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首页> 外文期刊>Materials Science and Engineering >The microstructure and mechanical properties of novel cryogenic twinning-induced plasticity steel welded joint
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The microstructure and mechanical properties of novel cryogenic twinning-induced plasticity steel welded joint

机译：新型低温孪晶诱导可塑性钢焊接接头的微观结构和力学性能

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摘要

Thick Fe-23Mn-l.5Al-0.45C high-Mn steel plates were multi-pass metal inert gas (MIG) welded with 307Si stainless steel wire. The microstructure, grain orientation and grain boundary evolution of the joint were investigated. The toughness impact at ambient and cryogenic temperatures, the microhardness and tensile strength were also measured. The weld metal (WM) is mainly composed of columnar dendrites, and the growth of grains in WM has obvious preferred orientation and significant stress concentration exists in the heat-affected zone (HAZ) and WM. In comparison to base material (BM), lower cryogenic impact toughness was obtained in WM, which was attributed to the precipitation of rod-shaped M7C3 carbide and the high proportion of low angle grain boundaries in WM. The microhardness is higher in HAZ than in BM, and the average microhardness of each pass weld is very different. The joint strength and efficiency are 669 MPa and 91.5%, respectively. With the decrease of impact test temperature (25°C, 0°C, -40°C, -196 °C), the impact toughness of BM and WM both decreased and the fracture mode of WM diverted from ductile to intergranular brittle.
机译：厚FE-23MN-L.5AL-0.45C高Mn钢板是用307SI不锈钢线焊接的多通金属惰性气体（MIG）。研究了关节的微观结构，晶粒取向和晶界演化。还测量了环境温度和低硬度和拉伸强度的韧性冲击。焊接金属（WM）主要由柱状树枝状晶体组成，WM中的晶粒的生长具有明显的优选取向，并且在热影响区域（HAZ）和WM中存在显着的应力浓度。与基材（BM）相比，WM中获得较低的低温冲击韧性，其归因于棒状M7C3碳化物的沉淀和WM中的低角度晶界比例的高比例。 SAZ中的显微硬度高于BM，并且每个通道焊缝的平均微硬度非常不同。关节强度和效率分别为669MPa和91.5％。随着冲击试验温度的降低（25℃，0℃，-40℃，-196℃），Bm和Wm的冲击韧性均降低，并且Wm的断裂模式从延性转移到晶状体脆性。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141449.1-141449.13|共13页
  • 作者

    Jiang Yang; Honggang Dong; Yueqing Xia; Peng Li; Yueting Ma; Wei Wu; Baosen Wang;

  • 作者单位

    School of Materials Science and Engineering Dalian University of Technology Dalian 116024 PR China;

    School of Materials Science and Engineering Dalian University of Technology Dalian 116024 PR China;

    School of Materials Science and Engineering Dalian University of Technology Dalian 116024 PR China;

    School of Materials Science and Engineering Dalian University of Technology Dalian 116024 PR China;

    School of Materials Science and Engineering Dalian University of Technology Dalian 116024 PR China;

    Baosteel Central Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 200431 PR China;

    Baosteel Central Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 200431 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Cryogenic steel; MIG welding; Grain boundary evolution; Precipitate; Mechanical property;

    机译：低温钢;MIG焊接;晶界演化;沉淀;机械性质;

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