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)
DOI：

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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]. 48(3):290-293(2018)
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]. 48(3):290-293(2018) 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.