基于原位高能X射线衍射定量分析退火温度对中锰钢加工硬化的影响

doi:10.11900/0412.1961.2024.00432

金属学报 DOI: 10.11900/0412.1961.2024.00432

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基于原位高能X射线衍射定量分析退火温度对中锰钢加工硬化的影响

季泽¹,高宏伟²,张明赫¹,冯运莉¹,李时磊²,王沿东²

1 华北理工大学冶金与能源学院唐山 063210

2 北京科技大学新金属材料国家重点实验室北京 100083

Quantitative Analysis of the Effect of Annealing Temperature on the Work-hardening Behavior of Medium-Mn Seel Based on in-situ High-energy X-ray Diffraction

JI Ze ¹, GAO Hongwei ², ZHANG Minghe ¹, FENG Yunli ¹, LI Shilei ², WANG Yandong ²

1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China

2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,

Beijing 100083, China

引用本文:

季泽高宏伟张明赫冯运莉李时磊王沿东. 基于原位高能X射线衍射定量分析退火温度对中锰钢加工硬化的影响[J]. 金属学报, DOI: 10.11900/0412.1961.2024.00432.

全文: PDF(4176 KB)

摘要: 为了深入理解TRIP效应对中锰钢组成相载荷配分的影响，通过原位高能X射线衍射(HE-XRD)技术研究了不同退火温度制备的中锰钢在室温变形时的加工硬化行为。采用Olson和Cohen模型拟合了形变诱导马氏体相变的转变动力学曲线。根据组成相的晶格应变和体积分数，计算得到了组成相的相应力和贡献的流变应力。加工硬化率被分解为四个因素，即奥氏体相应力的变化率、奥氏体与马氏体之间的载荷配分、马氏体形成速率以及铁素体与奥氏体之间的载荷配分，其中奥氏体相应力的变化率对加工硬化行为的影响最大。对每个因素对加工硬化行为的影响进行了定量分析和叠加，计算结果与实验获得的加工硬化率吻合较好。了吕德斯带扩展过程中奥氏体转变为马氏体的体积分数线性增加。这些发现将有助于深入理解中锰钢的变形行为。

关键词 ：高能X射线衍射, 中锰钢, TRIP效应, 加工硬化, 层错能

Abstract：Due to the relatively low mechanical properties of the first generation of Advanced high-strength steels (AHSSs) and high cost and the associated production difficulties of the second generation of AHSSs, the majority of the research efforts are thus now shifting towards medium-Mn steels with 5-12 wt.% Mn, which provides an excellent strength-ductility combination yet at a reasonable production cost. The synchrotron-based high-energy X-ray diffraction (HE-XRD) technique has provided a new method for characterizing the microstructure evolution of metallic materials during loading. In the current work, the micromechanical and work hardening behavior of Fe-0.1C-10Mn-2Al steel deformation at room temperature at critical annealing temperatures of 625°C, 650°C, 675°C and 700°C was investigated by in-situ HE-XRD. The total elongation (TE) and the product of the ultimate tensile stress and total elongation (PSE) reached a maximum of 45.6% and 53% at the critical annealing temperature of 650°C, respectively. The transition kinetics of residual austenite (RA) were fitted by the Olson and Cohen (OC) models. According to the lattice strain and the corresponding volume fraction, the phase stress and flow stresses contributed by the constituent phases are obtained. The work hardening rate is decomposed into four influencing factors related to the TRIP effect and load distribution, namely the austenite corresponding force, the load distribution between austenite and martensite, the rate of martensite formation, and the load distribution between ferrite and austenite. The influence of each contributor on the work-hardening behavior was quantitatively analyzed and superimposed, and the calculated results were in good agreement with the experimental work-hardening rate obtained from the true stress-strain curve. Finally, it is found that the LB promotes the transformation of austenite to martensite, and the SFE of RA is highly correlated with the annealing temperature. A linear relationship between the volume fraction of austenite to martensite during LB propagation and the SFE of RA is unrivaled. These findings facilitate an in-depth understanding of the deformation behavior in medium-Mn steels.

Key words： High-energy X-ray diffraction medium-Mn steel TRIP effect work-hardening stacking fault energy

收稿日期: 2024-12-20

ZTFLH:

TG142

基金资助:基于同步辐射的高强塑积含Cu/Ni中锰钢的复合强韧化机理研究;中锰钢局域变形带内禀机制与组织结构关联性研究;第二相强化型 CoNiV 中熵合金相界面结构及力学行为研究;第二相错配度对CoNiV中熵合金组织与力学行为影响

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