摘要
为提高金属材料的耐磨性,以高铬铸铁为实验基材,采用多元合金化法制备了实验材料,并观察与测试了实验基材和合金元素Nb、V、Ti不同加入量时材料的铸态组织和冲击磨损率。结果表明：实验基材的铸态组织为粗长条状奥氏体＋粗大的六角形M_7C_3碳化物组成,其冲击磨损率最大,高达6.9 mg/min;随着合金元素的加入量分别在0.10%~0.70%之间逐步增加,实验材料的铸态组织主要由奥氏体＋M_7C_3碳化物＋Nb C、VC和Ti C碳化物组成。合金元素的加入量分别为≤0.20%时和≤0.70%时的铸态组织较为粗大,相应的冲击磨损率也较大,分别为5.4 mg/min和6.3 mg/min;当合金元素的加入量分别为0.40%时,奥氏体呈细短的条状,M_7C_3型碳化物呈圆钝短小的条或块状,Nb C、VC和Ti C碳化物呈微小的颗粒状均匀的分布在基体中,其冲击磨损率最小,仅为4.5 mg/min,冲击耐磨性相对于实验基材提高了1.5倍以上。
In order to improve the wear resistance of metallic materials,taking high chromium cast iron base material as experiment material,adopting multiple alloying to prepare the experiment materials,the microstructure and impact wear rate of the experimental base material and the material with different addition content alloy elements Nb,V,Ti were observed and tested.The results show that the as-cast microstructure of experimental base material is coarse long strips of austenite and bulky hexagonal M_7C_3 carbide,its maximum impact wear rate is 6.9 mg/min.The experimental materials is mainly composed of austenite,M_7C_3 carbide,Nb C,VC and Ti C carbides when the addition content of alloy elements is in the range of 0.10% ~0.70%.When the content is less than 0.20% or more than 0.70%,the structure is relatively thick and the impact wear rate is bigger,which is 5.4 and 6.3 mg/min,respectively.When the addition amount of alloy elements is 0.40%,respectively,the austenite is thin and short strip type,the M_7C_3 carbide show obtuse short article or block,Nb C,VC and Ti C tiny granular carbides are evenly distributed in the matrix,their minimum impact wear rate is 4.5 mg/min.Compared with the experimental base material,the impact wear resistance can be improved by more than 1.5 times.
出处
《铸造技术》
CAS
北大核心
2016年第10期2081-2084,共4页
Foundry Technology
