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Effect of Aging Process on the Strain Rate Sensitivity in V-Containing TWIP Steel
Metals ( IF 2.9 ) Pub Date : 2021-01-10 , DOI: 10.3390/met11010126
Shaoheng Sun , Zhiyong Xue

The dynamic tensile behavior of the twinning-induced plasticity (TWIP) steel with the vanadium carbide is investigated at different strain rates of 10−4, 10−3, 10−2 and 0.05 s−1. Microstructure characterization, carried out using back scatter electron diffraction (EBSD) and transmission electron microscopy (TEM), shows a homogeneous face center cubic structured matrix with uniformly dispersed vanadium carbide. The vanadium carbide is controlled by the aging temperature and time. The best comprehensive mechanical properties are achieved when the tested steel is aged at 550 °C for 5 h. With the increase of strain rate, the tensile strength and work hardening rate decrease, and the tested material shows negative strain rate sensitivity. This would be due to an increase in stacking fault energy caused by temperature rise by adiabatic heating, which must suppress the formation of twinning. On the other hand, the strain rate sensitivity is affected by dynamic strain aging (DSA). With the increase of strain rate, the DSA weakens, which causes negative strain rate sensitivity. The tensile strength and strain rate sensitivity value both increase first and then decrease with the increase of vanadium carbide size. This is because the tensile strength is mainly affected by the vanadium carbide. In addition to the vanadium carbide, the strain rate sensitivity is also affected by the amount of solute atom (V and C) during the dynamic strain aging process.

中文翻译:

时效工艺对含钒TWIP钢应变率敏感性的影响

与碳化钒的孪晶诱发塑性(TWIP)钢的动态拉伸行为在10个不同的应变率进行了研究-4,10 -3,10 -2和0.05秒-1。使用背散射电子衍射(EBSD)和透射电子显微镜(TEM)进行的微结构表征显示出具有均匀分散的碳化钒的均质面心立方结构基体。碳化钒由时效温度和时间控制。当被测钢在550°C时效5 h时,可获得最佳的综合机械性能。随着应变率的增加,抗拉强度和加工硬化率降低,被测材料表现出负应变率敏感性。这是由于绝热加热引起的温度升高引起的堆垛层错能量的增加,必须抑制孪晶的形成。另一方面,应变率灵敏度受动态应变老化(DSA)影响。随着应变率的增加,DSA减弱,导致负应变率敏感性。抗拉强度和应变率敏感度值随碳化钒尺寸的增加先增大后减小。这是因为抗拉强度主要受碳化钒的影响。除碳化钒外,应变速率敏感性还受动态应变时效过程中溶质原子(V和C)的数量的影响。
更新日期:2021-01-10
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