GCr15钢的等温冷却和连续冷却转变行为

doi:10.13251/j.issn.0254-6051.2025.05.008

金属热处理 ›› 2025, Vol. 50 ›› Issue (5): 46-50.DOI: 10.13251/j.issn.0254-6051.2025.05.008

GCr15钢的等温冷却和连续冷却转变行为

赵晓宇, 黄伟波, 鲁文佳, 杜尊令, 朱丽莎

肇庆学院机械与汽车工程学院, 广东肇庆 526061

收稿日期:2024-12-02 修回日期:2025-03-19 发布日期:2025-06-25
作者简介:赵晓宇(1990—),女,副教授,博士,主要研究方向为高碳钢的工艺控制及组织性能,E-mail:945490541@qq.com。
基金资助:
国家自然科学基金青年科学基金(52402484);肇庆市科技创新指导类项目(2023040306005);2023年肇庆学院校级自然科学类青年项目(QN202334);肇庆学院重点科研课题(ZD202410);广东省普通高校重点领域专项(自然科学)(2022ZDZX3035);广东省自然科学基金面上项目(2024A1515011408);国家自然科学基金面上项目(52372365);国家自然科学基金青年项目(52302521)

Isothermal transformation and continuous cooling transformation behavior of GCr15 steel

Zhao Xiaoyu, Huang Weibo, Lu Wenjia, Du Zunling, Zhu Lisha

College of Mechanical and Automotive Engineering, Zhaoqing University, Zhaoqing Guangdong 526061, China

Received:2024-12-02 Revised:2025-03-19 Published:2025-06-25

摘要/Abstract

摘要： 采用动态相变仪对GCr15轴承钢进行珠光体的等温和连续冷却相变试验,绘制TTT曲线、测量珠光体片层间距和计算珠光体发生完全转变的临界冷却速度。结果表明,GCr15钢变形奥氏体等温珠光体转变TTT曲线鼻尖温度为625 ℃,在该温度下的孕育期为7 s,珠光体完成转变所需时间为190 s。等温温度越低,GCr15钢中珠光体片层间距越小。利用Thermo-calc软件、采用体扩散机制及相关参数计算所得珠光体片层间距与试验结果符合较好,计算得到等温温度低于680 ℃时,珠光体片层间距小于100 nm。GCr15钢珠光体转变量随着冷却速度的增加而减小。通过Umemoto预测模型计算所得连续冷却过程中珠光体转变体积分数与试验结果符合良好,并推算出珠光体发生完全转变的临界冷却速度为1.68 ℃/s。

关键词: GCr15钢, 连续冷却转变, 等温处理, 珠光体, 预测模型

Abstract: Isothermal and continuous cooling transformation tests of pearlite in GCr15 bearing steel were carried out by using a dynamic phase transformation instrument. The TTT curve was plotted, the lamellar spacing of pearlite was measured, and the critical cooling rate for the complete transformation of pearlite was calculated. The results show that the nose temperature of the TTT curve for the isothermal pearlite transformation of deformed austenite in the GCr15 steel is 625 ℃, with incubation period of 7 s and complete transformation time of 190 s at this temperature. The lower the isothermal temperature is, the smaller the lamellar spacing of pearlite in the GCr15 steel is. The lamellar spacing of pearlite calculated by using the bulk diffusion mechanism and relevant parameters with the Thermo-calc software is in good agreement with the experimental results. It is calculated that when the isothermal temperature is lower than 680 ℃, the lamellar spacing of pearlite is less than 100 nm. The volume fraction of pearlite transformation in the GCr15 steel decreases with the increase of cooling rate. The volume fraction of pearlite transformation during the continuous cooling process calculated by Umemoto prediction model is in good agreement with the experimental results, and the critical cooling rate for the complete pearlite transformation is deduced to be 1.68 ℃/s.

Key words: GCr15 steel, continuous cooling transformation, isothermal treatment, pearlite, prediction model

中图分类号:

TG161

赵晓宇, 黄伟波, 鲁文佳, 杜尊令, 朱丽莎. GCr15钢的等温冷却和连续冷却转变行为[J]. 金属热处理, 2025, 50(5): 46-50.

Zhao Xiaoyu, Huang Weibo, Lu Wenjia, Du Zunling, Zhu Lisha. Isothermal transformation and continuous cooling transformation behavior of GCr15 steel[J]. Heat Treatment of Metals, 2025, 50(5): 46-50.

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GCr15钢的等温冷却和连续冷却转变行为

Isothermal transformation and continuous cooling transformation behavior of GCr15 steel

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