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首页> 外文期刊>Materials Science and Engineering >The effect of the initial microstructure of the X70 low-carbon microalloyed steel on the heat affected zone formation and the mechanical properties of laser welded joints
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The effect of the initial microstructure of the X70 low-carbon microalloyed steel on the heat affected zone formation and the mechanical properties of laser welded joints

机译：X70低碳微合金钢初始微观结构对热影响区形成的影响及激光焊接接头的力学性能

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摘要

In this paper, the heat affected zone (HAZ) of laser welded joints of the X70 steel were studied by the transmission electron microscopy method. The effect of the initial microstructure (coarse-grained hot-rolled and finegrained after cross-helical rolling) on the HAZ formation and the mechanical characteristics of the welded joints were shown. It was found that the microstructure in the inter-critical HAZ of the steel after cross-helical rolling was more dispersed, homogeneous, and uniform compared to that of the coarse-grained hot-rolled one due to the initial fine-grained ferrite-bainitic-pearlite microstructure and the absence of pronounced ferrite-pearlite banding in the base metal. The character of the microhardness value distribution in the HAZ of the steel after cross-helical rolling was smooth with the gradual decrease from 370 down to 185 HV as shifted towards the base metal. In the HAZ of the coarse-grained hot-rolled steel, the heterogeneous microhardness value (up to 640-670 HV) distribution was revealed. The reason was the upper degenerate bainite microstructure with high residual stresses, characterized by laths up to 2.0-2.5 μm long and a high martensitic-austenitic constituent fraction (10-16%) of a slender shape along the boundaries of bainite laths. The conclusion was drawn that one of the ways to reduce the brittleness of the laser welded joints could be using the initially fine-grained steels possessing the homogeneous (mainly bainitic) microstructure.
机译：本文采用透射电子显微镜法研究了X70钢的激光焊接接头的热影响区（HAZ）。图式示出了初始微观结构（粗粒状热轧和横向螺旋轧制后的粗磨）的效果。显示了焊接接头的HAZ形成和机械特性。结果发现，由于初始细粒状铁氧体 - 贝氏体，串联滚动后钢串联钢之后的钢际临界危险中的微观结构更加分散，均匀，并且均匀。 -Pearlite微观结构与基础金属中的明显铁氧体 - 珠光体带的缺失。横向螺旋轧制后钢之后的钢的HAZ中的显微硬度值分布的特征在于朝向基础金属的逐渐从370降至185HV的逐渐减小。在粗粒热轧钢的HAZ中，揭示了异质的微硬度值（高达640-670hv）分布。原因是具有高残余应力的上退化贝氏体微观结构，其特征在于沿贝氏体板条边界的长度高达2.0-2.5μm长的长度和高马氏体 - 奥氏体构成级分（10-16％）。得出的结论是降低激光焊接接头的脆性的方法之一可以使用具有具有均匀（主要贝氏体）微观结构的最初细粒的钢。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140075.1-140075.9|共9页
  • 作者

    A.I. Gordienko; L.S. Derevyagina; A.G. Malikov; A.M. Orishich; N.S. Surikova; M. N. Volochaev;

  • 作者单位

    Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences 2/4 Pr. Akademicheskii Tomsk 634055 Russia;

    Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences 2/4 Pr. Akademicheskii Tomsk 634055 Russia;

    Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences 4/1 Institutskaya str. Novosibirsk 630090 Russia;

    Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences 4/1 Institutskaya str. Novosibirsk 630090 Russia;

    Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences 2/4 Pr. Akademicheskii Tomsk 634055 Russia;

    Kirensky Institute of Physics of the Siberian Branch of the Russian Academy of Sciences (SB RAS) Akademgorodok 50 bid 38 Krasnoyarsk 660036 Russia Reshetnev Siberian State University of Science and Technology 31 Pr. Krasnoyarsk worker Krasnoyarsk 660037 Russia;

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  • 关键词

    Low-carbon steel; Cross-helical rolling; Laser welding; Heat affected zone; Bainite; Microhardness;

    机译：低碳钢;跨螺旋滚动;激光焊接;热影响区;贝氏体;微硬度;

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