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首页> 外文期刊>Materials Science and Engineering >Effect of normalization and tempering on microstructure and mechanical properties of V-groove and narrow-groove P91 pipe weldments
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Effect of normalization and tempering on microstructure and mechanical properties of V-groove and narrow-groove P91 pipe weldments

机译：正火和回火对V型槽和窄槽P91管件的组织和力学性能的影响

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摘要

In Very High Temperature Reactor (VHTR), The Nb-V modified 9Cr-lMo (P91) creep strength enhanced ferritic (CSEF) steel is currently considered as a candidate material for reactor internals and reactor pressure vessels (RPVs). After the welding of P91 steel, the inhomogeneous microstructure of weldment is a serious issue because it promotes the well-known Type IV cracking in P91 weldments. The present research work is focused on how the microstructure evolve in various zone of P91 pipe weldment during the sub-critical post weld heat treatment (PWHT) and normalized and tempered (N &T) heat treatment. The effect of PWHT and N &T heat treatment are also considered on tensile properties and hardness variation of P91 weldments. To characterize the sample scanning electron microscope (SEM), X-ray diffraction (XRD) and optical micrograph was used. It was observed that the N & T heat treatment provides the homogeneous microstructure compared to PWHT. The superior mechanical properties was also measured in N&T condition compared to PWHT. Study of fracture surface morphology of tensile tested specimen in different heat treatment condition is also presented.
机译：在超高温反应堆（VHTR）中，Nb-V改性的9Cr-1Mo（P91）蠕变强度增强铁素体（CSEF）钢目前被认为是反应堆内部和反应堆压力容器（RPV）的候选材料。在P91钢焊接之后，焊件的不均匀组织是一个严重的问题，因为它促进了P91焊件中众所周知的IV型开裂。目前的研究工作集中在亚临界焊后热处理（PWHT）和正火回火（N＆T）热处理期间P91管件的各个区域的显微组织如何演变。还考虑了PWHT和N＆T热处理对P91焊件的拉伸性能和硬度变化的影响。为了表征样品扫描电子显微镜（SEM），使用了X射线衍射（XRD）和光学显微照片。观察到，与PWHT相比，N＆T热处理提供了均匀的微观结构。与PWHT相比，在N＆T条件下也可测量出优异的机械性能。还提出了在不同热处理条件下拉伸试样的断裂表面形态的研究。

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  • 来源
    《Materials Science and Engineering》 |2017年第8期|39-49|共11页
  • 作者

    Chandan Pandey; M.M. Mahapatra; Pradeep Kumar; N. Saini;

  • 作者单位

    Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

    School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 751013, India;

    Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

    Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    NT; PWHT; Microstructure; Tensile properties; P91;

    机译：N＆T;PWHT;微观结构拉伸性能;P91;

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