

作为MAG焊常用的活性气体

其加入量对奥氏体不锈钢接头的疲劳性能有着一定的影响。通过脉动拉伸疲劳试验和金相组织分析

研究06Cr19Ni10钢MAG焊对接接头在两种不同保护气氛下的疲劳性能。结果表明:当保护气体为φ（Ar）95%+φ（CO

）5%时

中值疲劳强度为300 MPa;当保护气体为φ（Ar）97%+φ（O

）3%时

中值疲劳强度为302.5 MPa。二者疲劳性能良好且相近。试件断裂位置主要集中在热影响区

启裂区有明显启裂源;扩展区的疲劳纹清晰;终断区为韧窝型韧性断口;两种接头焊缝组织基体均为奥氏体

基体上分布δ铁素体。

Abstract

The oxygen and carbon dioxide are available active gas and both are commonly applied in MAG welding

the amount of their addition has definite influence on the fatigue performance of austenitic stainless steel. Through pulsating tensile fatigue test and metallographic structure analysis

the fatigue performance of MAG welding butt joint of 06Cr19Ni10 steel with two different kinds of protective atmospheres is studied. The results show that the median fatigue strength of φ（Ar）95% +φ（CO

）5% is 300 MPa

the median fatigue strength of φ（Ar）97%+φ（O

）3% is 302.5 MPa. The fracture location of specimen mainly concentrates in the heat affected zone. The crack starter location is obvious in the crack initiation zone;the fatigue striations on the extending zone are clear;the final broken zone is the toughness dimple type of fracture;the matrixes of the microstructures of two types of welded joints are both austenitic

and there are δ ferrites distribute on the matrix.