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Effect of thermo-mechanical treatment on microstructure and mechanical properties of P92 heat resistant steel

机译：热处理对P92耐热钢组织和力学性能的影响

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摘要

The effect of thermo-mechanical treatment on the microstructure and mechanical properties of commercial P92 steel was investigated. The steels were warm-rolled in metastable austenitic state with reductions of 75 and 93%, respectively. Tempering in a certain temperature range from 650 to 765 ℃ for 1 h was subsequently used to optimize the size of precipitates and form a homogeneous steady-state dislocation structure through recovery process. The results showed that the micro-structure was obviously refined and a great amount of nano-scale precipitates were increased significantly compared to the as-received material. The tensile strengths and microhardness were significantly improved by increasing plastic deformation and tempering at 650 and 700 ℃, but were decreased dramatically after tempering at 765 ℃. The creep tests were carried out at 600 ℃ under 210 MPa and at 650 ℃ under 160 MPa. The results demonstrated that the creep rupture life of the thermo-mechanical treated P92 steel was improved significantly. High density of homogeneously distributed precipitates reduced creep rates by pinning the grain boundaries and blocking the motion of dislocation.
机译：研究了热机械处理对商用P92钢的组织和力学性能的影响。这些钢在亚稳态奥氏体状态下进行了热轧，分别降低了75％和93％。随后在650至765℃的一定温度下回火1 h，以优化沉淀物的尺寸，并通过回收过程形成均匀的稳态位错结构。结果表明，与原样材料相比，其微观结构明显细化，并且大量的纳米级析出物显着增加。通过在650和700℃下增加塑性变形和回火，抗拉强度和显微硬度得到显着改善，但在765℃回火后，抗拉强度和显微硬度却显着下降。蠕变试验是在600℃，210 MPa和650℃，160 MPa下进行的。结果表明，经热机械处理的P92钢的蠕变断裂寿命得到了显着改善。通过固定晶界并阻止位错运动，高密度均匀分布的沉淀物降低了蠕变速率。

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  • 来源
    《Materials Science and Engineering》 |2013年第1期|882-888|共7页
  • 作者

    Shengzhi Li; Zumrat Eliniyaz; Feng Sun; Yinzhong Shen; Lanting Zhang; Aidang Shan;

  • 作者单位

    School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    thermo-mechanical treatment; microstructure; mechanical properties;

    机译：热机械处理;微观结构机械性能;

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