Engine valve and seat insert wear study with a simulator

查看全文 作　　者：[1]Y.S.Wang;[1]S.Narasimhan 机构地区：[1]Eaton Corp.,Engine Components Operations 19218 B Drive South,Marshall, MI 49068 出　　处：《Science China Mathematics》索引2001年第44卷第S1期,共7页 摘　　要：The demands on higher performance and the increasing use of alternative fuels chal-lenge engine valves now with greater wear problems than before. A seat wear simulator was builtto evaluate the compatibility and wear of valve and seat insert. The rig test results have been suc-cessfully correlated with engine test results. In this study, intake valves made from Sil 1 materialwere treated with salt bath nitride processes and tested against six different insert materials. Wearresistance of these combinations was ranked and compared to the Sil 1 valve without nitriding.The test results demonstrate that nitriding improved valve seat wear resistance. In the total valveseat recession ranking, the combination of nitrided Sil 1 valve against T 400 insert exhibited theleast total recession among the nineteen combinations of valve and insert tested. The results indi-cate that the valve seat wear mechanisms are a complex combination of adhesion and shearstrain. The nitrides in the compound layer of nitrided valves gave strong atomic bonding, higherhardness, compressive residual stresses, and possible low friction, thus resulted in the superiorwear performance. 关 键 词：ENGINE VALVE nitride SEAT INSERT VALVE SCAT WEAR mechanism WEAR simulation