The fracture toughness of nickel based alloys can be degraded when exposed to low temperature deaerated water. This paper uses elastic-plastic fracture mechanics testing to explore some fundamental environmental and metallurgical factors that influence this form of environmentally assisted cracking. Elastic-plastic fracture toughness tests were performed on 0.6T compact tension samples of EN82H weld metal as a function of temperature, hydrogen content in the water, and hydrogen content in the weld metal. Tests were also performed on EN52 and three candidate replacement alloys for EN52 in order to compare their low temperature crack propagation resistance to EN82H. These results are used in conjunction with literature data and fundamental understanding to outline the environmental and material conditions that promote susceptibility to this form of hydrogen embrittlement.

Subject
Test methods, Crack growth, Materials, Fracture toughness, Moduli, Nickel based alloys, Displacement rate, Dissolved hydrogen, Deaerated water, Stress, Grain boundary, Alloys, Hydrogen
Keywords:
nickel based alloys, low temperature crack propagation, fracture toughness
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2011
GOV
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