Embrittlement of laser surface-annealed 17-4 PH stainless steel
作者： L.W Tsay , T.Y Yang , M.C Young
DOI: 10.1016/S0921-5093(01)00941-8
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摘要: Abstract Stress corrosion cracking and fatigue crack growth behavior were determined in 17-4 PH stainless steel under various metallurgical conditions, including the H900 (482°C/1 h), H1025 (552°C/4 h) aging laser surface annealing treatments. Peak-aged (H900) specimens locally irradiated by beam consisted of a portion composite region (CR), which comprised soft laser-annealed (LA) zones on outer surfaces hard base metal between. Slow extension rate tensile tests performed at room temperature saturated H 2 S solution to evaluate hydrogen embrittlement susceptibility specimens. show an obvious improvement impact toughness after irradiating laser. Regardless testing environments, exhibited better properties than other Experimental results also indicated that had highest rates among specimens, particularly low stress intensity factor range. The retardation ahead CR LA was rather pronounced. For compact tension tested gaseous hydrogen, enhanced correlated with quasi-cleavage fracture contrast transgranular air.
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