摘要
试验了830~910℃固溶处理和480~540℃时效对Φ20 mm NAK80塑料模具钢(/%:0.15C,0.30Si,1.50Mn,3.00Ni,1.00Cu,1.00Al,0.30Mo,0.30Cr)组织和硬度的影响,并对其时效动力学行为进行了研究。结果表明,890℃固溶处理后,NAK80钢组织由板条马氏体和粒状贝氏体组成,HRC硬度值达到42.4,经过500℃保温4 h的时效处理后,该钢的组织为回火屈氏体和析出相,其HRC硬度值可达45.5。利用JMA方程得到480℃和500℃时效时的Avrami指数n分别为2.20和1.63,表观激活能为96.787 J/mol。
The effect of solid solution treatment at 830 - 910 ℃ and aging at 480 - 540 ℃ on structure and hardness of Ф20 mm 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 4 h, the structure of steel is tempered troostite and precipitated phase, its HRC hardness value is up to 45.5. With calculat- ing by using JMA equation it is obtained that the Avrami indexes n of steel aged at 480 ℃ and 500 ℃ are respectively 2. 20 and 1.63, and the apparent activation energy is 96. 787 J/mol.
出处
《特殊钢》
北大核心
2018年第2期60-64,共5页
Special Steel
