爆炸硬化处理对高锰钢冲击磨损性能影响的研究

对Mn13Cr2高锰钢进行了爆炸硬化处理。并分别以玻璃砂、鹅卵石为磨料，在MLD．10动载磨料磨损试验机上对比研究了爆炸前、后Mn13Cr2高锰钢的冲击磨损性能。实验结果表明：在低硬度磨料（玻璃砂）冲击磨损时，爆炸硬化使高锰钢的冲击耐磨性提高20％-40％。在高硬度磨料（鹅卵石）冲击磨损时，在冲击功小于1．7J的条件下，爆炸硬化使高锰钢的冲击耐磨性提高30—50％。在冲击功大予1．7J的条件下，爆炸硬化则使高锰钢的冲击耐磨性降低。爆炸硬化使高锰钢表层硬化和冲击韧性降低是冲击耐磨性发生变化的主要原因。在冲击磨损条件下，爆炸硬化前、后高锰钢磨损面均出现磨料嵌入物及犁沟、凿削坑和剥落坑等形貌特征。爆炸硬化高锰钢适用予低硬度磨料的冲击磨损及高硬度磨料的低冲击功冲击磨损的工况条件。

Investigation on Effects of Explosive Hardening on Impact Abrasive Wear Property of Hadifield Steel

Hadifield steel was treated with explosion hardening. The impact abrasive wear property of exploded hadifield steel and unexploded hadifield steel were studied with glass sand and cobble as abrasive materials in the experimental machine of dynamic load abrasion tester MLD-10. The results show that with soft abrasive materials of glass sand, the impact wear-resistant of hadifield steel with explosion hardening increases 20% -40%. With high hardness abrasive materials of cobble, the impact wear-resistant of hadifield steel with explosion hardening increases 30% -50% when impact energy was less than 1.7 J. When impact energy was beyond 1.7 J, the explosion hardening decreases the impact wear-resistant of hadifield steel. The main reason for the change of impact wear-resistant of hadifield steel is that its superficial coat hardness and dynamic ductility are sharply changed by explosion hardening. The impact wear-resistant of exploded hadifield steel decreases at wide-range with the increasing of impact energy. With impact abrasive condition, abrasive surface appeares pattern feature of insertions, plough ditchs, chisellings and spallings etc. The appropriate work condition of explosion hardening hadified steel is soft abrasive materials with high impact energy and high hardness abrasive materials with low impact energy.