期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.12.079
关键词
N &T; PWHT; Microstructure; Tensile properties; P91
类别
资金
- Department of Science and Technology (DST) Govt. of India
- Indian Institute of Technology Roorkee
- BHEL Haridwar
- DST
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.
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