渗硼工艺对汽车用45CrNiMoV热锻模具钢性能的影响  

Influence of Boronizing Process on Properties of Hot Forging Die Steel 45CrNiMoV for Automobile

作　　者：李小明[1] Li Xiaoming(The Department of Mechanical Engineering,Sichuan Vocational and Technical College,Suining 629000)

机构地区：[1]四川职业技术学院机械工程系,遂宁629000

出　　处：《特殊钢》2021年第1期57-60,共4页Special Steel

摘　　要：研究了850~950℃3~6 h渗硼处理的汽车发动机曲轴锻造用模具钢的显微硬度、冲击韧性、耐磨性能以及物相组成和微观结构。研究结果表明,925℃渗硼4 h后的样品性能较优,模具钢渗硼层最大HV显微硬度值1712,渗层厚度58.6μm,400℃和24℃冲击韧性值分别为39 J·cm-2和27 J·cm-2,90 min摩擦试验后的磨损量6.7 mg。物相组成显示渗硼层主相为Fe2B,显微结构中可以明显看见渗硼后的渗硼层、过渡层以及基体。The microhardness,impact toughness,wear resistance,phases composition and microstructure of die steel for auto engine crankshaft forging of boroning process at 850 ~950 ℃ 3 ~6 h are studied.The research results show that the steel boronized at 925 ℃ for 4 h has better performance,that is the maximum HV microhardness value of the boronizing layer 1712,the thickness of the boronizing layer 58.6 μm,and the impact toughness value at 400 ℃ and 24 ℃ respectively 39 J·cm-2 and 27 J·cm-2,and the wear amount after 90 min friction test 6.7 mg of die steel.The phase composition shows that the main phase of the boronizing layer is Fe2 B,while the boriding layer,transition layer and matrix microstructure are obviously observed in microstructure.

关 键 词：渗硼工艺 汽车模具钢 性能 微观结构 

分 类 号：U465.11[一般工业技术—材料科学与工程] TG142.4[机械工程—车辆工程] TG156.87[交通运输工程—载运工具运用工程]