孙国栋, 刘长华, 宋勇秉, et al. Effect of Heat Treatment on Structure, Hardness and Aging Kinetics of Plastic Die Steel NAK80[J]. Special Steel, 2018, 39(2): 60-64.
孙国栋, 刘长华, 宋勇秉, et al. Effect of Heat Treatment on Structure, Hardness and Aging Kinetics of Plastic Die Steel NAK80[J]. Special Steel, 2018, 39(2): 60-64.DOI:
The effect of solid solution treatment at 830~910°C and aging at 480~540°C on structure and hardness of Φ20mm plastic die steel NAK80 (/%: 0.15C
0.30Si
1.50Mn
3.00Ni
1.00Cu
1.00Al
0.30Mo
0.30Cr) is tested and its aging kinetics behavior has been studied. Results show that after solid solution at 890℃,the structure of steel NAK80 is lath martensite and granular bainite
the HRC hardness value is up to 42.4
and with aging at 500℃ for 4h
the structure of steel is tempered troostite and precipitated phase
its HRC hardness value is up to 45.5. With calculating by using JMA equation it is obtained that the Avrami indexes n of steel aged at 480°C and 500°C are respectively 2.20 and 1.63
and the apparent activation energy is 96.787J/mol.