退火时间对Fe-2.0Mn-4.7Al-0.4C低密度高强度钢组织和性能的影响

doi:10.13251/j.issn.0254-6051.2024.11.016

金属热处理 ›› 2024, Vol. 49 ›› Issue (11): 112-117.DOI: 10.13251/j.issn.0254-6051.2024.11.016

退火时间对Fe-2.0Mn-4.7Al-0.4C低密度高强度钢组织和性能的影响

彭侠超¹, 唐恩², 张香云¹

1.兰州理工大学材料科学与工程学院, 甘肃兰州 730050;
2.浙江工贸职业技术学院光电制造学院, 浙江温州 325003

收稿日期:2024-05-22 修回日期:2024-09-18 出版日期:2024-11-25 发布日期:2025-01-09
通讯作者: 唐恩,教授,博士,E-mail:tangen@zjitc.edu.cn
作者简介:彭侠超(1996—),男,硕士研究生,主要研究方向为金属材料,E-mail:171483242@qq.com。
基金资助:
国家自然科学基金(52061024,52161027);甘肃省自然科学基金(21JR7RA260);兰州理工大学红柳优秀青年人才支持计划

Effect of annealing time on microstructure and properties of Fe-2.0Mn-4.7Al-0.4C low density high strength steel

Peng Xiachao¹, Tang En², Zhang Xiangyun¹

1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou Gansu 730050, China;
2. College of Optoelectronic Manufacturing, Zhejiang Industry ＆ Trade Vocational College, Wenzhou Zhejiang 325003, China

Received:2024-05-22 Revised:2024-09-18 Online:2024-11-25 Published:2025-01-09

摘要/Abstract

摘要： 通过JMat-Pro模拟软件确定了Fe-2.0Mn-4.7Al-0.4C低密度钢退火温度为860 ℃,通过光学显微镜、扫描电镜、电子万能材料试验机等检测方法研究了退火时间对热轧态Fe-2.0Mn-4.7Al-0.4C钢的组织及力学性能的影响。结果表明,热轧态Fe-2.0Mn-4.7Al-0.4C钢经过退火处理,其组织由δ铁素体、α铁素体、马氏体、珠光体和渗碳体转变为δ铁素体、珠光体和残留奥氏体。退火保温120 min时,拉伸断口形貌显示试样由脆性断裂转变为韧性断裂,材料抗拉强度为515.6 MPa,屈服强度为361.0 MPa,伸长率达到最大值35.4%,强塑积达到18.3 GPa·%,综合力学性能达到最好。而退火时间过长,达到180 min时,组织晶粒长大并发生聚集,位错运动消失,导致材料韧性降低,增加了材料的脆性,断口以韧窝和较为平滑的解理面为主。

关键词: 低密度钢, 退火时间, 断口形貌, 显微组织, 力学性能

Abstract: Annealing temperature of Fe-2.0Mn-4.7Al-0.4C steel was determined to be 860 ℃ by using JMatPro simulation software. The effect of annealing time on the microstructure and mechanical properties of the hot-rolled Fe-2.0Mn-4.7Al-0.4C steel was studied by means of optical microscope, scanning electron microscope, and electronic universal material testing machine. The results show that after annealing treatment, the microstructure of the hot-rolled Fe-2.0Mn-4.7Al-0.4C steel transforms from δ ferrite, α ferrite, martensite, pearlite, and cementite to δ ferrite, pearlite, and retained austenite. When annealed for 120 min, the tensile fracture morphology of the specimen shows a transition from brittle fracture to ductile fracture. The tested steel has the best comprehensive mechanical properties with tensile strength of 515.6 MPa, yield strength of 361.0 MPa, maximum elongation of 35.4%, and strength-elongation product of 18.3 GPa·%. However, when the annealing time is too long to reach 180 min, the grain grows and aggregates, the dislocation movement disappears, resulting in a decrease in material toughness and an increase in material brittleness. The fracture surface is mainly composed of ductile dimples and relatively smooth cleavage surfaces.

Key words: low density steel, annealing time, fracture morphology, microstructure, mechanical properties

中图分类号:

TG142

彭侠超, 唐恩, 张香云. 退火时间对Fe-2.0Mn-4.7Al-0.4C低密度高强度钢组织和性能的影响[J]. 金属热处理, 2024, 49(11): 112-117.

Peng Xiachao, Tang En, Zhang Xiangyun. Effect of annealing time on microstructure and properties of Fe-2.0Mn-4.7Al-0.4C low density high strength steel[J]. Heat Treatment of Metals, 2024, 49(11): 112-117.

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退火时间对Fe-2.0Mn-4.7Al-0.4C低密度高强度钢组织和性能的影响

Effect of annealing time on microstructure and properties of Fe-2.0Mn-4.7Al-0.4C low density high strength steel

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