Recovery-Assisted Abnormal Grain Evolution of Selective Laser-Melted 316L Stainless Steel at Intermediate Temperatures

Metallurgical and Materials Transactions A Pub Date : 2024-09-12 DOI:10.1007/s11661-024-07578-3

Yushi Xiao, Chao Wang, Yashan Zhang, Xinyi Liu, Chuntao Qin, Zhijun Wang, Xin Lin, Jincheng Wang, Lilin Wang, Feng He

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Abstract

Selective laser-melted 316L stainless steel (SLM 316L SS) holds significant potential for application in the energy and chemical sectors owing to its commendable mechanical properties and corrosion resistance. However, the intricate process of microstructure evolution in SLM 316L SS at intermediate temperatures, encompassing the feasible range of service temperatures, needs to be more adequately comprehended. This research endeavors to elucidate the grain size and distribution alterations between 750 °C and 850 °C. Abnormal grain growth before recrystallization and re-refinement phenomena were observed, which deviated from conventional expectations. The texture was found to play a crucial role in former, while recovery-induced dislocation rearrangement and recrystallization nuclei formation contributed to the latter process. These findings provide new insights into the thermodynamic behavior of SLM 316L SS at medium to high temperatures.

Graphical Abstract

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中温下选择性激光熔化 316L 不锈钢的恢复辅助异常晶粒演化

选择性激光熔融 316L 不锈钢（SLM 316L SS）具有良好的机械性能和耐腐蚀性，因此在能源和化工领域有着巨大的应用潜力。然而，SLM 316L 不锈钢在中间温度（包括可行的使用温度范围）下微观结构演变的复杂过程需要得到更充分的理解。本研究致力于阐明 750 °C 至 850 °C 之间晶粒大小和分布的变化。在再结晶和再细化现象之前观察到了异常的晶粒生长，这与传统的预期不同。发现纹理在前者中发挥了关键作用，而复原诱导的位错重排和再结晶核的形成则促成了后者。这些发现为 SLM 316L SS 在中高温下的热力学行为提供了新的见解。

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Metallurgical and Materials Transactions A

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