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Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685, 2017년, pp.39 - 49   SCI SCIE
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Effect of normalization and tempering on microstructure and mechanical properties of V-groove and narrow-groove P91 pipe weldments

Pandey, Chandan (Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India ) ; Mahapatra, M.M. (School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 751013, India ) ; Kumar, Pradeep (Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India ) ; Saini, N. (Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India ) ;
  • 초록  

    Abstract In Very High Temperature Reactor (VHTR), The Nb-V modified 9Cr-1Mo (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.


  • 주제어

    N&T .   PWHT .   Microstructure .   Tensile properties .   P91.  

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