Mechanical Property and Formability of 580DP and 700DP Hot-Rolled Dual Phase Steel
摘 要
研究了580DP与700DP热轧双相钢的拉伸性能、扩孔性能和成形极限曲线,并与QStE550TM热轧微合金高强钢的进行对比;采用成形极限经验公式和MK模型对成形极限曲线进行预测,并与试验结果进行对比;对热轧双相钢的成形极限曲线最低点的主应变进行拟合,进而对成形极限经验公式进行修正。结果表明:与QStE550TM钢相比,580DP与700DP钢的断后伸长率和加工硬化指数较高,屈强比较低,加工性能较好;580DP与700DP钢的扩孔率均低于QStE550TM钢的,扩孔性能较差;580DP钢的成形极限曲线高于700DP钢的,且均高于QStE550TM钢的,热轧双相钢的成形性能较好;成形极限经验公式与MK模型均不能很好地预测580DP与700DP钢的成形极限曲线;采用修正的成形极限经验公式计算得到的热轧双相钢的成形极限曲线与试验结果较吻合,其中580DP钢的相对误差小于5.6%,700DP钢在平面应变区域的相对误差小于9.4%,在其他区域的相对误差小于6.5%。
Abstract
The tensile properties, hole-expansion properties and forming limit curves of 580DP and 700DP hot-rolled dual phase steel were studied and compared with those of QStE550TM hot-rolled microalloyed high strength steel. The forming limit curves were predicted by forming limit empirical formulas and MK model, and compared with test results. The main strains at valley point of forming limit curves for hot-rolled dual phase steels were fitting to modify the forming limit empirical formula. The results show that compared with QStE550TM steel, 580DP and 700DP steel had higher percentage elongation after fracture and work-hardening index and lower yield ratios, indicating better processability. The hole-expansion ratios of 580DP and 700DP steel were smaller than that of QStE550TM steel, and the hole-expansion properties were worse. The forming limit curve of 580DP steel was higher than that of 700DP steel, and both were higher than that of QStE550TM steel, indicating hot-rolled dual phase steel had better formability. The empirical formulas and MK model did not predict the forming limit curves of 580DP and 700DP steel well. The forming limit curves of hot-rolled dual phase steels calculated by modified forming limit empirical formula agreed with the test results; the relative error was less than 5.6% for 580DP steel, and less than 9.4% in plane strain region and less than 6.5% in other regions for 700DP steel.
中图分类号 TG142.1 DOI 10.11973/jxgccl202007020
所属栏目 物理模拟与数值模拟
基金项目
收稿日期 2020/4/2
修改稿日期 2020/5/22
网络出版日期
作者单位点击查看
备注陈维晋(1985-),男,江苏南京人,工程师,硕士
引用该论文: CHEN Weijin,YIN Sheng,PEI Xinhua. Mechanical Property and Formability of 580DP and 700DP Hot-Rolled Dual Phase Steel[J]. Materials for mechancial engineering, 2020, 44(7): 92~97
陈维晋,殷胜,裴新华. 580DP与700DP热轧双相钢的力学性能与成形性能[J]. 机械工程材料, 2020, 44(7): 92~97
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【3】董春明, 张红梅, 刘振宇, 等. 终轧温度对热轧双相钢微观形貌的影响[J]. 机械工程材料, 2007, 31(3):17-19.
【4】殷胜, 蔡晓辉, 朱红丹. 600 MPa低硅Nb-Ti微合金化优质3.5 mm热轧双相钢板的开发[J].特殊钢,2014,35(5):47-49.
【5】孟宪堂, 郭子峰, 李飞, 等. 首钢590 MPa级高疲劳寿命轮辐用钢的研制[J]. 锻压技术, 2015, 40(4):128-132.
【6】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.
【7】陈继平,董玉庆,钱健清,等.热轧马氏体和贝氏体双相钢扩孔性能及机理[J].中南大学学报(自然科学版),2014,45(2):395-400.
【8】ERDOGAN M.The effect of new ferrite content on the tensile fracture behaviour of dual phase steels[J].Journal of Materials Science,2002,37(17):3623-3630.
【9】吴青松,祝洪川,王立新,等.汽车用不同显微组织高强钢板的扩孔性能[J].机械工程材料,2016,40(6):42-45.
【10】祝洪川, 王有禄, 魏星, 等.高强低合金钢成形极限曲线的计算[J]. 钢铁研究, 2017, 45(6):63-66.
【11】KEELER S P, BACKOFEN W A. Plastic instability and fracture in sheets stretched over rigid punches[J]. ASM Transactions Quarterly, 1963, 56(11):25-48.
【12】桂良进, 张晓前, 周驰, 等. 各向异性高强钢成形极限曲线有限元预测[J]. 清华大学学报(自然科学版), 2019, 59(1):66-72.
【13】陈新平, 蒋浩民. 汽车钢板胀形区成形极限图的预测与验证[J]. 金属成形工艺, 2003, 21(6):86-88.
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