Effect of Microstructure on Mechanical Properties of 12Cr1MoV Heat-Resistant Steel

Abstract

The 12Cr1MoV experimental steel with different microstructures were prepared by controlled rolling-relaxation-online low temperature tempering technology. Effect of microstructures on mechanical properties of experimental steels were studied by metallographic method, tensile test and impact test. The content of lamellar pearlite, the content and distribution of granular carbide are the main factors affecting the mechanical properties of the experimental steels. The strength of the experimental steel increases with the increase of lamellar pearlite content, and the elongation increases with the decrease of ferrite grain size and the increase of granular carbide content. But the impact toughness of the experimental steel decreases with the increase of granular carbide content at the ferrite grain boundary.