摘要
以汽车装配式凸轮为对象,通过粉末锻造制备了样块。研究了锻造工艺对Fe-0.8C-2Cu材料密度、孔隙和显微组织的影响。将锻造试样在650℃去应力退火,然后进行淬火加低温回火处理,研究了材料在150、200、250℃三种回火温度下的摩擦磨损性能。结果表明:锻造可以大幅提高粉末冶金材料的密度,可提高至7.78 g/cm^(3),可达真密度的99%,烧结和锻造试样的组织主要为珠光体和铁素体,经过锻造后材料晶粒细化无微裂纹。150℃回火试样的磨损方式随着载荷的增加从磨粒磨损逐步转变为剥层磨损,250℃回火试样以黏着磨损为主,200℃回火试样的磨损方式以磨粒磨损为主,试样的摩擦系数较稳定,耐磨性较好。
Taking the assembly cam for automobile as the object, the sample blocks were prepared by powder forging.The effects of forging process on the density, porosity and microstructure of the Fe-0.8C-2Cu material were studied. The forged samples were annealed at 650℃, and then quenching and low temperature tempering treatment were carried out. The friction and wear properties of the material at 150, 200 and 250℃ were studied. The results show that the density of powder metallurgy material can be greatly increased by forging, and the density of forgings can be increased to 7.78 g/cm^(3), which can reach 99% of the true density. The microstructure of sintered and forged samples is mainly pearlite and ferrite. After forging,the micro-cracks of the material disappear and the grain size is refined. With the increase of load, the wear mode of the sample tempered at 150℃ is gradually changed from abrasive wear to stripping wear. The main wear mode of the specimen tempered at 250℃ is adhesive wear. The wear mode of the sample tempered at 200 ℃ is mainly abrasive wear, the friction coefficient of the sample is stable and the wear resistance is good.
作者
李靖
陈荣发
曹培
耿浩然
龚孜宇
赵毅红
包四平
董金扬
LI Jing;CHEN Rongfa;CAO Pei;GENG Haoran;GONG Ziyu;ZHAO Yihong;BAO Siping;DONG Jinyang(School of Mechanical Engineering,Yangzhou University,Yangzhou 225001,China;Porite Yangzhou Technology&Industry Co.,Ltd.,Yangzhou 225127,China)
出处
《热加工工艺》
北大核心
2021年第17期36-40,共5页
Hot Working Technology
基金
扬州市创新能力建设项目-高等院校合作专项项目(YZ2017294)。
关键词
粉末锻造
显微组织
热处理
摩擦磨损
powder forging
microstructure
heat treatment
friction and wear
