固溶处理对Fe-30Mn-10Al-1C低密度钢组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.07.020

金属热处理 ›› 2022, Vol. 47 ›› Issue (7): 114-119.DOI: 10.13251/j.issn.0254-6051.2022.07.020

固溶处理对Fe-30Mn-10Al-1C低密度钢组织及力学性能的影响

付锡彬^1,2, 孟少博¹, 刘文胜¹, 张可¹, 李昭东², 曹燕光², 章小峰¹, 雍岐龙²

1.安徽工业大学冶金工程学院, 安徽马鞍山 243032;
2.钢铁研究总院有限公司工程用钢研究院, 北京 100081

收稿日期:2022-03-16 修回日期:2022-05-23 出版日期:2022-07-25 发布日期:2022-08-12
通讯作者: 张可,副教授,博士,E-mail:huzhude@yeah.net
作者简介:付锡彬(1997—),男,硕士研究生,主要研究方向为先进钢铁材料,E-mail:fxb18325583721@126.com。

Effect of solution treatment on microstructure and mechanical properties of Fe-30Mn-10Al-1C low density steel

Fu Xibin^1,2, Meng Shaobo¹, Liu Wensheng¹, Zhang Ke¹, Li Zhaodong², Cao Yanguang², Zhang Xiaofeng¹, Yong Qilong²

1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China;
2. Research Institute of Structural Steels, Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2022-03-16 Revised:2022-05-23 Online:2022-07-25 Published:2022-08-12

摘要/Abstract

摘要： 借助OM、SEM、TEM、拉伸试验等手段研究了固溶温度对热轧Fe-30Mn-10Al-1C低密度钢组织及力学性能的影响,并阐明了其组织演变和力学性能变化的原因。结果表明,试验钢经热轧及固溶处理后组织均为奥氏体单相组织,固溶处理后出现大量退火孪晶;950~1050 ℃固溶时,平均晶粒尺寸随温度的升高由34 μm增长至138 μm;随着固溶温度的升高,微米κ碳化物逐渐固溶消失,但由于较低成核势垒和较大的过冷度,固溶后仍有大量纳米κ碳化物生成;试验钢轧态的抗拉强度和屈服强度最高,分别为1188 MPa和1123 MPa,但伸长率最低为33%;随固溶温度的升高,试验钢抗拉强度和屈服强度逐渐降低,伸长率则不断升高,1050 ℃时抗拉强度和屈服强度分别为853 MPa和726 MPa,伸长率达到61%。

关键词: 低密度钢, 固溶温度, 奥氏体, 组织, 力学性能

Abstract: Effect of solution temperature on microstructure and mechanical properties of hot-rolled Fe-30Mn-10Al-1C low density steel was studied by means of OM, SEM, TEM and tensile test. The reasons for microstructure evolution and mechanical properties change were clarified. The results show that the Fe-30Mn-10Al-1C low-density steel is austenitic single-phase structure after hot rolling and solution treatment. A large number of annealing twins appear after solution treatment. The average grain size increases from 34 μm to 138 μm when the temperature is increased between 950-1050 ℃. With the increase of solution temperature, micron κ carbide disappears gradually. However, due to the extremely low nucleation barrier and high degree of subcooling, a large amount of nano-κ carbides are still formed after solution treatment. The tensile strength and yield strength of the as-rolled tested steel are the highest, reaching 1188 MPa and 1123 MPa, respectively, but the elongation is the lowest (33%). With the increase of solution temperature, the tensile strength and yield strength of the tested steel gradually decrease, and the elongation continuously increases. At 1050 ℃, the tensile strength and yield strength are 853 MPa and 726 MPa, respectively, and the elongation reaches 61%.

Key words: low density steel, solution temperature, austenite, microstructure, mechanical properties

中图分类号:

TG142.1

付锡彬, 孟少博, 刘文胜, 张可, 李昭东, 曹燕光, 章小峰, 雍岐龙. 固溶处理对Fe-30Mn-10Al-1C低密度钢组织及力学性能的影响[J]. 金属热处理, 2022, 47(7): 114-119.

Fu Xibin, Meng Shaobo, Liu Wensheng, Zhang Ke, Li Zhaodong, Cao Yanguang, Zhang Xiaofeng, Yong Qilong. Effect of solution treatment on microstructure and mechanical properties of Fe-30Mn-10Al-1C low density steel[J]. Heat Treatment of Metals, 2022, 47(7): 114-119.

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固溶处理对Fe-30Mn-10Al-1C低密度钢组织及力学性能的影响

Effect of solution treatment on microstructure and mechanical properties of Fe-30Mn-10Al-1C low density steel

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