High strength high chromium cast iron and valve rocker arm made

Details High strength high chromium cast iron and valve rocker arm made High strength high chromium cast iron and valve rocker arm made

1989-11-28

1992-03-17

Yee, Deborah

Metal treatment

Stock

Ferrous

148324, 148325, C22C 3704, C22C 3706

Patent

active

050965158

ABSTRACT:
A high strength high chromium cast iron contains fine particle precipitated hard carbide. The precipitated hard carbide has an average particle size of 20 .mu.m or less and hardness of Hv 500 or more in martensite base matrix, and has area ratio in a range of 30% or more and 45% or less. The precipitated hard carbide has spheroidal ratio (surface area of sphere circumscribing the precipitated hard carbide versus actual surface area of precipitated hard carbide) of 40% or more.

REFERENCES:
patent: 3410682 (1968-11-01), Avery et al.
patent: 3690958 (1972-09-01), Thompson
patent: 4411713 (1983-10-01), Betts
patent: 4547221 (1985-10-01), Norman et al.
M. Kano and I. Tanimoto, "Wear Mechanism of High Wear-Resistant Materials for Automotive Valve Trains, Wear of Materials", ASME 1991, pp. 83-89.

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