Effect of quenching temperature(990-1070 ℃)on microstructure and hardness of 4Cr4Mo3W2V1 die steel was studied by means of OM,SEM and Rockwell hardness tester.The results show that the microstructure of the quenched 4Cr4Mo3W2V1 steel is mainly martensite,bainite and undissolved carbide.With the increase of quenching temperature,the grain size of the steel increases continuously,the number of carbides in the microstructure decreases continuously,and the hardness increases first and then decreases.Quenched at 1050 ℃,the carbide in the microstructure is basically dissolved into the matrix,the volume fraction of carbide is 0.41％,the grain size does not grow significantly,and the hardness reaches the maximum of 61.4 HRC.1050 ℃ is the ideal quenching temperature for the 4Cr4Mo3W2V1 steel.
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