中碳高硅高铝钢回火过程石墨析出动力学

doi:10.13251/j.issn.0254-6051.2023.10.035

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 225-230.DOI: 10.13251/j.issn.0254-6051.2023.10.035

中碳高硅高铝钢回火过程石墨析出动力学

万勇¹, 马冬¹, 迟敦苇², 田莉杰¹, 刘明启¹, 温永红¹

1.安徽工业大学冶金工程学院, 安徽马鞍山 243002;
2.潍坊特钢集团有限公司, 山东潍坊 261000

收稿日期:2023-05-10 修回日期:2023-08-12 出版日期:2023-10-25 发布日期:2023-12-07
作者简介:万勇(1987—),男,副教授,主要研究方向为石墨易切削钢, E-mail:wanyong0729@163.com

Kinetics of graphite precipitation during tempering process of a medium-carbon high-silicon high-aluminum steel

Wan Yong¹, Ma Dong¹, Chi Dunwei², Tian Lijie¹, Liu Mingqi¹, Wen Yonghong¹

1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243002, China;
2. Weifang Special Steel Group Co., Ltd., Weifang Shandong 261000, China

Received:2023-05-10 Revised:2023-08-12 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜及石墨粒子生长动力学方程对中碳高硅高铝钢回火过程组织及石墨粒子的析出行为和形核长大机制进行了系统研究。结果表明,中碳高硅高铝钢在680 ℃回火2、5和8 h后的石墨粒子总密度分别2539、4791和6405个/mm²,对应的石墨粒子平均尺寸分别为1.30、1.80和1.90 μm。在680 ℃回火过程中,石墨粒子主要在铁素体晶界形核,其临界形核尺寸约为0.6 nm,在铁素体中的长大行为遵循Ostwald 熟化规律,熟化速率为29.38 nm·s^-1/3。

关键词: 中碳高硅高铝钢, 回火, 石墨粒子, 晶界形核, 熟化速率

Abstract: Microstructure, precipitation behavior and nucleation and growth mechanism of graphite particles during tempering process of a medium-carbon high-silicon high-aluminum steel were systematically studied by means of metallographic microscope, scanning electron microscope and graphite particle growth kinetics equation. The results show that after tempering at 680 ℃ for 2, 5 and 8 h, the total density of graphite particles is 2539, 4791 and 6405 number·mm^-2, respectively, and the corresponding average size of graphite particles is 1.30, 1.80 and 1.90 μm, respectively. During tempering at 680 ℃, the nucleation of graphite particles is mainly at the grain boundary of ferrite, and the critical nucleation size is about 0.6 nm. The growth behavior of graphite particles in ferrite follows the Ostwald ripening rule, and the ripening rate is 29.38 nm·s^-1/3.

Key words: medium-carbon high-silicon high-aluminum steel, tempering, graphite particles, grain boundary nucleation, rate of ripening

中图分类号:

TG142.7

万勇, 马冬, 迟敦苇, 田莉杰, 刘明启, 温永红. 中碳高硅高铝钢回火过程石墨析出动力学[J]. 金属热处理, 2023, 48(10): 225-230.

Wan Yong, Ma Dong, Chi Dunwei, Tian Lijie, Liu Mingqi, Wen Yonghong. Kinetics of graphite precipitation during tempering process of a medium-carbon high-silicon high-aluminum steel[J]. Heat Treatment of Metals, 2023, 48(10): 225-230.

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中碳高硅高铝钢回火过程石墨析出动力学

Kinetics of graphite precipitation during tempering process of a medium-carbon high-silicon high-aluminum steel

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