The changes of microstructure and hardness with the various heat treatments on the properties of Fe-13.36% Cr-0.37%C stainless steel for precision measuring gauge have been investigated.
Type 420 stainless steel has the self-hardenability, because th...
The changes of microstructure and hardness with the various heat treatments on the properties of Fe-13.36% Cr-0.37%C stainless steel for precision measuring gauge have been investigated.
Type 420 stainless steel has the self-hardenability, because the nose of isothermal transformation diagram located greatly to the right.
The highest hradness in the martensite martrix with undissolved carbide is obtained by oil and air cooling treatment after austenizing at 1000-1050℃, for 1/6-1/3hr.
In case of low temperature tempering, internal stress is reduced without dissolution of martensite matrix, and hardness reduced slightly.
In case of high temperature tempering, hardness is reduced greatly, because the martensite matrix is dissolved into a ferrite and carbide.