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/mm^(2),对应的石墨粒子平均尺寸分别为1.30、1.80和1.90μm。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)。
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 1.90μm,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).
作者
万勇
马冬
迟敦苇
田莉杰
刘明启
温永红
Wan Yong;Ma Dong;Chi Dunwei;Tian Lijie;Liu Mingqi;Wen Yonghong(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan Anhui 243002,China;Weifang Special Steel Group Co.,Ltd.,Weifang Shandong 261000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第10期225-230,共6页
Heat Treatment of Metals
关键词
中碳高硅高铝钢
回火
石墨粒子
晶界形核
熟化速率
medium-carbon high-silicon high-aluminum steel
tempering
graphite particles
grain boundary nucleation
rate of ripening
