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Microstructure and mechanical properties of high-strength low alloy steel by wire and arc additive manufacturing
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-07-13 , DOI: 10.1007/s12613-019-1919-1
Yi-li Dai , Sheng-fu Yu , An-guo Huang , Yu-sheng Shi

A high-building multi-directional pipe joint (HBMDPJ) was fabricated by wire and arc additive manufacturing using high-strength low-alloy (HSLA) steel. The microstructure characteristics and transformation were observed and analyzed. The results show that the forming part includes four regions. The solidification zone solidifies as typical columnar crystals from a molten pool. The complete austenitizing zone forms from the solidification zone heated to a temperature greater than 1100°C, and the typical columnar crystals in this zone are difficult to observe. The partial austenitizing zone forms from the completely austenite zone heated between Ac1 (austenite transition temperature) and 1100°C, which is mainly equiaxed grains. After several thermal cycles, the partial austenitizing zone transforms to the tempering zone, which consistes of fully equiaxed grains. From the solidification zone to the tempering zone, the average grain size decreases from 75 to 20 µm. The mechanical properties of HBMDPJ satisfies the requirement for the intended application.



中文翻译:

线电弧添加制造高强度低合金钢的组织和力学性能

通过使用高强度低合金钢(HSLA)的钢丝和电弧增材制造制造了高层多向管接头(HBMDPJ)。观察和分析了显微组织特征和转变。结果表明,成形部分包括四个区域。固化区从熔池中固化为典型的柱状晶体。完整的奥氏体化区是由加热到高于1100°C的凝固区形成的,该区中典型的柱状晶体很难观察到。部分奥氏体区由加热到Ac1(奥氏体转变温度)和1100°C之间的完全奥氏体区形成,该区主要是等轴晶。经过几次热循环后,部分奥氏体区转变为回火区,由完全等轴的晶粒组成。从凝固区到回火区,平均晶粒尺寸从75微米减小到20微米。HBMDPJ的机械性能满足预期应用的要求。

更新日期:2020-07-13
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