Effect of vanadium content on microstructure and properties of Cr20 high chromium cast iron for straw puffing machine screw

doi:10.13251/j.issn.0254-6051.2023.08.002

Abstract

Abstract: To solve the problem of serious wear of the front end of straw puffing machine screw, different contents of vanadium were added into Cr20 high chromium cast iron to study the effect of vanadium content on microstructure and properties, and then the influence of quenching and tempering temperatures on microstructure, hardness, impact property and wear resistance of the tested cast irons was studied by means of optical microscope, scanning electron microscope, hardness tester, impact tester and wear tester. The results show that the addition of vanadium makes the vanadium carbide particles precipitate from the liquid phase preferentially during the cooling process of high chromium cast iron, which plays the role of crystallization nucleation, microstructure refining and hardness improving. After quenching at 990 ℃ for 2 h, air cooling and tempering at 250 ℃ for 2 h, air cooling, the microstructure of the high chromium cast iron with 1.20%V is fine and uniform and the wear loss is less, compared with the high chromium cast iron without V addition, the wear resistance is improved. When the vanadium content is 0.50% under the same heat treatments, the impact property is the best, with an impact absorbed energy of 4.95 J.

Key words: high chromium cast iron, vanadium, quenching+tempering, microstructure, hardness, impact absorbed energy, wear resistance

CLC Number:

TG156

Niu Xu, Liu Yue, Wang Zhuo, Zhang Yajing, Liu Pingxiang. Effect of vanadium content on microstructure and properties of Cr20 high chromium cast iron for straw puffing machine screw[J]. Heat Treatment of Metals, 2023, 48(8): 8-15.

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