Grain boundary character and stress corrosion cracking behavior of Co-Cr alloy fabricated by selective laser melting
| Autor: | Xin Dong, Haojiang Shi, Yuntao Qu, Jiazhen Yan, Li Rui, Huabei Peng, Yanan Zhou, Qi Sun, Sheng Xu, Ning Li |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Mechanical Engineering Alloy Metals and Alloys 02 engineering and technology engineering.material Intergranular corrosion 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Mechanics of Materials Stacking-fault energy Materials Chemistry Ceramics and Composites engineering Grain boundary Selective laser melting Composite material Stress corrosion cracking 0210 nano-technology Ductility |
| Zdroj: | Journal of Materials Science & Technology. 93:244-253 |
| ISSN: | 1005-0302 |
| DOI: | 10.1016/j.jmst.2021.03.063 |
| Popis: | 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 fabricate 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 (Σ3n 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 environment (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. |
| Databáze: | OpenAIRE |
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