回火温度及时间对4330V钢力学性能的影响  

Influence of Tempering Temperature and Time on Mechanical Properties of 4330V Steel

作　　者：陈卫东 王济生 孔永平 CHEN Weidong;WANG Jisheng;KONG Yongping(Henan Zhongyuan Heavy Forging Co.Ltd.,Jiyuan 454650,China;Henan Yulong Science and Technology Research Institute Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]河南中原重型锻压有限公司,河南济源454650 [2]河南省豫隆科学技术研究院有限公司,河南郑州450001

出　　处：《河南科技》2023年第17期41-45,共5页Henan Science and Technology

摘　　要：【目的】探讨回火温度及时间对4330V低合金结构钢力学性能的影响,并探寻4330V钢的最佳回火工艺,从而提高4330V钢的产品性能。【方法】通过不同的回火温度及回火时间对4330V钢进行处理,对其强度、硬度、韧性及塑性的变化情况进行分析。【结果】随着回火温度的升高,4330V钢的屈服强度、抗拉强度及硬度都有所下降,韧性和塑性都有所升高;随着回火时间的延长,4330V钢的强度及硬度均有一定程度的下降,冲击吸收能量和塑性反而有一定程度的升高。【结论】当回火温度为640℃及700℃时,温度过高会造成过回火;当回火温度为500℃时,温度过低,回火不充分;当回火温度为620℃回火120 min后,4330V钢的各种性能匹配较好。4330V钢在500℃和580℃回火后,其断口形貌主要以准解理断裂为主,此时钢材的延伸率最低;当回火温度提高到640℃时,其断口形貌主要以细小韧窝为主,此时的断裂方式为韧性断裂,且随着回火温度的升高,韧窝也变得越大越深,材料的塑性和韧性不断提高。[Purposes]This paper aims to explore the effects of tempering temperature and time on the mechanical properties of 4330V low alloy structural steel,and to explore the optimal tempering process for 4330V steel to improve its product performance.[Methods]4330V steel was treated at different tempering temperatures and times,and the changes in strength,hardness,toughness and plasticity were analyzed.[Findings]Experimental results show that with the increase of tempering temperature,the yield strength,tensile strength and hardness of 4330V steel all decrease,while the toughness and plasticity increase.With the prolongation of tempering time,the strength and hardness of 4330V steel decreased to a certain extent,and the impact absorption energy and plasticity increased to a certain extent.[Conclusions]When tempering at 640℃and 700℃,the temperature is too high to cause over-tempering.When tempering at 500℃,the temperature is too low and the tempering is insufficient.When tempered at 620℃for 120 min,the various properties of 4330V steel are well matched.After tempering at 500℃and 580℃,the fracture morphology of 4330V steel is mainly quasi-cleavage fracture,and the elongation of the alloy is the lowest at this time.When the tempering temperature is increased to 640℃,the fracture morphology is mainly composed of small dimples,and the fracture mode at this time is ductile fracture,and with the increase of tempering temperature,the dimples become larger and deeper,the plasticity and toughness of the material continue to improve.

关 键 词：4330V钢 力学性能 回火温度 回火时间 

分 类 号：TG161[金属学及工艺—热处理]