Fatigue Properties of High Strength Cr-alloyed PM Steels Produced by High Temperature Sintering and Sinter-hardening
Steel powder grades pre-alloyed with Cr are suitable for the manufacturing of high performance PM components,since Cr is a cost-efficient alloying element with excellent hardenability.Cr-alloyed PM steel parts are also fully recyclable,and this is increasingly important from a sustainability perspective.High fatigue strength is a key feature for many applications with high demands,such as synchronizer parts in automotive transmissions.This paper presents fatigue properties for two Cr-alloyed powder grades after different sinter-hardening processes.Sintering trials were undertaken in a mesh belt furnace at 1120 ℃,as well as a roller hearth high temperature furnace at 1250 ℃.In both trials,rapid cooling was applied after sintering to obtain predominately martensitic microstructures.The fatigue strength of the sinter-hardened and tempered materials were evaluated by plane bending tests on standard test bars.Microstructures were identified and correlated with the fatigue performance of the Cr-alloyed materials.
PM steel chromium sinter-hardening high temperature sintering fatigue strength
Bergman Ola Andersson Michael Chasoglou Dimitris
H(o)gan(a)s AB,SE-263 83 H(o)gan(a)s,Sweden
国际会议
北京
英文
1931-1936
2018-09-16(万方平台首次上网日期,不代表论文的发表时间)