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以ZG310-570为基体、高碳铬铁为主渗剂,采用传统铸渗工艺并结合Al热反应制备了钢基表面铸渗复合材料,研究了Al含量对铸渗层组织、厚度、耐磨性的影响。结果表明,在浇注温度为1650℃,预制块(厚度为10mm)以半嵌入式置于型腔内壁中下部的条件下,当渗剂中Al粉的质量分数不大于2%时,渗层和基体间表现为良好的冶金结合,铸渗层中含有大量的M7C3、Cr7C3等硬质相碳化物,且加Al的渗层中有Al2O3硬质相的存在。随着Al含量增加,渗层厚度和耐磨性得到提高;Al含量为2%的渗层综合质量最佳,铸渗层厚度可达到15mm,其耐磨性是基体耐磨性的6.65倍。
Taking ZG310-570 as matrix and high-carbon ferrochrome as main infiltration agent, the infiltration and infiltration process of Al-based steel was investigated by using traditional infiltration and infiltration process. The effects of Al content on microstructure, thickness, Sexual effects. The results show that when the pouring temperature is 1650 ℃ and preformed block (thickness 10mm) is placed in the middle and lower part of the inner wall of the cavity in semi-embedded condition, when the mass fraction of Al powder in the penetration agent is not more than 2% The matrix showed good metallurgical bonding, the casting infiltration layer contained a large amount of hard phase carbides such as M7C3 and Cr7C3, and the presence of Al2O3 hard phase in the infiltrated layer of Al. With the increase of Al content, the thickness and wear resistance of the coating are improved. The optimum quality of the coating with Al content of 2% is 15mm. The wear resistance is 6.65 times of the wear resistance of the substrate.