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Vol. 30. Issue 2.
Pages 86-91 (May - August 2018)
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Vol. 30. Issue 2.
Pages 86-91 (May - August 2018)
DOI: 10.1016/j.stmat.2018.01.005
Effect of cooling medium on microstructure evolution and tensile properties of creep-strength-enhanced ferritic steel
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C. Pandeya, N. Sainia,
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, J.G. Thakrea, M.M. Mahapatrab, P. Kumara
a Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India
b School of Mechanical Sciences, Indian Institute of Technology, Bhubaneswar, Odisha 751013, India
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Tables (2)
Table 1. Chemical composition of as-received C&F P91 steel, SMAW filler rod, %wt.
Table 2. Welding process parameter for diffusible hydrogen measurement.
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Abstract

In creep-strength-enhanced ferritic steels, hydrogen-induced cold cracking of weldments is a serious issue. In the present research work, the effect of cooling medium on tensile properties and microstructure evolution of P91 steel weldments has been studied. For water-cooling condition, the diffusible hydrogen metal in deposited metal was measured by the mercury method. The microstructure of weldments in different cooling condition was characterized by using the field-emission scanning electron microscope (FE-SEM) and optical microscope. The fractured tensile test samples were characterized using the FE-SEM. The maximum tensile strength was measured to be 624MPa for air-cooling medium (very low level of diffusible hydrogen).

Keywords:
P91
Diffusible hydrogen
Microstructure
Tensile tests

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