【摘 要】
：
In this work,we used the selective laser melting (SLM) fabricated Co-Cr alloy with prominent residual strain,extremely non-equilibrium microstructures,and low stacking fault energy as a precursor to fab-ricate materials with the optimal grain boundary cha
【机 构】
：
School of Mechanical Engineering,Sichuan University,Chengdu 610065,China;School of Mechanical Engine
论文部分内容阅读
In this work,we used the selective laser melting (SLM) fabricated Co-Cr alloy with prominent residual strain,extremely non-equilibrium microstructures,and low stacking fault energy as a precursor to fab-ricate materials with the optimal grain boundary character distribution.The grain boundary engineering(GBE) of the Co-Cr alloy was achieved by a simple heat treatment of the SLM-fabricated Co-Cr alloy.The obtained GBE Co-Cr alloy exhibited 81.47％ of special grain boundaries (∑3n n =1,2,3)),while it substantially disrupted the connectivity of the random high-angle boundaries,successfully reducing the propensity of intergranular degradation.Slow strain rate tests (SSRTs) showed that the GBE Co-Cr alloy possessed lower stress corrosion cracking (SCC) susceptibility and higher ductility in the corrosive en-vironment (0.9％ NaCl solution) than in the air.The high fraction of special boundaries,coupled with the stress-induced martensitic transformation (SIMT) in the GBE Co-Cr alloy yielded these results,which unique and rarely simultaneously satisfied for common structural materials.The current “SLM induced GBE strategy” offers a novel approach towards customized GBE materials with high SCC resistance and ductility in the corrosive environment,shedding new light on developing high-performance structural materials.
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