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铁基粉末冶金产业在继续开发与扩大使用非传统粉末冶金合金化元素。Mo、Ni与Cu的价格、环境与可回收性一直在推动这种扩大使用。Mn是铸锻钢的价格比较低廉且有效的合金化元素;不过,过去氧的敏感性限制了Mn在粉末冶金钢中的应用,现在氧分压低的氮-氢烧结气氛可允许使用Mn。Mn与适量Mo的组合可使粉末冶金钢合金的力学性能接近FD-0405的水平。同样重要的是,这些合金可在常用的工业烧结条件下进行处理。在较高碳含量下,这些锰钢可用作贫合金烧结硬化钢牌号。笔者将讨论含Mn铁基粉末冶金材料的这些优势。
Iron-based powder metallurgy industry continues to develop and expand the use of non-traditional powder metallurgy alloying elements. The price, environment and recyclability of Mo, Ni and Cu have been driving this expansion. Mn is a relatively inexpensive and effective alloying element for forged steels; however, past oxygen sensitivity limited the use of Mn in powder metallurgical steels and now the nitrogen-hydrogen sintering atmosphere with low oxygen partial pressure allows the use of Mn. The combination of Mn with the appropriate amount of Mo can make the mechanical properties of powder metallurgy steel alloys close to the level of FD-0405. Equally important, these alloys can be processed under common industrial sintering conditions. At higher carbon content, these manganese steels can be used as poor alloyed hardened grades. I will discuss these advantages of Mn-based iron-based powder metallurgy materials.