Effect of austenitizing temperature on microstructure and mechanical properties of medium carbon spring steel

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X Pub Date : 2025-08-04 DOI:10.1016/j.mlblux.2025.100251

Qian Yu , Yuliang Zhao , Feiyu Zhao

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Abstract

The influence of austenitizing temperature on the microstructure and mechanical properties of medium carbon spring steel was systematically studied. Microstructural characterization showed that decreasing the austenitizing temperature from 900 °C to 860 °C effectively refined prior austenite grains from 8.8 μm to 5.3 μm, reduced martensite block thickness from 0.9 μm to 0.7 μm, and increased the fraction of high-angle grain boundaries (HAGBs) from 70 % to 76 %. Crystallographic variant analysis revealed increased boundary densities for V1&V2, V1&V3(V5), V1&V4, and V1&V6 pairs in the 860 °C sample with refined PAGS, along with elevated frequencies of V1&V3(V5) and V1&V6 pairs classified as HAGBs, consistent with the K-S orientation relationship. These results demonstrate that reducing the austenitizing temperature from 900 °C to 860 °C significantly affects martensite block size, HAGB fraction, and crystallographic variant pairs, leading to enchanced yield strength from 1563 MPa to 1648 MPa and total elongation from 9.3 % to 9.7 %.

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奥氏体化温度对中碳钢组织和力学性能的影响

系统研究了奥氏体化温度对中碳弹簧钢组织和力学性能的影响。显微组织表征表明，当奥氏体化温度从900℃降低到860℃时，奥氏体晶粒从8.8 μm细化到5.3 μm，马氏体块厚度从0.9 μm减小到0.7 μm，高角度晶界（HAGBs）比例从70%增加到76%。晶体变异分析显示，在860°C的样品中，经过改进的PAGS， V1&V2、V1&V3（V5）、V1&；V4和V1&；V6对的边界密度增加，并且V1&；V3（V5）和V1&；V6对被分类为HAGBs的频率增加，与K-S取向关系一致。结果表明，当奥氏体化温度从900℃降低到860℃时，马氏体块尺寸、HAGB分数和晶体变异对显著提高，屈服强度从1563 MPa提高到1648 MPa，总伸长率从9.3%提高到9.7%。

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