关键词: Mn13耐磨钢, 冷轧压下率, 力学性能, 变形孪晶

Abstract: The effect of percent reduction of cold-rolling ( 12. 7% ~38. 3% ) on mechanical properties, structure and relative permeability of 7. 0 ~ 10. 0 mm plate of wear-resistant steel Mn13 (/% : 0. 98C, 0. 45Si, 13. 1Mn, 0. 024P, 0. 002S, 0. 65Cr, 0. 06Mo, 0. 05V) has been studied by using tensile test, metallographic examination, X-ray diffraction analysis (XRD) and transmission electron microscope (TEM). Results show that with increasing percent reduction of coldrolling the steel Mn13 tensile strength, surface hardness and yield strength to tensile strength ratio increase obviously, with increasing the percent reduction of cold-rolling from 0 to 38. 3% , its tensile strength, HB value of surface hardness and raito of yield strength to tensile strength increase respectively form 1 030 MPa, 305 and 0. 50 to 1450 MPa, 460 and 0. 79, and the elongation decreases from 28% to 2. 5%. During work-hardening process martensite transformation has not been occurred, the amount of deformation twins and the dislocation density increase, and the large amount deformation twins and high density dislocation are main cause led to work-hardening of steel Mn13.