高密度烧结-硬化材料的性能与应用

Properties and applications of high density sinter-hardening materials

烧结-硬化材料的特点是淬透性高,这使着在加速冷却时可形成的马氏体的量(体积分数)>80%。但是,这些中等合金化的材料往往压缩性较低,从而导致密度较低,限制了其在高强度零件中的应用。为了使这些材料用于新的高强度零件用途,需要用何种方法来增高当今烧结-硬化材料的生坯与烧结件的密度呢?本文阐述了如何用新合金化系统和先进的粘结剂技术相结合,来增高标准的烧结-硬化合金的生坯与烧结件密度。将说明导致的力学性能改进,以及高密度烧结-硬化材料可能在像高强度齿轮之类用途中找到应用。

Sinter-hardening materials are characterized by their high hardenability which enables the formation of 〉 80% martensite during accelerated cooling. However, these moderately alloyed materials often exhibit lower compressibility and the resulting lower density limits their use in potential high strength applications. What is needed is a method to improve the green and sintered density of current sinter-hardening materials that will enable these materials to be utilized in new high strength applications. This paper describes how the green and sintered density of standard sinter-hardening alloys can be improved using new alloy systems coupled with advanced binder technology. The resulting improvements in mechanical properties will be presented as well as the potential use of bighdensity sinter-hardening materials in demanding applications such as high strength gears.