Mechanical Properties of PM Steels Dispersed with High Speed Steel Powder Particles

Abstract

PM steels containing Fe-Mo, Fe-Cr-Mo-Co powder hard particles have been used for engine valve seat inserts. Possibility on replacement of the Fe-Mo, Fe-Cr-Mo-Co powder particles with high speed steel powder particles of M3/2 and M42, were examined in order to improve properties of the above PM steels.
The results obtained were summarised as follows.
1)Addition of M3/2 and M42 powder particles is effective for strength up to 5wt%, however over 5wt% addition is harmful for strength.
2)PM steel contained M3/2 and M42 powder particles each 2wt% together showed best properties for wear.