This study aimed to investigate the fracture and hardening behaviors of transformation induced plasticity (TRIP) steel at different heat-treatments using the uniaxial tensile test and the necking correction method to study the effects of various heat treating procedures and strain rates in the microstructural evaluation, mechanical properties, and fracture behavior of the investigated steel. The uniaxial tensile tests were performed on samples heat-treated through different procedures and strain rates in the range of 0.005–5 s⁻¹. It was observed that the strain rate slightly affects the formability of TRIP steel in different heat-treatment procedures. The obtained results showed that the H3 sample in which the samples austenitized at 900 °C for 22 min then soaked at 400 °C for 1 h and finally quenched in oil at 50 °C and cooling at ambient temperature had the highest strain fracture. The nucleation and growth of voids, as well as the dynamic equilibrium between strain hardening and recovery, were reasons for fracture strain increment from 0.005 to 0.1. However, fracture strain decreased at the strain rate of 0.1–5 s⁻¹ due to the decrease of ductility. Also, TRIP steel characterizations were used for modeling the displacement and stress of the anti-roll bar by ANSYS 19.2 parametric language and Solid-Works. The displacement and stress results of TRIP steel were compared to SAE Class 550 and Class 700 grades of steel.

Graphic abstract

中文翻译：

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热轧过共析 Si-Mn TRIP 钢断裂行为的建模与试验研究：热处理效应

本研究旨在使用单轴拉伸试验和颈缩校正方法研究相变诱导塑性 (TRIP) 钢在不同热处理下的断裂和硬化行为，以研究各种热处理工艺和应变速率对显微组织评价的影响，所研究钢的力学性能和断裂行为。对通过不同程序和应变速率在 0.005-5 s ^-1范围内热处理的样品进行单轴拉伸试验. 据观察，应变速率对 TRIP 钢在不同热处理程序中的成形性有轻微影响。所得结果表明，H3 样品在 900 ℃下奥氏体化 22 分钟，然后在 400 ℃下保温 1 小时，最后在 50 ℃ 油中淬火并在环境温度下冷却的 H3 样品具有最高的应变断裂。空洞的形核和增长，以及应变硬化和恢复之间的动态平衡，是断裂应变增量从 0.005 到 0.1 的原因。然而，断裂应变以 0.1-5 s ^-1的应变速率降低由于延展性下降。此外，TRIP 钢特征用于通过 ANSYS 19.2 参数化语言和 Solid-Works 对防倾杆的位移和应力进行建模。将 TRIP 钢的位移和应力结果与 SAE 550 级和 700 级钢进行比较。

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