锻压技术

高强钢的热塑性流动规律

英文标题：Thermoplastic flow law of highstrength steel

单位：1.中国机械科学研究总院集团有限公司先进成形技术与装备国家重点实验室 2. 北京科技大学机械工程学院

分类号：TG142.1

出版年,卷(期):页码：2021,46(12):216-223

摘要：

针对两种应用在汽车的高强硼钢材料，通过力学试验和微观组织试验相结合的方法研究其热塑性流动规律，为高强钢热成形提供工艺参数依据。采用Gleeble1500热模拟机进行高温热拉伸试验，研究在变形温度为600~800 ℃、应变速率为0.01~1 s-1条件下两种材料热成形时的热塑性流动性；进行冷却速度试验，并对试验后的板材件进行单向拉伸试验和金相组织分析，进一步研究材料在热环境下的热塑性流动规律。结果表明，随着应变速率的增加，材料的塑性流动应力随之増加，加工硬化现象也越来越明显，变形温度的升高使材料的流动应力水平明显下降；对于AlSi镀层钢板，提高变形温度，有助于马氏体的形成和材料冷却后强度及硬度的提升。

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.

基金项目：

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

参考文献：

[1] 王存宇，杨洁，常颖，等. 先进高强度汽车钢的发展趋势与挑战[J]. 钢铁，2019，54(2)：1-6.

Wang C Y, Yang J, Chang Y，et al. Development trend and challenge of advanced high strength automobile steels[J]. Iron & Steel, 2019，54(2):1-6.

[2] 马廷涛，庄厚川，金科，等. 高强钢材料车身轻量化研究[J]. 汽车工艺与材料，2019，(5)：1-5:11.

Ma T T, Zhuang H C, Jin K，et al. Research on lightweight of highstrength steel body[J].Automobile Technology & Material, 2019，(5):1-5:11.

[3] 李扬，刘汉武，杜云慧，等. 汽车用先进高强钢的应用现状和发展方向[J]. 材料导报，2011，25(13)：101-104，109.

Li Y, Liu H W, Du Y H，et al. Application and development of AHSS in automobile industry[J]. Materials Review, 2011，25(13):101-104，109.

[4] 闫君杰，王强. 汽车用新型低合金高强钢及其热处理工艺研究[J]. 热加工工艺，2018，47(12)：165-168.

Yan J J, Wang Q. Study on new type low alloy high strength steel for automobile and its heat treatment process[J]. Hot Working Technology, 2018，47(12):165-168.

[5] 刘腾，朱政强. 第三代汽车用中锰钢研究现状[J]. 兵器材料科学与工程，2019，42(6)：102-108.

Liu T, Zhu Z Q. Research status of medium manganese steel for the 3rd gernation automobile sheet[J]. Ordnance Material Science and Engineering, 2019，42(6):102-108.

[6] Karbasian H, Tekkaya A E. A review on hot stamping[J]. Journal of Materials Processing Technology, 2010, 210(15):2103-2118.

[7] 李强，郭彪，吴工，等. Fe2Cu0.5C粉末烧结钢高温拉伸流动应力及预测[J]. 锻压技术，2020，45(8)：195-204.

Li Q, Guo B, Wu G，et al. Flow stress and prediction on powder sintered steel Fe2Cu0.5C during high temperature tensile[J]. Forging & Stamping Technology, 2020，45(8):195-204.

[8] 万荣春，付立铭，王学双. 1180 MPa级超高强钢慢速率拉伸延迟开裂性能[J]. 锻压技术，2019，44(3)：140-144.

Wan R C, Fu L M, Wang X S. Delayed fracture performance of 1180 MPa ultra highstrength steel by slow strain rate tension[J]. Forging & Stamping Technology, 2019，44(3):140-144.

[9] 闫永明，张灵，王倩，等. 1000 MPa级高破碎性钢的动态本构模型[J]. 金属热处理，2020，45(8)：70-75.

Yan Y M, Zhang L, Wang Q，et al. Dynamic constitutive model of 1000 MPa highfragmentation steel[J]. Heat Treatment of Metals, 2020，45(8):70-75.

[10]Barcellona A，Palmeri D．Effect of plastic hot deformation on the hardness and continuous cooling transformations of 22MnB5 microalloyed boron steel[J]．Metallurgical and Materials Transactions A，2009，40(5): 1160-1174.

[11]王凯，朱彬，王义林，等. 热冲压钢AlSi镀层形貌动态演化及形变开裂特征[J]. 塑性工程学报，2020，27(9)：181-185.

Wang K, Zhu B, Wang Y L，et al. Dynamic morphology evolution and deformation cracking characteristics of AlSi coating on hot stamping steel[J]. Journal of Plasticity Engineering, 2020，27(9):181-185.

[12]Zasimchuk E, Turchak T, Chausov N. Hydrodynamic plastic flow in metal materials[J]. Results in Materials, 2020,(6):1-7.

[13]谷诤巍，姜超，单忠德，等. 超高强度钢板冲压件热成形工艺[J]. 汽车工艺与材料，2009,(4)：15-17.

Gu Z W, Jiang C, Shan Z D，et al. Hot forming process of ultrahigh strength steel sheet stamping parts[J]. Automobile Technology & Material, 2009,(4):15-17.

[14]金学军，龚煜，韩先洪，等. 先进热成形汽车钢制造与使用的研究现状与展望[J]. 金属学报，2020，56(4)：411-428.

Jin X J, Gong Y, Han X H，et al. A review of current state and prospect of the manufacturing and application of advanced hot stamping automobile steels[J]. Acta Metallurgica Sinica, 2020，56(4)：411-428.

[15]Mori K, Bariani P F, Behrens B A，et al. Hot stamping of ultrahigh strength steel parts[J]. CIRP Annals, 2017，66(2):755-777.

[16]Li N, Lin J, Balint D S，et al. Modelling of austenite formation during heating in boron steel hot stamping processes[J]. Journal of Materials Processing Technology, 2016，237(1):394-401.

[17]Huang Y C，Lin Y C，Jiao D，et al.Hot tensile deformation behaviors and constitutive model of 42CrMo steel[J].Materials and Design，2014，53(1): 349-356.

[18]张帅，杨德斌. 热冲压成形汽车用高强钢板的组织与性能研究[J]. 热加工工艺，2019，48(7)：145-147.

Zhang S，Yang D B. Study on microstructure and properties of hot stamping high strength steel sheet for automobile[J]. Hot Working Technology, 2019，48(7):145-147.

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