锻压技术

30CrNi3MoVA钢的晶粒细化及组织均匀化研究

英文标题：Research on grain refinement and organization uniformity of 30CrNi3MoVA steel

作者：叶玉娟高全德

分类号：TG335.55

出版年,卷(期):页码：2019,44(5):169-173

摘要：

30CrNi3MoVA钢极易产生粗晶和混晶组织，且具有较强的组织遗传性，严重影响产品的综合力学性能。针对该问题，对30CrNi3MoVA钢的特性进行了分析，制定了30CrNi3MoVA锻件的生产工艺，通过预留锻比在780 ℃控温锻造、锻后预备热处理进行二次过冷，30CrNi3MoVA钢的组织均匀细化且充分转变，同时调质前增加一道正火工序，进一步均匀、细化组织。根据制定的工艺进行试验，结果表明，锻后正火+扩氢退火，进行二次过冷，30CrNi3MoVA钢的组织充分转变，且性能良好；调质热处理前增加一道正火工序，并加强淬火力度，30CrNi3MoVA钢的组织得到进一步均匀细化。该工艺解决了30CrNi3MoVA钢组织粗大及不均匀的生产难题，提高了其强韧性。

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.

基金项目：

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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