烧结硬化材料在现代汽车齿轮、链轮、凸轮中的应用

Application of sinter-hardenable materials for advanced automotive applications such as gears,cams,and sprockets

近年来,汽车产业内部要求应用的材料需要具有高表观硬度、高淬透性以及提高力学性能。这些往往-矛盾的要求迫使寻找开发新材料,这些新材料必须不增大后续热处理的费用,能够提供较高的烧结态表观硬度及良好的静态/动态力学性能。传统的烧结硬化材料虽然提供适用的表观硬度,但力学性能与烧结体密度却不高。本文将用许多文献资料证明,一系列烧结硬化材料既有好的压缩性、高表观硬度,又能增高力学性能。将着重讨论这些材料在汽车(包括发动机与变速器)的,诸如齿轮、凸轮及链轮中的应用。这些零件当前是用压制-烧结-热处理工艺,或者是用常规的铸锻材料-切削加工制造的。还将讨论用高温烧结来强化生产工艺。

Recent demands within the automotive industry have been for appications requiring high apparent hardness,high hardenability,and increased mechanical performance.These often-conflicting requirements necessitated the development of new materials that offer high as-sintered apparent hardness and good static/dynamic mechanical properties without the added expense of a secondary heat treatment.Traditionally,sinter-hardening materials have offered acceptable apparent hardness but at the expense of mechanical properties and sintered density.This paper will document the mechanical properties of a series of sinter hardening materials that offer good compressibility,high apparent hardness and enhanced mechanical properties.The discussion will focus on utilization of these materials in automotive applications（within both the engine and transmission） such as gears,cams and sprockets that are currently produced by either the press,sinter,and heat treat process or by conventional machining of a casting or wrought material.Enhanced processing through high temperature sintering also will be discussed.