Transactions of Materials and Heat Treatment

Title：Research on grain refinement and organization uniformity of 30CrNi3MoVA steel

Authors： Ye Yujuan Gao Quande

Unit： Zhong Yuan Special Steel Co. Ltd. Jiyuan 459008 China

KeyWords： 30CrNi3MoVA steel grain refinement organization uniformity temperaturecontrolled forging undercooling twice

ClassificationCode：TG335.55

year,vol(issue):pagenumber：2019,44(5):169-173

Abstract：

30CrNi3MoVA steel easily produces coarse and mixed crystal structure, and has strong inheritance of organization, so the comprehensive mechanical properties of products is seriously reduced. To solve the problem, the characteristics of 30CrNi3MoVA steel were analyzed, and the production technology of 30CrNi3MoVA was developed. By reserving fixed forging ratio then forged at 780 ℃, and undercooling twice during the heat treatment after forging, the microstructure of 30CrNi3MoVA steel was uniformed and fined, and fully changed. At the same time, a normalization procedure was added, which uniformed the microstructure and refined the grain once again. According to the formulated process to test, the results show that the microstructure of 30CrNi3MoVA steel fully transforms and property is good by the normal heat after forging + hydrogen expansion annealing and secondary overcooling. By adding a normalization procedure before quenching and tempering heat treatment and strengthening quenching intensity, the microstructure of 30CrNi3MoVA steel is uniformed and fined, which solves the problem of coarse and uneven structure, then improves strength and toughness of 30CrNi3MoVA steel.

Funds：

作者简介：叶玉娟（1983-），女，硕士，高级工程师 Email：yyj20032006@163.com

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