0.2 C-1.25 Si-2.0 Mn Q&P钢渗碳体的析出动力学分析

特殊钢 ›› 2020, Vol. 41 ›› Issue (5): 1-5.

• 试验研究 • 下一篇

0.2 C-1.25 Si-2.0 Mn Q&P钢渗碳体的析出动力学分析

何方¹, 雍岐龙¹, 杨才福¹, 刘自权²，吴彦欣³

1钢铁研究总院，北京100081 ；
2河钢集团邯钢技术中心，邯郸056015 ；
3北京科技大学，北京100083

收稿日期:2020-04-28 出版日期:2020-10-01 发布日期:2022-04-29
作者简介:何方(1982-),男，博士生(钢铁研究总院)，高级工程师, 云南大学(硕士)毕业,冷轧汽车用钢研究。
基金资助:
科技部十三五重点产业化提升项目资助（2017YFB0304103）

Precipitation Dynamics Analysis on Cementite in 0. 2 C-1.25 Si-2.0 Mn Q&P Steel

He Fang¹ , Yong Qilong¹ , Yang Caifu¹ , Liu Ziquan² , Wu Yanxin³

1 Central Iron and Steel Reserch Institute, Beijing 100081 ;
2 HBIS Group Hansteel Technology Center, Handan 056015 ；
3 University of Science & Technology Beijing, Beijing 100083

Received:2020-04-28 Published:2020-10-01 Online:2022-04-29

摘要/Abstract

摘要： 为研究Q&P(淬火-分配)钢临界区均热工艺对配分过程中渗碳体析出的影响,通过Avrami动力学方程对Q&P钢渗碳体析出的PTT(沉淀量-温度-时间)曲线进行了计算。通过热膨胀仪对Q&P钢进行了单相区退火、临界区退火,退火后淬火,并通过透射电镜检测室温下马氏体的衍射斑,计算马氏体的碳含量,以此推测高温下奥氏体中的碳含量。通过连续退火模拟机模拟了不同临界区退火的Q&P工艺。在扫描电镜下检测了析出渗碳体的尺寸,结合热处理工艺和渗碳体的熟化率计算了析出开始时间。由此得出了渗碳体析出体积分数5%的PTT曲线绝对位置。846℃均热的条件下鼻子点温度为300℃。811℃均热条件下,鼻子点温度上升至325℃,764℃均热条件下,鼻子点温度上升至400℃。在746～846℃均热,配分时间≤450 s的情况下,可以避免渗碳体的析出。

关键词: Q&, P钢, 临界区退火, 配分工艺, 渗碳体, 析出, PTT

Abstract: In order to study the effect of soaking process in critical zone of Q&P ( Queching and Partition) steel on the cementite precipitation during partitioning process, the PTT ( precipitation amount-temperature-time) curves of the cementite precipitation of steel Q&P are calculated by Avrami dynamic equation. Q&P steel is annealed in single phase zone and critical zone,and quenched after annealing by thermal dilatometer, the carbon content of martensite is calculated by measuring the diffraction spot of room temperature martensite with transmission electron microscopy to predict the carbon content of high temperature austenite. Different critical annealing Q&P process conditions are simulated by continuous annealing simulate machine. The size of precipitated cementite is measured by scanning electron microscopy. Combining heat treatment process and maturity rate of cementite, the starting time of precipitation is calculated. The absolute position of the 5% cementite precipitated volume fraction PTT curve is obtained. At the soaking condition of 846 °C , the nose temperature is 300 °C. At the condition of soaking at 811°C , the nose temperature rises to 325 °C , and at the condition of soaking at 764 °C , the nose temperature rises to 400 °C. The precipitation of cementite can be avoided when the partition time is ≤450 s at the condition of soaking at 746 ~ 846°C

Key words: Q&P Steel, Annealing in Critical Zone, Partitioning Process, Cementite, Precipitation, PTT

何方, 雍岐龙, 杨才福, 刘自权, 吴彦欣. 0.2 C-1.25 Si-2.0 Mn Q&P钢渗碳体的析出动力学分析[J]. 特殊钢, 2020, 41(5): 1-5.

He Fang , Yong Qilong , Yang Caifu' , Liu Ziquan , Wu Yanxin. Precipitation Dynamics Analysis on Cementite in 0. 2 C-1.25 Si-2.0 Mn Q&P Steel[J]. Special Steel, 2020, 41(5): 1-5.

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0.2 C-1.25 Si-2.0 Mn Q&P钢渗碳体的析出动力学分析

Precipitation Dynamics Analysis on Cementite in 0. 2 C-1.25 Si-2.0 Mn Q&P Steel

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