Predictions of the Mechanical Properties and Microstructure Evolution of High Strength Steel in Hot Stamping

文献类型： 外文期刊

第一作者： Cui, Junjia

作者： Cui, Junjia;Li, Chunfeng;Lei, Chengxi;Xing, Zhongwen;Ma, Shumei

作者机构：

关键词： high strength steel;hot stamping;mechanical properties;microstructure

期刊名称：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE （ 影响因子：1.819； 五年影响因子：1.895 ）

ISSN： 1059-9495

年卷期： 2012 年 21 卷 11 期

页码：

收录情况： SCI

摘要： Hot stamping is an innovative operation in metal-forming processes which virtually avoids the cracking and wrinkling of high strength steel (HSS) sheets. Examining the phase transformation and mechanical properties of HSS by means of experiments is challenging. In this article, a numerical model of the hot stamping process including forming, quenching, and air cooling was developed to reveal the microstructure evolution and to predict the final mechanical properties of hot-stamped components after multi-process cycles. The effects of the number of process cycles and the holding times on the temperature of HSS were examined using the model. The microstructure evolution of HSS under variable holding times is illustrated. The mechanical properties, particularly hardness and tensile strength, were predicted. It was found that the martensitic content increased with increasing holding time, and the martensitic content of the formed component at the flange and end was higher than for the sidewall, and lowest for the bottom. The hardness trend was consistent with the martensitic content. After six process cycles, the predictive errors of the model for hardness and tensile strength were acceptable for practical applications in engineering. Comparison between the predicted results and the experiment results showed that the developed model was reliable.

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