Effect of heat treatment and foam iron on the dry sliding frictional properties of A356-SiCp/Fe
Vacuum-assisted fusion infiltration process is used to prepare foam iron skeleton as the reinforcement of SiCp/A359 composite material A359-SiCp/Fe.The microhardness and high-temperature wear properties of the two materials before and after foam iron enhancement and T6 heat treatment were compared to make clear the effect of foam iron and T6 heat treatment on the enhancement of high-temperature wear properties of A359-SiCp/Fe composite material.The use of SEM was combined with the EDS to characterize the observation of the surface wear morphology,the abrasive debris morphology,as well as wear of the longitudinal cross-section,in order to explore the high-temperature wear mechanism of the material at different temperatures.The results in-dicated that A359-SiCp/Fe was prepared using vacuum-assisted fusion infiltration process,and the Al-Fe inter-face was well bonded,forming not only mechanical bonding,but also chemical metallurgical bonding.The wear amount of A359-SiCp/Fe at 300-500℃was only 25%-75%of that of the unreinforced alloy,which effectively increased the use temperature in high-temperature environments by more than 50-100℃.T6 heat treatment could significantly improve the hardness of the Al matrix and the degree of metallurgical bonding at the Al-Fe interface,and the effect was more pronounced at 300-500℃,effectively improving the material's high-tempera-ture wear resistance.The grinding form of the material was affected by the temperature,which is abrasive wear at 100℃.When the friction temperature reached 350℃,the surface appeared delamination and spalling,and adhesive wear was began at 500℃.
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