Abstract: The impact and rolling composite friction and wear performance of 0.9C-9Mn-2Cr-Mo medium manganese steel and Hardox400 ( 0.22C-1.6Mn-1.4Cr-Mo) and Hardox500 (0.27C-1.0Mn-0.94Cr-Mo) wear resistant steels have been studied by M2000 multifunction friction and wear testing machine, and the structure transformation and wearing mechanism of steels are analyzed by X-ray difiractometer, SEM and TEM. Test results show that the hot-rolled medium steel has better impact-rolling composite wearing resistance than that of Hardox martensite wear resistance steels ；there is a hardened layer with 1 000μm thickness at impact-wear surface of medium manganese steel, its max microhardness value is up to HV490 and the Rockwell HRC hardness value is up to 53. The main wear mechanism is drill wear failure with local fatigue scale off, and the work hardening and improving wear resistance of medium manganese steel is mainly by dislocation strengthening, deformation twining and martensite phase transformation.

摘要： 通过M2000多功能摩擦磨损试验机研究0. 9C-9Mn-2Cr-Mo中锰钢和Hardax400(0. 22C-1.6Mn-1.4Cr-Mo)以及Hardex500(0.27C-1.0Mn-0.94Cr-Mo)耐磨钢的冲击和滚动复合摩擦磨损性能,并利用XRD、SEM和TEM等分析了组织转变及磨损机理。实验结果表明,热轧中锰钢比Hardox马氏体耐磨钢表现出更好的抗冲滚磨料磨损性能。中锰钢冲滚磨损表面存在厚度达1000μm的硬化层,最高显微硬度达HV490,洛氏硬度达HRC53。中锰钢磨损机制以凿削破坏为主,伴随局部的疲劳剥落破坏;位错强化、形变孪晶和马氏体相变是中锰钢硬化和抗磨损性能改善的主要原因。

关键词: 0.9C-9Mn-2Cr-Mo, 热轧中锰钢, 冲滚磨损, 磨料磨损, 磨损机理