On the Hardness of Martensite and the Relation between Phase Diagram and Hardness (1st Report). On the Hardness of Fe-Ni Alloys due to Heat Treatment

Abstract

To clarify the cause of high hardness of martensite in C-steel, the hardness of Fi-Ni alloys was measured and the following results were obtained. The hardness due to heat treatment was determined by (i) the degree of annealing of hardness of pre-homogenised quenching, (ii) the velocity of lattice transformation and (iii) the degree of annealing effect were destermired by the length of temperature interval after lattice transformation.