汽车发动机缸体用铸铁材料的性能研究  

Study on the Properties of Casting Iron Used for Automobile Engine Cylinder Block

作　　者：付秋林[1] 蒋世应[1] 王振华[1] FU Qiu-lin;JIANG Shi-ying;WANG Zhen-hua(Yibin Vocational and Technical College, Yibin 644003, Sichuan, Chin)

机构地区：[1]宜宾职业技术学院,四川宜宾644003

出　　处：《铸造》2018年第4期354-356,共3页Foundry

摘　　要：通过添加一定量的Mn和Cr,对HT350进行改性,采用工频熔炼炉熔炼铸铁。研究了Mn和Cr添加量对铸铁性能的影响,结果表明:当添加0.6%Mn,0.4%Cr时,铸铁性能最佳,材料的抗拉强度为425.7 MPa,硬度为HBS 243,当载荷为700 N,摩擦时间为20 min时样品磨损量百分比为2.15%,2 000次热疲劳试验后主裂纹长度为0.63 mm。Mn和Cr元素的添加有利于组织内部珠光体的数量增加和细化,同时在表面形成MnFe_2O_3和Cr_2O_3的复合氧化膜,有助于材料力学性能、耐磨性能以及抗热疲劳性能的提高。HT350 casting iron was modified by adding Mn and Cr, the material was melted by main frequency induction furnace. The influence of Mn and Cr elements on the properties of the casting iron was researched. The results show that with the addition of 0.6% Mn and 0.4% Cr, material can achieve the optimal properties. The tensile strength is 425.7 MPa, HBS hardness is 243. With 700N loads and 20 min fraction time, the wearing loss rate is 2.15%, and the main crack length after thermal fatigue shock for 2 000 times is 0.63 mm. The addition of Mn and Cr elements is useful for increasing the number ofpearlite and refining the grains. Simultaneously, the multiple oxidation layers of MnFe2O3 and Cr2O3 can form on the casting iron surface, which is of benefit to the increase of mechanical properties, wearing property and thermal fatigue resistance.

关 键 词：汽车 发动机缸体 铸铁 合金元素 性能 

分 类 号：TG143.2[一般工业技术—材料科学与工程]