探索奥氏体化条件对 11Cr-11Ni-Ti-Mo 马氏体时效不锈钢异质微观结构和机械性能的影响:强度-电导率权衡的突破

Chih-Yuan Chen, Iting Chiang, Po-Han Chiu, Tzu-Ching Tsao, Yo-Lun Yang, Yung-Chang Kang
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引用次数: 0

摘要

基于显微组织分析,本研究探讨了各种奥氏体化条件对钛钼马氏体不锈钢时效处理过程中金属间化合物颗粒(即η-NiTi)和反转奥氏体转变行为的影响,以及相关的力学性能。研究结果表明,许多微小的棒状金属间化合物颗粒(即η-NiTi)与马氏体基体具有伯格斯取向关系(即 // ; // ),以及分布在回火马氏体基体中的不同尺寸的块状、板条状和颗粒状反转奥氏体。无论奥氏体化处理条件如何,520 °C时效样品中的反转奥氏体都比640 °C时效样品中的反转奥氏体多。虽然这一发现与 Thermo-Calc 的预测不一致,但应该与不同时效温度下反转奥氏体的热稳定性有关。换句话说,正如 EBSD 分析所验证的那样,在 640 °C 时形成的大量反转奥氏体并没有在冷却过程中因二次马氏体转变而保留在室温下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring the effects of austenitizing conditions on the heterogeneous microstructure and mechanical properties of 11Cr–11Ni–Ti–Mo maraging stainless steel: Breakthrough in the strength-ductility trade-off
Based on the microstructure analysis, the present research investigated the influence of various austenitizing conditions on the transformation behavior of intermetallic compound particles, i.e. η-NiTi, and the reversed austenite during ageing treatment in Ti–Mo maraging stainless steel, as well as the related mechanical properties. The results revealed numerous tiny rod-like intermetallic compound particles, i.e. η-NiTi, having a Burgers orientation relationship, i.e., // ; //, with the martensite matrix, as well as blocky, lath, and granular reversed austenite of various sizes distributed within the tempered martensite matrix. Regardless of the austenitizing treatment condition, more reversed austenite was found in the samples aged at 520 °C than in those aged at 640 °C. Although this finding was not consistent with the Thermo-Calc predictions, it should be associated with the thermal stability of reversed austenite at different ageing temperatures. In other words, the greater amount of reversed austenite that formed at 640 °C did not remain at room temperature due to secondary martensite transformation during cooling, as was verified by EBSD analysis.
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