热冲压钢B1500HS的淬后综合力学性能研究
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摘要
通过开展单向拉伸试验、三点弯曲试验和夏比冲击试验,对硼钢B1500HS热冲压后的拉伸、弯曲、冲击韧性等综合力学性能进行了系统研究,并讨论了不同淬火速度对B1500HS综合力学性能的影响。结果表明:B1500HS热冲压后具有强度高、塑性较差的特点;当B1500HS在高于临界全马氏体转变的淬火冷速冷却时,淬火速度对B1500HS的综合力学性能仍有一定影响。淬火冷速越快,其抗拉强度越高,吸能性越好;但冷弯性能越差,延伸率越低。
The uniaxial tensile test,three-point bending test and Charpy impact test were carried out to study the comprehensive mechanical properties such as tensile,bending performance and impact toughness of boron steel B1500 HS after hot stamping.The influence of different quenching rates of B1500 HS was studied.The experimental results indicated that B1500 HS had the characteristics of high strength and poor plasticity after hot stamping.When the quenching rate of B1500 HS exceeded the critical quenching rate for full martensitic transformation,it still had an effect on the comprehensive mechanical properties of B1500 HS.The faster the quenching rate was,the better the tensile strength and energy absorption were,however,the cold bending performance and elongation got worse.
The uniaxial tensile test,three-point bending test and Charpy impact test were carried out to study the comprehensive mechanical properties such as tensile,bending performance and impact toughness of boron steel B1500 HS after hot stamping.The influence of different quenching rates of B1500 HS was studied.The experimental results indicated that B1500 HS had the characteristics of high strength and poor plasticity after hot stamping.When the quenching rate of B1500 HS exceeded the critical quenching rate for full martensitic transformation,it still had an effect on the comprehensive mechanical properties of B1500 HS.The faster the quenching rate was,the better the tensile strength and energy absorption were,however,the cold bending performance and elongation got worse.
引文
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[3]辛沛森,陆彬,韩先洪.汽车车身节点刚度和强度数值分析[J].模具技术,2013(4):1-6.
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[5]左治江,文亮,李智勤,等.DP600高强钢板V型弯曲回弹性能研究[J].锻压技术,2014,39(11):16-19.
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[7]WANG J,ENLOE C,SINGH J,et al.Effect of prior austenite grain size on impact toughness of press hardening steel[J].SAE International Journal of Materials&Manufacturing,2016,9(2):488-493.
[8] YING L,LU J D,CHANG Y,et al.Optimization evaluation test of strength and toughness parameters for hot-stamped high strength steels[J].Journal of Iron and Steel Research,2013,20(11):51-56.
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[10]葛德龙.超高强度钢冷弯特性和回弹的实验研究与数值仿真[D].上海:上海交通大学,2014.
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[12]姜鸿亮,王晶,孙雪娇,等.钢板冲击试样断口分离现象分析[J].物理测试,2017,35(3):39-44.
[13]孙岭,王爱霞,杜燕臻.钢板冲击试样断口分析[J].中国稀土学报,2006,24(10):570-573.