Microstructure and mechanical properties of TIG welded joints of high strength and plasticity low density high manganese steel

WU Zhiqiang; LI Huaying; LI Juan; FENG Sili; LU Liwei

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Microstructure and mechanical properties of TIG welded joints of high strength and plasticity low density high manganese steel
Vol. 48, Issue 3, Pages: 290-293(2018)
Published：2018
DOI：
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DOI：

WU Zhiqiang, LI Huaying, LI Juan, et al. Microstructure and mechanical properties of TIG welded joints of high strength and plasticity low density high manganese steel[J]. Eletric Welding Machine2018, 48(3): 290-293. DOI：

摘要

低密度高锰Fe-25Mn-8/10Al-1C钢是一种具有高强度和优异塑性的新型轻量化高碳高合金耐磨钢

其碳当量值和Al含量都很高

导致淬硬倾向和裂纹敏感性较大。通过合理控制热输入量的TIG焊接方法对不同铝含量的低密度高锰钢进行对接

获得较小变形和良好力学性能的焊接接头。焊缝区硬度值最低

远离焊缝中心热影响区的硬度值最高;随着Al含量的增加

10Al钢在熔合区和热影响区的硬度值均高于8Al钢

并且呈现出部分条状铁素体分布于奥氏体基体。

Abstract

Low density high manganese Fe-25 Mn-8/10 Al-1 C steel

a new lightweight high alloyed high carbon wear resistant steel

has extraordinary ductility and high tensile strength. This steel also has a larger tendency of cracking and hardening because of high carbon equivalent and aluminum content. The results showed that:the small deformation and good the performance of the joint was obtained due to the suitable welding heat input;minimum hardness value of the weld region

hardness value increased with the increase of the distance from the weld centerline;the hardness value of weld region and HAZ zone increased with the increase of the aluminum content

meanwhile

some strip ferrite is distributed in the austenite matrix of 10 Al steel.