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首页> 外文期刊>Materials Science and Engineering >Local strain hardening behavior in a dissimilar metal welded joint with buttering layer of ultra-supercritical turbine rotor
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Local strain hardening behavior in a dissimilar metal welded joint with buttering layer of ultra-supercritical turbine rotor

机译：用超超临界汽轮机转子的抛弃层不同金属焊接接头中的局部应变硬化行为

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摘要

Stratified tensile tests were performed to quantitatively investigate strain hardening behavior along a dissimilar metal welded joint (DMWJ) with buttering layer of ultra-supercritical turbine rotor. The results show weld region has lower tensile strength but better strain hardening capacity than base metals (BMs). The buttering layer (BL) exhibits higher strain hardening capacity than weld metal (WM). Two strain hardening exponents were found based on the fitted stress-strain curves using Hollomon equation. The lower exponent is related to the ferrite matrix, whereas the larger exponent is related to the precipitation phase, including martensite, bainite and sorbite. The gradient distribution of strain hardening exponent in heat affected zones (HAZs) is related to the gradient change of tempered martensite and grain size. The strain hardening mismatch in interface is related to the drastic changes in microstructure and amount of carbides. The dislocation cell structure and sub grain were observed after tensile tests, and carbides were elastic during tensile deformation. Kocks-Mecking (K-M) type plots of strain hardening rate versus true stress presented two hardening stages (stages Ⅲ and Ⅳ) in welded joint. More ferrite and finer tempered martensite are conductive to extending the strain hardening period. Local strain hardening parameters play an important role in the accurate evaluation of crack behavior in HAZ and interface.
机译：进行分层的拉伸试验以定量地沿着不同的金属焊接接头（DMWJ）与超超临界涡轮机转子的抛出层的应变硬化行为。结果显示焊接区域具有较低的拉伸强度，但比碱金属（BMS）更好的应变硬化容量。黄油层（BL）表现出比焊接金属（WM）更高的应变硬化容量。基于使用Hollomon方程的拟合应力 - 应变曲线发现两个应变硬化指数。下指数与铁氧体基质有关，而较大的指数与沉淀阶段有关，包括马氏体，贝氏体和索氏菌素。热影响区域（HAZS）中应变硬化指数的梯度分布与回火马氏体和晶粒尺寸的梯度变化有关。界面中的应变硬化失配与微观结构和碳化物量的剧烈变化有关。在拉伸试验后观察到位错细胞结构和亚颗粒，并且在拉伸变形期间碳化物是弹性的。 KOCKS-MECKING（K-M）应变硬化速率的型图与真应力呈现在焊接接头中的两个硬化阶段（Ⅲ和ⅳ）。更多的铁氧体和更细的钢化马氏体导电是延长应变硬化时段。局部应变硬化参数在危险和界面中的裂缝行为准确评估中起重要作用。

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  • 来源
    《Materials Science and Engineering》 |2020年第may21期|139379.1-139379.14|共14页
  • 作者

    Wenke Wang; Zhiqiang Dong; Zhenzhen Xu; Bo Zhu; Xiaofan Zhang; Jie Zhong; Jianxun Zhang;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 PR China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 PR China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 PR China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 PR China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 PR China;

    Dongfang Steam Turbine Limited Company Deyang 618000 PR China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 PR China;

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  • 正文语种 eng
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  • 关键词

    Strain hardening exponent; Hardening stage; Dissimilar metal welded joint; HAZ; Ultra-supercritical turbine rotor;

    机译：应变硬化指数;硬化阶段;不同的金属焊接接头;haz;超超临界汽轮机转子;

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