超纯铁素体不锈钢热变形过程中的析出行为

doi:10.12068/j.issn.1005-3026.2016.01.010

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (1): 44-48.DOI: 10.12068/j.issn.1005-3026.2016.01.010

超纯铁素体不锈钢热变形过程中的析出行为

高飞¹，刘振宇²，于福晓¹

(1. 东北大学材料与冶金学院，辽宁沈阳110819； 2. 东北大学轧制技术及连轧自动化国家重点实验室，辽宁沈阳110819)

收稿日期:2014-11-26 修回日期:2014-11-26 出版日期:2016-01-15 发布日期:2016-01-08
通讯作者: 高飞
作者简介:高飞(1985-)，男，山西运城人，东北大学博士后研究人员；刘振宇(1967-)，男，内蒙古赤峰人，东北大学教授，博士生导师；于福晓(1965-)，男，山东乳山人，东北大学教授，博士生导师.
基金资助:
国家科技支撑计划项目(2012BAE04B02)；国家自然科学基金资助项目(51271050); 中国博士后科学基金资助项目(2015M581346).

Precipitation Behavior of Ultra-pure Ferritic Stainless Steel During Hot Deformation

GAO Fei¹， LIU Zhen-yu²， YU Fu-xiao¹

1. School of Materials & Metallurgy， Northeastern University， Shenyang 110819， China; 2. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.

Received:2014-11-26 Revised:2014-11-26 Online:2016-01-15 Published:2016-01-08
Contact: GAO Fei
About author:-
Supported by:
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摘要/Abstract

摘要： 利用热力模拟实验机及试验轧机研究了添加Ti，V的超纯中铬铁素体不锈钢热变形过程中的析出行为变化特点，并采用热动力学计算及透射电子显微镜观察来表征析出相特征.结果表明:热变形过程中形成的析出相主要为TiC，这与热动力学分析一致.这些析出相的特征与变形温度密切相关，随着变形温度的降低，析出相TiC尺寸更加细小且分布更加弥散.这主要是由于变形温度降低时扩散速率相对较低，不利于析出相长大，而晶体缺陷增加，形变诱导析出的有效形核位置增加.这一热变形过程中的析出行为变化规律在中试试验条件下得到了验证.

关键词: 铁素体不锈钢, 热变形, 析出行为, 热动力学计算, 透射电子显微镜

Abstract: The precipitation behavior of an ultra-pure medium-chromium ferritic stainless steel with addition of Ti and V during hot deformation was studied using a thermomechanical simulator and pilot rolling mill. The characteristic of precipitates was investigated using thermodynamic calculation and transmission electron microscopy. The results showed that TiC is primary precipitate formed during hot deformation， in agreement with the thermodynamic calculation. The characteristic of these precipitates is closely dependent on deformation temperature. The TiC formed during hot deformation at relatively low temperature is finer in size and denser in dispersion than that at high temperature. This can be explained by a combination of the slower diffusion rate associated with the lower deformation temperature which is unfavorable to precipitate growth， and increasing lattice defects due to lower deformation temperature which can generate more nucleation sites for the strain-induced precipitates. This precipitation behavior during hot deformation is confirmed by the pilot rolling experiments.

Key words: ferritic stainless steel, hot deformation, precipitation behavior, thermodynamic calculation, transmission electron microscopy

中图分类号:

TG142.71

高飞，刘振宇，于福晓. 超纯铁素体不锈钢热变形过程中的析出行为[J]. 东北大学学报:自然科学版, 2016, 37(1): 44-48.

GAO Fei， LIU Zhen-yu， YU Fu-xiao. Precipitation Behavior of Ultra-pure Ferritic Stainless Steel During Hot Deformation[J]. Journal of Northeastern University Natural Science, 2016, 37(1): 44-48.

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超纯铁素体不锈钢热变形过程中的析出行为

Precipitation Behavior of Ultra-pure Ferritic Stainless Steel During Hot Deformation

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