摘要
采用雾化干燥法和两步烧结法制备了一种晶粒度约20μm的95 W细晶钨合金棒材,利用分离式Hopkinson压杆(SHPB)对细晶钨合金进行高应变率的动态力学性能研究,并与传统钨合金进行对比,分析了应变及应变率对动态性能的影响。结果表明,尽管细晶95W的强度极限σb和延伸率δ较传统95 W都低,而在高应变率下,细晶95 W的最大应力σmax要高于传统钨合金,最大应变εmax只有较少的下降。高应变率下细晶95 W出现应变硬化和热软化两种竞争效应,在较低应变时,应变硬化占主导,最后热软化后出现应力急剧下降。
The fine-grain 95W alloy with tungsten grain size of 201am was prepared by spray drying method and two-step sintering method. Dynamic mechanics properties were studied, and were compared with traditional tungsten alloy by Hopkinson experimental device. The results show that, even though the ab and δ of the fine-grain 95W are lower than those of the traditional 95W, its σmax is higher and its εmax is slightly lower at the high strain rate. There is a competition between strain hardening and thermal softening at the high strain rate. The strain hardening dominates the process at the beginning, and the stress declines sharply after thermal softening.
出处
《辽宁化工》
CAS
2015年第7期776-778,781,共4页
Liaoning Chemical Industry
关键词
细晶钨合金
动态力学性能
雾化干燥法
两步烧结法
free-grain tungsten heavy alloy
dynamic mechanics properties
spray drying
two-step sintering
