新型马氏体耐磨钢的冲击磨料磨损性能

Impact Abrasive Wear Resistance of New Type Martensitic Wear Resistant Steel

对自行研制的新型ADVANS 450W马氏体耐磨钢分别进行了(900,1 050,1 200)℃×0.5 h油淬+300℃×2 h空冷处理,然后在MLD-10型动载磨料磨损试验机上,在3.5 J冲击能量下分别进行了石英砂和棕刚玉磨料下的冲击磨料磨损试验,并与ZGMn13钢进行了对比;用X射线衍射仪测定了试验前后钢中残余奥氏体含量的变化,用扫描电镜分析了磨损机理。结果表明:在900℃奥氏体化淬回火得到的试验钢能够获得较高的硬度,强韧性匹配较理想,在不同类型磨料下其耐磨性都优于其它处理条件和ZGMn13钢的,磨损试验后磨损面硬度明显提高,且存在一定深度的塑性变形层,钢中的残余奥氏体转变为马氏体;在棕刚玉磨料下,磨损机理以显微切削为主,在石英砂磨料下,磨损机理以塑变疲劳为主。

The self-developed new type ADVANS 450W martensitic wear resistant steel was heated to 900, 1 050 and 1 200 ℃ for 30 min for austenizati.on respectively, then oil quenched and tempered at 300 ℃ for 2 h, then aircooled. The impact abrasive wear resistance of the steel relative to high manganese steel ZGMnl3 was investigated on MLD-10 type impact abrasive wear tester under 3.5 J impact energy, brown corundum abrasive and quartz sand abrasive respectively. The volume fraction of retained austenite in the wear surface of steel was measured by using X-ray diffraction before and after wear test, the wear mechanism was analyzed by SEM. The results show that a higher hardness and good matching of strength and toughness were able to achieved in the steel after austenitizing at 900 ℃, then quenching and tempering. The impact abrasive wear resistance of the steel was always superior to that of high manganese steel under different abrasive and conditions. The hardness of worn surface on all the steel samples was obviously heightened after wear test, the certain depth plastic deformation layer was observed on worn surface, the retained austenite transformed to martensite. The primary wear mechanism was micro-cutting under the condition of brown corundum abrasive, and which was plastic deformation and micro-fatigue under the condition of quartz sand abrasive.