微结构继承窗口对中间退火 Q&P 钢机械性能的影响

Ning Xu, Lingyu Wang, Jun Hu, Zhigang Jia, Weilin Xue, Wei Xu
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引用次数: 0

摘要

不同的初始微观结构会对中间退火淬火和分区钢的最终微观结构和机械性能产生重大影响。以往的研究主要关注不同初始微观结构继承到最终微观结构的机制,这种机制会影响相分数和机械性能。然而,这些研究忽略了临界退火过程中存在的继承窗口。在本研究中,我们研究了继承窗口,并探讨了不同初始微观结构对奥氏体反向转变、最终相分数和机械性能的影响。我们的研究结果表明,无论退火时间长短,不同的初始微观结构对最终微观结构和机械性能的影响都很小。然而,在 60 秒的临界退火处理中,具有更多成核位点的马氏体初始微观结构加快了奥氏体反向转变分数,提高了反向转变奥氏体含量,增加了原始马氏体含量,并改善了屈服强度。相反,线圈冷却样品的初始微观结构由铁素体和波来石组成,不含可溶性富锰胶结物,降低了奥氏体反向转变率,减少了反向转变奥氏体含量,提高了铁素体和 RA 含量,并改善了延展性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of microstructural inheritance window on the mechanical properties of an intercritically annealed Q&P steel
Different initial microstructures significantly influence the final microstructures and mechanical properties of the intercritically annealed quenching and partitioning steels. Previous studies have primarily focused on the mechanism for the inheritance of different initial microstructures into the final microstructures, which affects the phase fraction and mechanical properties. However, these studies have overlooked the existence of an inheritance window in the intercritical annealing process. In this study, we investigated the inheritance window and explored the impact of varying initial microstructures on the reverse transformation of austenite, final phase fraction, and mechanical properties. Our findings reveal that the varying initial microstructure exhibits minimal influence on the final microstructure and mechanical properties for short or long annealing times. However, for the intercritical annealing treatment for 60 s, the initial microstructure of martensite with more nucleation sites accelerated the austenite reverse transformation fraction, enhanced the reverse-transformed austenite content, increased the primary martensite content, and improved the yield strength. Conversely, the coil-cooled sample, with initial microstructures consisting of ferrite and pearlite without dissoluble Mn-rich cementites, reduced the austenite reverse transformation rate, decreased the reverse-transformed austenite content, enhanced the ferrite and RA content, and improved ductility.
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