Effect of heat treatment and forging process on transverse and longitudinal impact properties of 1Cr12Ni3Mo2VN blade steel
In order to solve the problem of large differences in transverse and longitudinal properties of 1Cr12Ni3Mo2VN blade steel,the effects of different heat treatment and forging processes on the microstructure,precipitated phase and mechanical properties of 1Cr12Ni3Mo2VN steel were studied by means of metallography,SEM,XRD,TEM,tensile and impact experiments.The results show that the impact toughness of the blade steel is the best when the quenching temperature is from 1 040℃to 1 060℃,and the transverse and longitudinal impact ratio reaches 0.9 when quenching from 1 040℃,which meets the performance requirements.At the same time,the secondary tempering treatment is carried out,and it is concluded that appropriately increasing the secondary tem-pering temperature is also conducive to improving the impact toughness.This is mainly because the increase of sec-ondary tempering temperature causes the decomposition of martensite,the increase of fine carbide precipitated phase,and the impact performance is improved under the condition of ensuring hardness.The influence of upset-ting and drawing process on transverse and longitudinal mechanical properties of the blade steel is not obvious,but the ratio of transverse and longitudinal impact work will be reduced with the increase of pier pulling times.There-fore,the use of one pier and one pull blank in production can meet the performance requirements,providing a bet-ter solution for on-site production.
quenchingtemperingtransverse and longitudinal performanceimpact toughnessprecipitated phaseM23C6
NETL
NSTL
万方数据
