ON THE AUSTEMPER OF Si-Mn SPRING STEEL

概要

論文の詳細を見る
Author investigated austempering of Si-Mn spring steel and considered whether austempering can be practically applied for heat-treatment of springs instead of quenching and tempering by comparing mechanical properties of the steel heat-treated with both processes.The results obtained are summarized as follows;(1) Yield point and elastic limit are lower by austempering than by quenching and tempering at the same tensile strength.(2) Hardness is lower by austempering than by quenching and tempering at the same tensile strength of more than 125kg/mm2, i.e., tensile strength is higher by austempering than quenching and tempering at the same hardness when steel was austempered at temperature of 350-400°C.(3) Elongation is inversely proportional to tensile strength when quenched and tempered. When austempered, its value shows peak at temperature of 350-375°C, but the relation between elongation and tensile strength is not clear.(4) Shock value is higher by quenching and tempering than austempering so long as tensile strength is lower than 125kg/mm2, but this relation is reversed at the tensile strength of more than 125kg/mm2.
日本ばね学会の論文