一种新型高强塑积异质冷轧中锰钢的力学性能

doi:10.11901/1005.3093.2019.315

材料研究学报

2019, Vol. 33

Issue (12): 927-934 DOI: 10.11901/1005.3093.2019.315

研究论文

本期目录 | 过刊浏览

一种新型高强塑积异质冷轧中锰钢的力学性能

张喜亮, 侯华峰, 刘涛(

), 刘宏基, 周骞, 赵雷杰, 刘晓艳, 崔好选

河北工程大学材料科学与工程学院邯郸 056038

Microstructure and Mechanical Properties of a Novel Heterogeneous Cold-rolled Medium Mn Steel with High Product of Strength and Ductility

ZHANG Xiliang, HOU Huafeng, LIU Tao(

), LIU Hongji, ZHOU Qian, ZHAO Leijie, LIU Xiaoyan, CUI Haoxuan

College of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China

引用本文:

张喜亮, 侯华峰, 刘涛, 刘宏基, 周骞, 赵雷杰, 刘晓艳, 崔好选. 一种新型高强塑积异质冷轧中锰钢的力学性能[J]. 材料研究学报, 2019, 33(12): 927-934.
Xiliang ZHANG, Huafeng HOU, Tao LIU, Hongji LIU, Qian ZHOU, Leijie ZHAO, Xiaoyan LIU, Haoxuan CUI. Microstructure and Mechanical Properties of a Novel Heterogeneous Cold-rolled Medium Mn Steel with High Product of Strength and Ductility[J]. Chinese Journal of Materials Research, 2019, 33(12): 927-934.

全文: PDF(24557 KB) HTML

摘要:

使用原位电子背散射衍射(EBSD)和球差透射电镜(ACTEM)等手段，研究了新型异质结构中锰TRIP钢在拉伸过程中微观组织的演变机制和力学性能。结果表明，在680℃退火后的实验钢中生成了多形貌、多尺度的异质奥氏体结构(颗粒状、块状、片层状奥氏体)和铁素体组织，其抗拉强度为1272 MPa，总延伸率为54.5%，强塑积高达69.3 GPa·%。在拉伸过程中C/Mn含量较低的颗粒状奥氏体先发生相变，而C/Mn含量较高的块状和片层状奥氏体在较大的应变范围内逐渐发生相变，从而导致高强度与高塑性的良好匹配。结果还表明，马氏体相变优先在奥氏体晶界/相界附近的区域形核。与晶粒尺寸相比，C/Mn元素对奥氏体稳定性的作用更重要。

关键词 ：金属材料, 中锰TRIP钢, 微观组织, 异质结构, 力学性能, 原位EBSD

Abstract：

The mechanical properties of a novel heterogeneous cold-rolled medium Mn steel were investigated by means of mechanical testers, in situ EBSD (electron back-scattered diffraction) and SDTEM (spherical differential transmission electron microscope). The results show that the sample annealed at 680°C consists of multiple microstructure of austenites (granular shape, blocky shape, and lath-like shape) and fine ferrite grains. The heterogeneous steel has ultimate tensile strength of 1.27 GPa, total elongation of 54.5% and product of strength and elongation of 69.3 GPa·%. During tensile deformation the granular-shape austenite with a low C/Mn content preferentially transforms into martensite ahead of the blocky-shape and lath-like austenite with high C/Mn content, and the multi-type microstructure of austenite with various stability lead to a continuous TRIP effect in a large strain region, which is responsible for the excellent properties of the heterogeneous medium Mn steel. In addition, austenite grain boundaries or austenite/ferrite interfaces are the preferred nucleation zone of martensite during deformation. The effect of Mn/C content on austenite stability readily overrides those of grain size.

Key words： metallic materials medium Mn TRIP steel microstructure heterogeneous structure mechanical properties in situ EBSD

收稿日期: 2019-06-25

ZTFLH:

TG113

基金资助:国家自然科学基金(51874114);国家自然科学基金(51701059)

作者简介: 张喜亮，男，1983年生，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.315 或 https://www.cjmr.org/CN/Y2019/V33/I12/927

图1 不同退火试样的工程应力应变曲线

表1 退火和回火处理后试验钢的拉伸测试结果

图2 A68试样的TEM微观组织形貌

图3 A68试样拉伸过程中微观结构的演变

图4 A68试样奥氏体拉伸过程中的反极图(拉伸轴方向)

图5 A68试样的微观结构和元素分布

图6 异质中锰TRIP钢各工艺阶段的微观组织演变示意图

图7 A66、A68和A70试样的加工硬化率和相应奥氏体含量的变化

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