Microstructural evolution and mechanical properties of friction stir welded joint of Fe–Cr–Mn–Mo–N austenite stainless steel
Microstructural evolution and mechanical properties of friction stir welded joint of Fe–Cr–Mn–Mo–N austenite stainless steel
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DOI：
10.1016/j.matdes.2014.07.063
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发表时间：
2014-12
影响因子：
8.4
通讯作者：
Duoming Wang;D. Ni;B. Xiao;Z. Ma;W. Wang;Ke Yang
中科院分区：
文献类型：
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作者：
Duoming Wang;D. Ni;B. Xiao;Z. Ma;W. Wang;Ke Yang
采用搅拌摩擦焊（FSW），以800转/分、100毫米/分钟的速度成功地连接了2mm厚Fe-18.4Cr-15.8Mn-2.1Mo-0.66N高氮奥氏体不锈钢板。FSW没有导致熔核区氮的损失。由少量不连续的铁素体和细小的奥氏体晶粒组成的弧形带状组织是熔核区的显著组织特征。不连续的铁素体是由焊接过程中新形成的铁素体和残余的铁素体形成的，而细小的奥氏体晶粒是由FSW过程中初始奥氏体的动态再结晶形成的。熔核区细小的动态再结晶晶粒显著提高了基体的硬度。接头强度与母材相近，接头在母材区破坏。
2 mm thick Fe–18.4Cr–15.8Mn–2.1Mo–0.66N high nitrogen austenite stainless steel plate was successfully joined by friction stir welding (FSW) at 800 rpm and 100 mm/min. FSW did not result in the loss of nitrogen in the nugget zone. The arc-shaped band structure, consisting of a small amount of discontinuous ferrite aligning in the bands and fine austenite grains, was a prominent microstructure feature in the nugget zone. The discontinuous ferrite resulted from newly formed ferrite during welding and the remained ferrite, whereas the fine austenite grains were formed due to dynamic recrystallization of the initial austenite during FSW. The fine dynamically recrystallized grains in the nugget zone significantly increased the hardness compared to that of the base material. The strength of the joint was similar to that of the base material, with the joint failing in the base material zone.