ISSN：1003-8620

CN：42-1243/TF

Governed by: CITIC Pacific Special Steel Group Co., LTD

Sponsored by: Daye Special Steel Co., LTD.

Special Steel ›› 2018, Vol. 39 ›› Issue (2): 60-64.

Special Issue: 模具钢

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Effect of Heat Treatment on Structure, Hardness and Aging Kinetics of Plastic Die Steel NAK80

Sun Guodong1,2，Liu Changhua1,2，Song Yongbin1，Yang Xianqi1   

  1. 1 School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005；
    2 Surface Green Remanufacturing Engineering Technology Center of Jiangxi Province, Jiujiang University, Jiujiang 332005
  • Received:2017-10-10 Online:2018-04-01 Published:2022-07-04

热处理对塑料模具钢NAK80组织、硬度和时效动力学的影响

孙国栋1,2，刘长华1,2，宋勇秉1，杨先啓1   

  1. 1九江学院机械与材料工程学院，九江332005；
    2江西省表面绿色再制造工程技术中心,九江学院，九江332005
  • 作者简介:孙国栋(1981-),男，硕士(2007年合肥工业大学)，副教授, 2004年安徼工业大学(本科)毕业，模具材料和模具CAE研究。

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Abstract: 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.

摘要： 试验了830~910℃固溶处理和480~540℃时效对Φ20mm 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96.787J/mol。

关键词: NAK80塑料模具钢, 板条马氏体, 粒状贝氏体, 热处理, 时效动力学

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