含<i>δ</i> 铁素体Mn-Al系TRIP钢冷轧退火过程的组织性能

doi:10.11901/1005.3093.2018.131

材料研究学报

2018, Vol. 32

Issue (3): 177-183 DOI: 10.11901/1005.3093.2018.131

研究论文

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含δ 铁素体Mn-Al系TRIP钢冷轧退火过程的组织性能

胡智评¹, 许云波¹(

), 刘慧², 王乐²

1 东北大学轧制技术及连轧自动化国家重点实验室沈阳 110819;
2 山东钢铁股份有限公司钢铁研究院济南 250101;

Microstructure Evolution and Mechanical Properties of Cold-rolled Mn-Al TRIP Steel with δ Ferrite

Zhiping HU¹, Yunbo XU¹(

), Hui LIU², Le WANG²

1 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;
2 Research Instituteof Iron and Steel of Shandong Iron and Steel Group, Jinan 250101, China;

引用本文:

胡智评, 许云波, 刘慧, 王乐. 含δ 铁素体Mn-Al系TRIP钢冷轧退火过程的组织性能[J]. 材料研究学报, 2018, 32(3): 177-183.
Zhiping HU, Yunbo XU, Hui LIU, Le WANG. Microstructure Evolution and Mechanical Properties of Cold-rolled Mn-Al TRIP Steel with δ Ferrite[J]. Chinese Journal of Materials Research, 2018, 32(3): 177-183.

全文: PDF(5692 KB) HTML

摘要:

研究了临界区退火温度和退火时间对含δ铁素体的Mn-Al系冷轧TRIP钢(Fe-0.18C-6.4Mn-2.8Al)的组织和性能演变行为的影响。结果表明,随着临界区退火温度的提高和退火时间的延长,实验钢的残余奥氏体(RA)含量和强塑积呈现先增大后减小的趋势。在750℃退火2 min实验钢的组织由δ铁素体、临界区铁素体及残余奥氏体组成,其RA含量为24.7%,抗拉强度为773 MPa,断后延伸率39.4%,强塑积为30.46 GPa%。RA主要集中在粗大δ铁素体与原马氏体边界、原马氏体区域内再结晶铁素体晶界周围以及粗大δ铁素体内的亚晶界附近。

关键词 ：金属材料, 含δ铁素体TRIP钢;, 力学性能, 残余奥氏体

Abstract：

The microstructure evolution and mechanical properties of a cold-rolled Mn-Al transformation-induced plasticity (TRIP) steel with δ ferrite were investigated after annealed at different intercritical annealing temperature for different time. The results show that as the intercritical annealing temperature and time going up, the content of retained austenite (RA) and the product of strength and elongation (PSE) increased first and then decrease. The microstructure of the steel after annealing at 750℃ for 2 min consists of δ ferrite, intercritical ferrite and 24.7% retained austenite, which exhibited a tensile strength of 773 MPa, elongation of 39.4% and the product of strength and elongation of 30.46 GPa%. RA mainly exits at the boundaries between bulky δ ferrite and original martensite, around the recrystallization ferrite from original martensite area, and around the sub-grain boundaries inside δ ferrite.

Key words： metal materials TRIP steel with δ ferrite; mechanical property retained austenite

收稿日期: 2017-10-09

ZTFLH:

TG113

基金资助:国家自然科学基金(51174059,51404155,U1260204)、中央高校基本科研业务费项目(N130407003)、新世纪优秀人才支持计划(NCET-13-0111)、辽宁省高等学校优秀人才支持计划(LR2014007)

作者简介:

作者简介胡智评,男,1989年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.131 或 https://www.cjmr.org/CN/Y2018/V32/I3/177

图1 轧制工艺规程

图2 不同Al含量实验钢的相图

图3 不同奥氏体化温度下实验钢的组织

图4 冷轧实验钢在不同温度退火后的SEM形貌

表1 不同临界区退火温度钢的力学性能及残余奥氏体含量

图5 在750℃退火2 min实验钢的TEM形貌

图6 在750℃退火2 min实验钢的EBSD结果

图7 在750℃退火不同时间钢的SEM形貌

表2 不同临界区等温退火时间钢的力学性能和残余奥氏体含量

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