Transactions of Materials and Heat Treatment

Title：Research on surface aluminizing process and properties of hot working die steel

Authors： Zhao Hongyu

Unit： Changchun Vocational Institute of Technology

KeyWords： die steel aluminizing process microstructure properties

ClassificationCode：TG146

year,vol(issue):pagenumber：2014,39(11):102-106

Abstract：

The surface aluminizing process of 4Cr5MoSiV1 hot working die steel was studied, and the microstructures of aluminizing layer with different NH4Cl content, aluminizing temperature and aluminizing time were observed. The phases and hardness of the aluminizing layer with optimized surface aluminizing process were analyzed by XRD and micro-hardness. The results show that the thickness of aluminizing layer increases gradually with the rising of aluminizing temperature, and the thickness increases obviously when the aluminizing temperature rises from 850 ℃ to 950 ℃. The thickness of aluminizing layer increases gradually with prolonging temperature holding time, during which the thickness increases most obviously when the aluminizing holding time is within 3-5 h. The optimal surface aluminizing process for hot working die steel is 1% NH4Cl catalyst, the aluminizing temperature of 950 ℃ with holding time of 5 h. For the aluminizing layer obtained with optimized aluminizing process, the Fe3Al and FeAl phases are formed in its surface layer and FeAl phase is formed in its inner layer.

Funds：

长春市科技计划项目（KJJH20120064）

赵宏宇（1969-），女，学士，副教授

Reference：

［1］周小平, 胡心彬, 江锋. 新型热作模具钢的热疲劳性能[J]. 金属热处理, 2011, 36(1): 107-109. Zhou X P, Hu X B, Jiang F. The thermal fatigue properties of new hot work die steel [J]. Heat Treatment of Metals, 2011, 36 (1): 107-109.
［2］谢辅洲, 杨世伟. 高温合金渗铝涂层抗高温氧化性能的研究[J]. 热加工工艺, 2004, 34(3):11-13. Xie F Z, Yang S W. Study on high temperature oxidation properties of aluminized coating on superalloy [J]. Hot Working Technology, 2004, 34 (3): 11-13.
［3］Yang C F, Zhang Y Q. Applications of V-N micro-alloying technology in HSLA steels [J]. Iron and Steel, 2002, (11):42-47.
［4］Glowacki M. The mathematical modeling of thermo-mechanic processing of steel during multi-pass shape rolling[J]. Material Processing Technology, 2005,168: 336-343.
［5］Murtaza G. Empirical corrosion fatigue life prediction models of a high strength steel [J]. Engineering Fracture Mechanics, 2000, 67: 461-474.
［6］孙健, 王晓鸣, 邹宗树. 8407模具钢表面渗铝的研究[J]. 材料与冶金学报, 2009,8(2): 145-150. Sun J, Wang X M, Zou Z S. Surface infiltration of 8407 die steel [J]. Journal of Materials and Metallurgy of Aluminum, 2009,8(2): 145-150.
［7］邓代玉. 模具钢表面渗铝工艺及性能研究[D]. 重庆: 重庆理工大学, 2011.Deng D Y. Aluminizing Process and Properties of Die Steel [D]. Chongqing: Chongqing University of Technology, 2011.
［8］刘世永, 孟德, 高学敏. 低碳钢渗铝加粒子渗氮的表面硬化处理[J]. 金属热处理, 2004, 29(4): 41-44. Liu S Y, Meng D, Gao X M. Aluminium particle nitriding surface hardening of low carbon steel [J]. Heat Treatment of Metals, 2004,29 (4): 41-44.

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