大规格钼合金径向锻造中心裂纹成因分析及改进措施  

Cause Analysis and Improvement Measures of Center Cracks of Large-size Molybdenum Alloys during Radial Forging

作　　者：卢瑶 杨栋林 LU Yao;YANG Dong-lin(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《稀有金属与硬质合金》2021年第1期35-39,共5页Rare Metals and Cemented Carbides

基　　金：国家重点研发计划项目(2017YFB0306001)。

摘　　要：通过金相组织观察、化学成分分析、断口形貌观察、显微硬度测试、有限元模拟等方法对大规格径向锻造钼合金棒材的周期性中心裂纹进行分析。结果表明,棒材中心存在轻微的成分偏析,严重的不均匀变形是棒材在锻造过程中产生中心裂纹的主要原因。通过提高原料纯净度、均匀化退火以及增加回火温度和时间,可在一定程度上防止大规格钼合金棒材在加工过程中产生严重的中心裂纹。The periodic central cracks of large-size radially forged molybdenum alloy bars were analyzed by metallographic microstructure observation, chemical composition analysis, fracture morphology observation, microhardness test, finite element simulation and other methods.The results show that there is slight component segregation in the center of the bar, and severe uneven deformation is the main reason for the center cracks in the bar during forging.By improving the purity of raw materials, homogenizing annealing, and increasing the tempering temperature and time, serious center cracks in large-size molybdenum alloy bars during processing can be prevented to a certain extent.

关 键 词：钼合金棒材 径向锻造 中心裂纹 不均匀变形 成分偏析 

分 类 号：TG146.412[一般工业技术—材料科学与工程]