Research on Hot Stamping-Joining Integrated Process Feasibility of High-strength Steel/CFRP and Sample Bending Performance

doi:10.3969/j.issn.1004-132X.2021.24.010

Abstract

Abstract: A joining and forming integrated process for high-strength steel/CFRP multi-material parts was developed, where the hot stamping technology was used to join the high-strength steel and CFRP prepreg. The preparation processes of multi-material composite parts under different quenching temperatures during hot stamping were studied and microscopic observation of the steel sheets was conducted. Then the three-point bending tests for the multi-material composite parts were carried out. The microscopic observation results show that the microstructure of the steel sheets is full martensite. The three-point bending tests indicate that the bending angles of the samples with no CFRP, with two layers CFRP, and with four layers CFRP are as 130°, 110° and 104°, respectively. Besides, the force-displacement curves of the bending tests were integrated to calculate the energy absorption of the samples. The results show that the energy absorption of the samples with no CFRP, with two layers CFRP, and with four layers CFRP are as 9410 J, 9692 J, and 10050 J. The energy absorption of the samples with two-layer CFRP and the samples with four-layer CFRP increase by 2.9% and 6.8% compared with the samples without CFRP.

Key words: carbon fiber reinforced polymer(CFRP), high-strength steel, hot stamping, multi-material part, bending performance, energy absorption performance

摘要： 提出一种高强钢/碳纤维增强复合材料(CFRP)的多材料零件连接成形一体化加工工艺，利用热冲压工艺对高强钢和CFRP预浸料进行连接并成形高强钢/CFRP多材料零件。研究热冲压过程中不同的淬火温度下多材料复合板的制备工艺，并对试样中钢板进行微观观测，最后对复合件进行弯曲试验。微观检测结果表明，该工艺下钢板组织为全马氏体组织。三点弯曲试验结果表明，未铺设CFRP试样、铺设2层CFRP试样和铺设4层CFRP试样的弯曲角度分别为130°、110°和104°。对弯曲试验的力位移曲线进行积分，计算试样的能量吸收量，得到如下结论：未铺设CFRP试样、铺设2层CFRP试样和铺设4层CFRP试样的能量吸收量分别为9410 J、9692 J和10 050 J；铺设2层CFRP的试样和铺设4层CFRP的试样相比于未铺设CFRP的试样，能量吸收量分别增加2.9%和6.8%。

关键词: 碳纤维增强复合材料（CFRP）, 高强钢, 热冲压, 多材料试件, 弯曲性能, 吸能性能

CLC Number:

ZHU Bin, LIU Wang, TIAN Feng, LIU Yong, ZHANG Yisheng, . Research on Hot Stamping-Joining Integrated Process Feasibility of High-strength Steel/CFRP and Sample Bending Performance[J]. China Mechanical Engineering, 2021, 32(24): 2975-2980.

朱彬, 刘旺, 田丰, 刘勇, 张宜生, . 高强钢/碳纤维增强复合材料热冲压-连接一体化工艺可行性及试样弯曲性能研究[J]. 中国机械工程, 2021, 32(24): 2975-2980.

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