中南大学学报（自然科学版）2025，Vol.56Issue(4)：1320-1330,11.DOI:10.11817/j.issn.1672-7207.2025.04.006
低碳Q-P-T钢中残余奥氏体对高温拉伸性能的影响
Effect of retained austenite in low carbon Q-P-T steels on high temperature tensile properties
摘要
Abstract
The effect of retained austenite on the mechanical properties of Q-P-T steel at different temperatures was investigated.Axial tensile tests of both Q-T and Q-P-T steels at various temperatures(25,100,200 and 300 ℃)were conducted.The results indicate that the tensile strength of Q-T steel negatively correlates with temperature,while the tensile strength of Q-P-T steel exhibits an unusual trend of initially decreasing and then increasing with the increase of temperature.This phenomenon is due to the increased stability of retained austenite with the increase of temperature.At 300 ℃,the retained austenite in Q-P-T steel undergoes continuous phase transformation under high stress rather than premature phase transformation.The TRIP effect is more significant,leading to a different tensile strength trend compared to Q-T steel.The TRIP effect at high temperatures improves the coordination of deformation between phases,delays necking,suppresses the initiation of cracks and voids,and thereby increases the plasticity while maintaining strength in Q-P-T steel.关键词
Q-T钢/Q-P-T钢/TRIP效应/残余奥氏体/高温拉伸性能Key words
Q-T steel/Q-P-T steel/TRIP effect/retained austenite/high temperature tensile分类
金属材料引用本文复制引用
田起辉,秦盛伟,邸黎寅,卢金生..低碳Q-P-T钢中残余奥氏体对高温拉伸性能的影响[J].中南大学学报（自然科学版）,2025,56(4):1320-1330,11.基金项目
国家超级计算郑州中心创新生态系统建设科技专项(201400211200) （201400211200）
国家自然科学基金资助项目(52001281) （52001281）
河南省高等学校重点科研项目(25A430025)(Project(201400211200)supported by the Innovation Ecosystem Construction Science and Technology Special Program of the National Supercomputing Center in Zhengzhou （25A430025）
Project(52001281)supported by the National Natural Science Foundation of China （52001281）
Project(25A430025)supported by the Key Scientific Research Program of Henan Provincial Higher Education Institutions) （25A430025）
