High Temperature Creep Properties of Reduced Activation Ferrite/Martensitic Steel Friction Stir Welded Joints

GAO Han; ZHOU Jiafen; LIANG Xudong; WANG Xiaohan; YIN Yuhuan; BAO Yunfeng; CUI Lei

doi:10.7512/j.issn.1001-2303.2023.03.12

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High Temperature Creep Properties of Reduced Activation Ferrite/Martensitic Steel Friction Stir Welded Joints
Vol. 53, Issue 3, Pages: 101-110(2023)
Received：20 February 2023，

Published：20 March 2023
DOI： 10.7512/j.issn.1001-2303.2023.03.12
稿件说明：

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高焓，周佳芬，梁旭东，等.低活化铁素体/马氏体钢搅拌摩擦焊接头的高温蠕变性能［J］.电焊机，2023，53（3）：101-110. DOI： 10.7512/j.issn.1001-2303.2023.03.12.

GAO Han, ZHOU Jiafen, LIANG Xudong, et al.High Temperature Creep Properties of Reduced Activation Ferrite/Martensitic Steel Friction Stir Welded Joints[J].Electric Welding Machine, 2023, 53(3): 101-110. DOI： 10.7512/j.issn.1001-2303.2023.03.12.

摘要

对5 mm厚度的低活化铁素体/马氏体钢（Reduced activation ferritic/martensitic steel，RAFM）进行了搅拌摩擦焊接，通过焊接接头的高温蠕变实验，研究低活化钢搅拌摩擦焊接头的高温蠕变性能与失效机理。结果表明，低活化钢搅拌摩擦焊接头高温力学性能良好。合金元素W和Ta含量高的RAFM钢的接头高温蠕变寿命更长，原因是Ta和W在高温环境中形成了更多的析出相，包括MX相和Laves相，对位错滑移的阻碍作用更强。650 ℃的蠕变寿命远远短于600 ℃的原因可能是，高温使得位错非常容易发生滑移，在Laves相还没有长大、MX相对位错滑移的阻碍作用不够强的情况下，在某些部位形成了密集的蠕变孔洞，造成有效横截面积急剧减少，应力集中严重，引发裂纹导致断裂。

Abstract

Friction stir welding (FSW) of Reduced activation ferritic/martensitic steel (RAFM) with a thickness of 5 mm was carried out. The high-temperature creep properties and failure mechanisms of FSW joints of were studied through high-temperature creep experiments. The results show that the mechanical properties of RAFM FSW joints are good at high temperature. The high temperature creep life of RAFM steel joints with high alloying elements W and Ta content is longer because Ta and W form more precipitated phases in high temperature environments

including MX and Laves phases

which have a stronger barrier effect on dislocation slip. The reason why the creep life at 650 ℃ is much shorter than that at 600 ℃ may be that high temperature make dislocations very prone to slip. When the Laves phase has not yet grown and the blocking effect of MX on dislocation slip is not strong enough

creep holes have been formed in some parts

resulting in a sharp reduction in the effective cross-sectional area

severe stress concentration

and initiation of cracks leading to fracture.

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