一种低密度钢等温压缩时组织的演化和动态再结晶

doi:10.11901/1005.3093.2024.082

材料研究学报

2024, Vol. 38

Issue (10): 768-781 DOI: 10.11901/1005.3093.2024.082

研究论文

本期目录 | 过刊浏览

一种低密度钢等温压缩时组织的演化和动态再结晶

孙建¹^,²(

), 李景辉², 黄贞益², 章小峰², 王东生¹, 刘述庆¹

^1.铜陵学院机械工程学院铜陵 244061
^2.安徽工业大学冶金工程学院马鞍山 243002

Microstructure Evolution and Dynamic Recrystallization of a Low Density Steel during Isothermal Compression

SUN Jian¹^,²(

), LI Jinghui², HUANG Zhenyi², ZHANG Xiaofeng², WANG Dongsheng¹, LIU Shuqing¹

^1.School of Mechanical Engineering, Tongling University, 244061 Tongling, China
^2.School of Metallurgical Engineering, Anhui University of Technology, 243002 Ma'anshan, China

引用本文:

孙建, 李景辉, 黄贞益, 章小峰, 王东生, 刘述庆. 一种低密度钢等温压缩时组织的演化和动态再结晶[J]. 材料研究学报, 2024, 38(10): 768-781.
Jian SUN, Jinghui LI, Zhenyi HUANG, Xiaofeng ZHANG, Dongsheng WANG, Shuqing LIU. Microstructure Evolution and Dynamic Recrystallization of a Low Density Steel during Isothermal Compression[J]. Chinese Journal of Materials Research, 2024, 38(10): 768-781.

全文: PDF(24352 KB) HTML

摘要:

对一种低密度钢Fe-29.96Mn-9.56Al-1.01C在温度为850~1100℃和应变速率为0.01~10 s^-1条件下进行等温压缩，用OM、EBSD和TEM等手段对其表征并构建基于应变补偿的本构方程，研究这种钢在等温压缩过程中的组织演化和动态再结晶以及Z参数对其动态再结晶的影响。结果表明，低温和高应变速率有利于钢中生成细小的动态再结晶晶粒，但是再结晶不充分。应变速率的降低和温度的提高，可使这种钢的动态再结晶较为充分。低密度钢的动态再结晶与Z值有密切的关系。高温和低应变速率的变形条件有利于Z值较低的低密度钢发生再结晶和晶粒的长大。Z值处于中高值的低密度钢，其动态再结晶的晶粒细较小和保留原始带状组织，再结晶程度较低。在低密度钢的热变形过程中晶界取向差呈双峰结构，其主要动态再结晶机制是非连续动态再结晶，在各个热压缩条件下连续动态再结晶和几何动态再结晶的程度都比较低。

关键词 ：材料科学基础学科, Fe-Mn-Al-C, 低密度钢, 等温压缩, 组织演化, 动态再结晶

Abstract：

A low-density steel Fe-29.96Mn-9.56Al-1.01C was isothermal compressed in a temperature range of 850~1100^oC and strain rate range of 0.01~10 s^-1, meanwhile, the microstructure evolution and dynamic recrystallization process of the steel were studied by OM, EBSD and TEM. On this basis, the corresponding constitutive equation of the steel is constructed based on strain compensation, and the effect of Z parameter on the dynamic recrystallization of the steel was analyzed. The results show that the conditions of low temperature and high strain rate are beneficial to the formation of fine dynamic recrystallization grains, but the recrystallization is not sufficient. In comparison, the conditions of decreasing strain rate while increasing temperature are more favorable to the completion of the dynamic recrystallization process of the steel. The Z-value has an important relationship with the dynamic recrystallization of the steel, i.e. the deformation condition of high temperature and low strain rate is conducive to the recrystallization and the grain growth for the steel with low Z-value. For the steel with middle and high Z values of, the same condition may be conductive to the formation of fine dynamic recrystallization grains, the retention of the original band-structure, and thereby a low degree of recrystallization. The grain boundary orientation difference of the steel shows a bimodal structure during thermal deformation. The main dynamic recrystallization mechanism of the steel is discontinuous dynamic recrystallization. The degree of continuous dynamic recrystallization and geometric dynamic recrystallization is weak under different thermal compression conditions.

Key words： foundational discipline in materials science Fe-Mn-Al-C low density steel isothermal compression microstructure evolution dynamic recrystallization

收稿日期: 2024-02-19

ZTFLH:

TG142.1

基金资助:国家自然科学基金(51674004);国家自然科学基金(51805002);安徽省高等学校自然科学研究重点项目(2022AH051760);铜陵学院自然科学研究项目(2023tlxy05);铜陵学院自然科学研究项目(2023tlxy03);铜陵学院自然科学研究项目(2017tlxy23);工程液压机器人安徽普通高校重点实验室(铜陵学院)开放课题资助项目(TLXYCHR-O-21YB03)

通讯作者: 孙建，副教授，sjxa0913@163.com，研究方向为先进钢铁材料组织性能控制

Corresponding author: SUN Jian, Tel: (0562)5882096, E-mail: sjxa0913@163.com

作者简介: 孙建，男，1988年生，博士

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图1 低密度钢在不同变形条件下的真应力-真应变曲线

表1 不同应变下的材料参数

Alloy	T / ^oC	$ε ˙$ / s^-1	Phase	n	α / mm^-2·N^-1	Q / kJ·mol^-1	References
Fe-27Mn-11.5Al-0.95C	900~1150	0.01~10	γ + δ	3.93	0.0035	294.20	[11]
Fe-27.34Mn-8.63Al-1.03C	900~1150	0.01~5	γ	4.24	0.0107	422.88	[25]
Fe-25.14Mn-10Al-1.46C	900~1150	0.01~10	γ	5.14	0.0060	669.84	[34]
Fe-29.96Mn-9.56Al-1.01C	850~1100	0.01~10	γ	4.01~6.63	0.0041~0.0054	331.76~415.30	Present work

表2 低密度钢的相组成、材料常数(n，α)和热变形激活能

图2 低密度钢的真应变ε分别与α，n，Q，lnA的拟合曲线

表3 材料参数α、n、Q和lnA的第6个多项式系数

图3 在不同热压缩条件下低密度钢的流动应力预测值与实测值的比较

图4 低密度钢在不同变形条件下的流动应力实测值与预测值的对比

$ε ˙$ / s^-1	lnZ
$ε ˙$ / s^-1	850^oC	900^oC	950^oC	1000^oC	1050^oC	1100^oC
0.01	38.2	36.4	34.7	33.2	31.8	30.4
0.1	40.5	38.7	37.0	35.5	34.1	32.7
1	42.8	41.0	39.3	37.8	36.4	35.0
10	45.1	43.3	41.6	40.1	38.7	37.3

表4 不同应变速率和变形温度下的lnZ值

图5 低密度钢Z参数值的区分示意图

图6 Z值在Ⅰ区范围内的低密度钢热压缩后的微观组织

图7 Z值在Ⅱ区范围内的低密度钢热压缩后的微观组织

图8 低密度钢的Z值在Ⅲ区范围内热压缩后的微观组织

图9 变形参数与lnZ的关系

图10 动态再结晶临界应变和应力与lnZ的关系

图11 低密度钢热变形组织的反极图(IPF)

图12 低密度钢热变形组织的晶界

图13 低密度钢热变形组织中晶界取向差的分布

图14 Z值不同条件下的动态再结晶的体积分数

图15 低密度钢热变形组织的TEM照片

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