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首页> 外文期刊>Kovove materialy >Effect of bainite volume fraction on mechanical properties of a ferrite-bainite-martensite steel
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Effect of bainite volume fraction on mechanical properties of a ferrite-bainite-martensite steel

机译：贝氏体体积分数对铁氧体 - 贝氏体 - 马氏体钢力学性能的影响

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Nowadays, triple phase ferrite-bainite-martensite steels have found widespread applications in automotive industry. The volume fraction of different phases is the key factor in determining mechanical properties of these steels. This paper investigates the effect of bainite volume fraction on microstructure and mechanical properties of a triple phase steel. Hence, an inter critical annealing treatment at 780 degrees C was followed by austempering treatment at 400 degrees C for different times. Microstructures were analysed using optical and scanning electron microscopy, and mechanical properties were also investigated by a tensile test. The results showed that the kinetics of austempering treatment had a good adaptation with JMAK equation. It was also found that increment of bainite phase from 0 to 42 vol.% decreased ultimate tensile strength from 952 to 578 MPa, but from 5.7 to 12 vol.% ductility increased. Results also showed that triple phase steels with 14.9 and 24.5 vol.% bainite demonstrated three-stage work hardening behaviour while other samples obeyed two-stage work hardening mechanism.
机译：如今，三相铁素体 - 贝氏体 - 马氏体钢在汽车工业中发现了广泛应用。不同阶段的体积分数是确定这些钢的机械性能的关键因素。本文研究了贝氏体体积分数对三相钢的微观结构和机械性能的影响。因此，在780摄氏度下进行临界反应处理，然后在400℃下进行常见的治疗不同时间。使用光学和扫描电子显微镜分析微结构，并通过拉伸试验研究机械性能。结果表明，奥斯德医疗治疗动力学与JMAK方程具有良好的适应。还发现，从0到42体积的贝氏体相增加。％降低了952至578MPa的最终拉伸强度，但为5.7-12体积。％延展性增加。结果还表明，具有14.9和24.5体积的三相钢。％Bainite展示了三级工作的硬化行为，而其他样品遵守了两级工作的硬化机制。

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