【摘要】 本文对奥氏体中锰钢、钒强化含胞状碳硼化物奥氏体中锰钢和钛强化含胞状碳硼化物奥氏体中锰钢在高应力和低应力条件下相对耐磨性进行了测定。结果表明,在低应力叶片式磨料磨损条件下,两种含硼中锰钢的相对耐磨性显著高于奥氏体中锰钢;而在高应力的冲击式磨料磨损条件下,前者的相对耐磨性则明显低于后者。结果说明,引起三种钢耐磨顺序的变化的主要原因是低应力条件下的磨损机制与高应力条件下的磨损机制不同。低应力下以表面疲劳剥落为主,高应力下以犁削,脆断为主。本文的试验结果也说明在低应力条件下以钛代钒来强化胞状硼化物,可获得更高的耐磨性和更大的经济效益。更多还原

【Abstract】 The relative wear resistance of austenitic medium manganese steels, two of which containing carboborides and hardened by V and Ti respectively, was measured through the tests of impact abrasive wear (high stress) and leaf abrasive wear (low stress). The results indicate that the relative wear resistance of the two steels containing carboborides is considerably higher than that of boron-free austenitic manganese steels under lower stress wear condition. On the contrary, under higher stress wear condition, quite the opposite is the case. The results show that the main cause which brought about the change in the wear resistance order of these steels is the difference in wear mechanism between low stress and high stress wear conditions. The weight loss is mainly caused by fatigue peeling of the surface layer exposed to abrasive wear under low stress wear condition, but the ploughing and brittle failure are the major reasons under high stress wear condition. The results also show that to substitute V with Ti is a promising method in improving wear resistance of austenitic manganese steels under low stress wear condition.更多还原