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.