低水平应变 316L 不锈钢的再结晶成核机制及其对孪晶诱导晶界工程的影响

Qinqin He, Shuang Xia, Qin Bai, Yong Zhang, Lijiang Li
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引用次数: 0

摘要

孪晶诱导晶界工程(GBE)的热机械加工(TMP)通常采用奥氏体不锈钢的少量冷变形和随后的固溶温度退火。GBE TMP 过程中的成核机制对于理解晶界特征分布(GBCD)的演变至关重要。研究了一种 316L 奥氏体不锈钢的再结晶成核机制,该不锈钢在 5-10 pct 拉伸变形后在固溶退火温度下进行了短时间退火。通过分析再结晶核与附近变形晶粒之间的取向关系,发现大多数再结晶核是在应变诱导边界迁移(SIBM)机制下形成的。GBE 微观结构的典型特征--高孪晶晶粒簇的形成是由每个晶核开始的广泛多重孪晶造成的。在GBE过程中,低成核密度比晶核如何形成更为重要。晶簇外的部分再结晶前沿比其他晶簇更广泛地扩展到变形微观结构中。然而,生长优势与这些再结晶前缘的错向并无明显关联。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Recrystallization Nucleation Mechanism for a Low-Level Strained 316L Stainless Steel and Its Implication to Twin-Induced Grain Boundary Engineering

The Recrystallization Nucleation Mechanism for a Low-Level Strained 316L Stainless Steel and Its Implication to Twin-Induced Grain Boundary Engineering

The thermal-mechanical processing (TMP) for twin-induced grain boundary engineering (GBE) generally adopts a small amount of cold deformation and subsequent annealing at solution temperature of austenitic stainless steels. The nucleation mechanism during the TMP of GBE is essential to the understanding of the evolution of grain boundary character distribution (GBCD). The mechanism for recrystallization nucleation is investigated in a 316L austenitic stainless steel which was subjected to short-time annealing at solution-annealing temperature after 5–10 pct tensile deformation. A total of 22 recrystallization nuclei were found, and the analyzing of the orientation relationships between the nuclei and nearby deformed grains revealed that most of the nuclei are formed following the strain-induced boundary migration (SIBM) mechanism. The formation of highly twinned grain-clusters as the typical feature of GBE microstructure is a result of extensive multiple twinning starting from every single nucleus. Low nucleation density is more important than how the nucleus forms during GBE. A portion of the recrystallization front boundaries outside the clusters expanded into the deformation microstructure more extensively than the others. However, the growth advantage does not have an obvious correlation with the misorientation of these recrystallization front boundaries.

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