Study on the Effect of Micro-alloying on the Properties of 40Cr25Ni20Si2 Heat-resistant Steel
The effect of Al,Ti,N,Nb and other composite microalloying on the microstructure and properties of ZG40Cr25Ni20Si2 heat-resistant steel was studied.The results showed that the composite micro-alloyed ZG40Cr25Ni20Si2 steel with different combinations reached a complete oxidation resistance level;the composite micro-alloying of about 0.3%Nb with Ti,Al improves the high-temperature oxidation resistance level and high-temperature deformation resistance of heat-resistant steel.Increasing the Nb content to over 0.7%,a large amount of Nb carbides precipitate in the structure,and the deformation resistance continues to increase,but the high-temperature oxidation stability decreases;Al and Ti composite micro-alloying has the best stability in high-temperature oxidation resistance.The Cr2O3-Al2O3 composite oxide layer is uniform,continuous,dense,and tightly bonded to the steel base,but the high-temperature deformation resistance is lower than that of samples containing Nb.When the N content increases,the overall performance of heat-resistant steel remains stable by appropriately reducing the Ni content with micro-allying.
micro-alloyinghigh temperature deformation resistancehigh temperature oxidationoxidation layer
NETL
NSTL
万方数据
维普
