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灰铸铁中含锰量大于硅后,即能获得100％细片状珠光体,A型加D、E型石墨和一定数量的马氏体加碳化物硬化相,得到减磨铸铁所要求的金相组织。用MS-3型往复式磨损试验机,研究灰铸铁自磨时的耐磨性,在同一磨损规范下与HT20-40灰铸铁、高磷铸铁、硼铸铁及钒钛铸铁的相对耐磨性作了比较。在生产条件下,用锰灰铸铁和HT25-47灰铸铁浇注了要求耐磨的机床铸件。锰灰铸铁的相对耐磨性比HT25-47灰铸铁平均提高2.5倍。实物磨损试验的结果基本上与试样磨损结果相吻合,初步确定了锰灰铸铁作为减磨铸铁材质所应有的地位,对磨损机理也进行了初步探讨。
Gray cast iron containing more manganese than silicon, which can get 100% fine pearlite, A plus D, E-type graphite and a certain amount of martensite carbide hardened phase, get the required reduction of iron Phase organization. The MS-3 type reciprocating wear tester was used to study the wear resistance of gray cast iron during self-grinding. The abrasion resistance of HT20-40 gray cast iron, high phosphorus cast iron, boron cast iron and vanadium titanium cast iron under the same wear criterion A Under production conditions castings requiring wear-resistant machine castings were cast with manganese gray cast iron and HT25-47 gray cast iron. Manganese gray cast iron relative wear resistance than HT25-47 gray cast iron an average of 2.5 times. The results of the physical wear test are basically consistent with the results of the sample wear, initially determined the proper position of manganese gray cast iron as the material of reducing the cast iron, and also discussed the wear mechanism.