A comparative study of microstructure and hydrogen embrittlement of selective laser melted and wrought 17–4 PH stainless steel
作者： Michella Alnajjar , Frédéric Christien , Cédric Bosch , Krzysztof Wolski
DOI: 10.1016/J.MSEA.2020.139363
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摘要: Abstract In this study, the microstructure and hydrogen embrittlement of 17–4 PH stainless steel produced by Selective Laser Melting (SLM) were investigated. The SLM-ed was found to be fully ferritic, in contrast wrought martensitic steel. This finding correlated high cooling heating rates SLM process that suppressed austenite formation retained delta ferrite room temperature. shows grains elongated building direction its grain size is higher than prior austenitic two steels present nanoscale copper precipitation after ageing 4 h at 580 °C. yield strength lower only 10% with respect evaluated performing slow strain rate tensile tests under cathodic charging It more susceptible compared counterpart. attributed difference microstructures, specifically size. crack initiation propagation much easier ferritic because fracture both due a significant subcritical growth followed fast overload remaining ligament. surface showed brittle intergranular mode close ductile center. associated growth, while final fracture. On other hand, steel, obtained transgranular cleavage. prone which subject same tendency air when notched specimens are used. propensity along boundaries can interpreted terms easiest path.
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