Φ1200 mm连铸坯原始缺陷剖析与锻件生产实践中的质量探索  

Original Defect Analysis of Φ1200 mm Continuous Casting Billet and Quality Exploration in Forging Production Practice

作　　者：李新宇 赵凯兵 李敏 LI Xinyu;ZHAO Kaibing;LI Min

机构地区：[1]中国一重集团有限公司,黑龙江齐齐哈尔161000

出　　处：《大型铸锻件》2024年第6期118-122,124,共6页Heavy Casting and Forging

摘　　要：重点探究了42CrMo4钢连铸圆坯的原始缺陷以及其代替模铸锭生产实心轴类锻件的可行性。通过对原始铸坯开展低倍、化学、金相、气体、夹杂物、密度等检测后发现:铸坯内部孔洞与偏析主要集中在中心区域并向一侧延伸,化学成分及气体较均匀,组织为珠光体+铁素体,非金属夹杂物种类及规格存在一定差异,铸坯中心区域密度低于表层。对铸坯进行锻造、调质后,超声检测结果显示:试验件在达到一定的锻造比后,其质量均能达到一般轴类锻件的超声检测标准,相应地增大锻造比,能够进一步改善锻件的心部质量。本次试验表明:大直径连铸圆坯能够代替模铸锭生产实心轴类锻件。This paper focuses on the original defects of 42CrMo4 steel continuously cast round billet and its feasibility of replacing the die casting ingots to produce solid shaft forgings.After conducting low-magnification,chemical,metallurgical,gas,inclusion,and density tests on the original cast billet,it was found that the internal cavity and segregation were mainly concentrated in the central region and extended to one side;the chemical composition and gas were relatively uniform;the microstructure was pearlite+ferrite;the types and specifications of non-metallic inclusions existed certain differences;and the density in the center region was lower than that of the surface.After forging and quenching and tempering the cast billet,the results of nondestructive testing showed that after achieving a certain forging ratio,the quality of the test pieces could meet the nondestructive testing standards for general shaft forgings.By further increasing the forging ratio,the core quality of the forgings could be further improved.The results of this experiment show that continuously cast round billet with large diameter can replace the die casting ingot to produce solid shaft forging.

关 键 词：42CrMo4 连铸圆坯 试验件 

分 类 号：TG11[金属学及工艺—物理冶金]