理化检验-物理分册2024，Vol.60Issue(4)：1-4,4.DOI:10.11973/lhjy-wl202404001
一种汽车用微合金非调质钢的连续冷却转变
Continuous cooling transformation of a microalloyed non-quenched and tempered steel for automobile
摘要
Abstract
The continuous cooling transformation curve of supercooled austenite of a microalloyed non-quenched and tempered steel for automobile was measured,and the effect of cooling rate on phase transformation structure and microhardness was studied.The results show that the critical point Ac3 of the test steel was 838 ℃,and Ac1 was 732 ℃.When the cooling rate was less than 0.2 ℃/s,the continuous cooling transformation products of the test steel were ferrite,pearlite and bainite.When the cooling rate was 0.2 ℃/s,martensite appeared in the transformation product.When the cooling rate was 5 ℃/s,ferrite and pearlite disappeared,and the transformation products were bainite and martensite.With the increase of cooling rate,the content of martensite increased gradually,and the content of bainite decreased gradually or even disappeared completely.When the cooling rate increased to 20 ℃/s,the transformation products were martensite.With the increase of cooling rate,the microhardness of the test steel increased rapidly at first,and then the growth rate slowed down.关键词
微合金非调质钢/连续冷却转变曲线/临界点/显微组织/显微硬度Key words
microalloyed non-quenched and tempered steel/continuous cooling transformation curve/critical point/microstructure/microhardness分类
矿业与冶金引用本文复制引用
赵楠,孙晓冉,王程明,郭维超,赵剑磊..一种汽车用微合金非调质钢的连续冷却转变[J].理化检验-物理分册,2024,60(4):1-4,4.基金项目
河北省自然科学基金钢铁联合基金(E2022318003) （E2022318003）
