Notably Accelerated Nano-Bainite Transformation via Increasing Undissolved Carbides Content on GCr15Si1Mo Bearing Steel

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-29 DOI:10.1007/s40195-023-01652-2

Yan-Hui Wang, Hua-Qiang Sun, Wen-Jing Feng, Lei-Jie Zhao, Xiang Chen, Qing-An Chen, Hai-Tao Sun, Jian-Jun Wang, Zhi-Nan Yang

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Abstract

In this study, a high-carbon nano-bainitic GCr15Si1Mo bearing steel was investigated. Specifically, the effects of content and size of undissolved carbides on the microstructure and transformation kinetics of nano-bainite were analyzed. The results demonstrated that after prolonged austempering at low temperatures, the mixed microstructure composed of nano-bainite (NB), undissolved carbides (UC), and retained austenite (RA) was obtained in GCr15SiMo steel. When the experimental steel was austenitized at 900 °C, the undissolved carbides gradually dissolved until reaching a stable state with increasing holding time. Furthermore, at the same austempering temperature, despite different volume fractions of undissolved carbides in the substrate, the volume fractions of nano-bainite in the final microstructures remained essentially the same. Moreover, the higher the content of undissolved carbides in steel, the faster the transformation rate of nano-bainite and the shorter the total transformation time.

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通过增加未溶解碳化物含量显著加速 GCr15Si1Mo 轴承钢的纳米贝氏体转变

本研究调查了一种高碳纳米贝氏体 GCr15Si1Mo 轴承钢。具体而言，分析了未溶解碳化物的含量和尺寸对纳米贝氏体微观结构和转变动力学的影响。结果表明，在 GCr15SiMo 钢中，经过长时间的低温奥氏体回火后，获得了由纳米贝氏体（NB）、未溶碳化物（UC）和残余奥氏体（RA）组成的混合显微组织。当实验钢在 900 °C 下进行奥氏体化时，随着保温时间的延长，未溶解碳化物逐渐溶解直至达到稳定状态。此外，在相同的奥氏体化温度下，尽管基体中未溶解碳化物的体积分数不同，但最终微结构中纳米贝氏体的体积分数基本保持不变。此外，钢中未溶解碳化物的含量越高，纳米贝氏体的转变速度越快，总转变时间越短。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.