锻压技术

形变和固态相变耦合DP800钢材料的晶粒细化

英文标题：Grain refinement of DP800 steel with deformation and solid phase transformation coupling

作者：赵茂俞黄晓峰黄波蒋克荣蒙争争

分类号：TG161

出版年,卷(期):页码：2021,46(11):238-243

摘要：

金属材料的晶粒尺寸和均匀分布会显著影响材料的力学性能，而形变和固态相变耦合能够有效地细化DP800（Dual Phase）钢材料的晶粒。结合加载形变冷却耦合工艺，研究了合理的加热、保温工艺参数来细化晶粒。在临界温度为740 ℃时，DP800钢材料发生固态相变，在该温度下的保温时间分别设定为10、12、14、16和18 min。将加热保温处理后的试样放入模具内，通过丝杠-螺母装置对试样进行刚性加压，使试样发生形变。然后，在保压状态下自然冷却试样，通过形变和固态相变耦合，细化DP800钢材料的晶粒。在此基础上，观察试样的微观结构形貌、测试试样的力学性能，试样的微观组织为铁素体和马氏体，其晶粒细小、均匀分布。最终获得了最佳的热处理工艺参数，并与原材料试样对比，经形变和相变耦合处理的DP800钢材料的屈服强度降低了70 MPa，抗拉强度提高了225 MPa，伸长率提高了4.8 %，表明其力学性能和塑性成形性获得了显著提高。

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.

基金项目：

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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