Transactions of Materials and Heat Treatment

Title：Grain refinement of DP800 steel with deformation and solid phase transformation coupling

Authors： Zhao Maoyu Huang Xiaofeng Huang Bo Jiang Kerong Meng Zhengzheng

Unit： Hefei University Anhui JACASSET Bodywork Equipment Co. Ltd.

KeyWords： solid phase transformation deformation and phase transformation coupling grain refinement pressure holding time

ClassificationCode：TG161

year,vol(issue):pagenumber：2021,46(11):238-243

Abstract：

The grain size and uniform distribution of metal materials significantly affect the mechanical properties for the materials, and the deformation and solid phase transformation coupling can effectively refine the grains of DP800 (Dual Phase) steel material. Therefore, the reasonable heating and heat preservation process parameters were studied to refine grains by combining with the coupled process of loading, deformation and cooling. At the critical temperature 740 ℃, the DP800 steel material underwent a solid phase transformation, and the holding times at this temperature were set to 10, 12, 14, 16 and 18 min respectively. Then, the samples after heating and heat preservation treatment were put into the mold, which were rigidly pressurized to deform by the screw-nut device. Next, the sample was naturally cooled under the pressure, and the grains of the DP800 steel material were refined under the deformation and solid phase transformation coupling. On this basis, the microstructure morphology of the sample was observed, and the mechanical properties of the sample were tested. It is found that the microstructure of the sample is ferrite and martensite with fine grains and uniform distribution. Finally, the best heat treatment process parameters were obtained, and compared with the raw material samples, the yield strength of the DP800 steel material after the deformation and phase transformation coupling treatment was reduced by 70 MPa, the tensile strength was increased by 225 MPa, and the elongation was increased by 4.8%. The results show that the mechanical properties and plastic formability are significantly improved.

Funds：

2018安徽省自然科学基金后续项目(1800069035)

作者简介：赵茂俞(1969-)，男，博士，教授，E-mail：chhmyzhao@126.com

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