Transactions of Materials and Heat Treatment

Title：Thermoplastic flow law of highstrength steel

Authors： Sun Fuzhen1 2 Liu Zizhi1 Zhang Quanda1 Ji Rigele1

Unit： 1. State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group 2. School of Mechanical Engineering University of Science and Technology Beijing

KeyWords： boron steel tensile test thermoforming metallographic analysis thermo plastic flow law

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2021,46(12):216-223

Abstract：

For the two kinds of high-strength boron steel materials used in automobiles, the thermoplastic flow laws were studied by combining with mechanical test and microstructure test to provide a basis of process parameters for thermoforming of high-strength steel. Then, the high temperature thermal tensile tests were conducted by thermal simulator Gleeble-1500, and the plastic flow properties of the two kinds of materials during the thermoforming at deformation temperature of 600-800 ℃ and strain rate of 0.01-1 s-1 were studied. Furthermore, the cooling rate test was carried out, and the uniaxial tensile test and the metallographic analysis of tested sheet parts were carried out to further study the thermo plastic flow laws of the material under the thermal environment. The results show that as the strain rate increases, the plastic flow stress of the material increases, the work hardening phenomenon becomes more and more obvious, and the increasing of the deformation temperature makes the flow stress level of the material drop significantly. For Al-Si coated steel sheet, increasing the deformation temperature helps the formation of martensite and the improvement of the strength and hardness after the material is cooled.

Funds：

国家科技重大专项（2019ZX04004001）

作者简介：孙福臻（1983-），男，硕士，高级工程师 E-mail：sfz523@163.com 通信作者：刘子知（1994-），男，硕士，助理工程师 E-mail：2399725786@qq.com

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