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

参考文献：

[1]Chen X, Huang G S, Liu S S, et al.Grain refinement and mechanical properties of pure aluminum processed by accumulative extrusion bonding[J]. Transactions of Nonferrous Metal Society of China, 2019, 29(3）：437-447.

[2]杜林秀，熊明鲜，姚圣杰，等.利用相变进行低碳钢的亚微米化[J].金属学报，2007，（1）：59-63.

Du L X, Xiong M X, Yao S J, et al. Submicron crystallization of low carbon steels through transformation [J]. Acta Metallurgica Sinica, 2007, (1): 59-63.

[3]Yang G S, Lee J K, Jang W Y. Effect of grain refinement on phase transformation behavior and mechanical properties of Cu-based alloy [J]. Transactions of Nonferrous Metal Society of China, 2009, 19(4): 979-983.

[4]索涛，李玉龙.等径通道挤压中晶粒细化影响因素的研究进展[J].材料科学与工程学报，2004，22（1）：132-137.

Suo T, Li Y L. Progress in influence factor of grain refinement during equal-channel angular pressing[J]. Journal of Materials Science and Engineering, 2004, 22(1): 132-137.

[5]吴卫华. 铜及铜合金晶粒细化方法的研究现状[J].湖南冶金，2006，34(5)：44-48.

Wu W H. Research present situation of grain refinement methods of copper and copper alloys[J]. Hunan Metallurgy, 2006, 34(5): 44-48.

[6]孙海斌，左秀荣，仲志国，等.铝合金晶粒细化方法的研究现状及最新动向[J].热加工工艺，2005，34(12)：71-74.

Sun H B, Zuo X R, Zhong Z G, et al. Study situation and progress of grain refinement method in aluminium alloys[J]. Hot Working Technology, 2005,34(12): 71-74.

[7]谌岩，李雅莉，刘建华，等.4 GPa压力处理对T8钢在加热过程中固态相变动力学的影响[J].物理学报，2012，61（19）：1-5.

Chen Y, Li Y L, Liu J H,et al. Effect of 4 GPa pressure treatment on the solid state transformation kinetics of T8 steel in heating process[J]. Acta Physica Sinica, 2012, 61(19): 1-5.

[8]孙彩娜，陈佩丽，张恒华.高温形变对E36船板钢γα相变的影响[J].材料热处理学报，2013，34（9）：132-139.

Sun C N, Chen P L, Zhang H H. Effect of high temperature deformation on characteristics of γα phase transition of an E36 ship plate steel[J]. Transactions of Materials and Heat Treatment, 2013, 34（9）: 132-139.

[9]刘宗昌，计云萍.马氏体相变研究的最新发展（三）[J].热处理技术与装备，2014，35（3）：1-6.

Liu Z C, Ji Y P. Latest advances in study on martensite phase transformation(3)[J]. Heat Treatment Technology and Equipment, 2014, 35(3): 1-6.

[10]邓德安，张彦斌，李索，等.固态相变对P92钢焊接接头残余应力的影响[J].金属学报，2016，52（4）：394-402.

Deng D A, Zhang Y B, Li S, et al. Influence of solidstate phase transformation on residual stress in P92 steel welded joint[J]. Acta Metallurgica Sinica, 2016, 52(4): 394-402.

[11]Gao X Y, Wang H Y, Xing L, et al. The synergistic effects of ultrafine grains and nano-size Cu-rich precipitates on the mechanical properties of DP steels [J]. Materials Science and Engineering: A, 2020,805：140547.

[12]Rana A K,Paul S K, Dey P P. Effect of individual phase properties and volume fractions on the strain partitioning, deformation localization and tensile properties of DP steels[J]. Sādhanā, 2020, 45(1): 1-13.

[13]周乐育. 高强度含铌热轧双相钢组织性能柔性控制研究[D].北京：北京科技大学，2008.

Zhou L Y. Research on Flexible Control of Microstructure And Properties of High Strength Nb Bearing Hot-rolled Dual Phase Steel[D]. Beijing: University of Science and Technology Beijing, 2008.

[14]Srivastava A K, Patel N K, Kumar B R, et al. Strengthductility tradeoff in dual phase steel tailored via controlled phase transformation[J]. Journal of Materials Engineering and Performance, 2020,29:2783-2791.

[15]谢磊磊，唐荻，江海涛，等.汽车用先进高强钢的成形性能[J].塑性工程学报，2013，20(1)：84-88.

Xie L L, Tang D, Jiang H T, et al. Study on formability of advanced high strength steel for automobiles[J]. Journal of Plasticity Engineering, 2013, 20(1): 84-88.

[16]于昆. 5 GPa压力处理对低合金冷却过程中固态相变动力学的影响[J].材料热处理技术，2010，41（6）：168-172.

Yu K. Effect of 5 GPa pressure treatment on solid state phase transformation kinetics in low alloy steel during cooling process[J]. Material & Heat Treatment, 2010, 41(6): 168-172.

[17]Guan R G，Zhao Z Y， Chao R Z,et al. Heat tranfer and grain refining mechanism during melt treatment by cooling sloping plate [J]. Acta Metallurgica Sinica, 2012, 25(4): 320-328.

[18]刘春成，姚可夫，高国峰，等.应力应变对马氏体相变动力学及相变塑性影响的研究[J].金属学报，1999，35（11）：1125-1129.

Liu C C, Yao K F, Gao G F, et al. Study to the effect of stress and strain on martensite transformation kinetics and transformation plasticity[J]. Acta Metallurgica Sinica, 1999, 35(11): 1125-1129.

[19]唐明华，刘志义，胡双开，等.ZrC/奥氏体相界面形变诱导相变动力学[J].中南大学学报，2010，41（1）：120-124.

Tang M H, Liu Z Y, Hu S K,et al. Transitional dynamics of deformation induced phase transformation at ZrC/austenitic interface[J]. Journal of Central South University:Science and Technology, 2010, 41(1): 120-124.

[20]刘宗昌，任慧平，计云萍.固态相变原理新论[M].北京：科学出版社，2015.

Liu Z C, Ren H P, Ji Y P. New Principle of Solid State Phase Transformation[M]. Beijing: Science Press, 2015.

[21]刘峰，刘欢欢，马亚珠.固态相变的动力学描述[J].西北工业大学报，2010，30（2）：143-149.

Liu F, Liu H H, Ma Y Z. Kinetic description for solid state phase transformation[J]. Journal of Xi′an Technological University, 2010, 30(2): 143-149.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】