摘要
通过液相烧结制备不同Mn含量的90%W-7%Ni-3%Fe合金,研究Mn对合金的烧结温度、保温时间和力学性能的影响。采用SEM观察试样断口形貌;利用金相显微镜观察样品显微组织并检测W晶粒尺寸;并对烧结试样的相对密度、抗拉强度和硬度等性能进行测定与分析。结果表明,当w(Mn)=0.25%时,1425℃保温1h,合金相对密度达到98.3%;1400℃保温45min,合金抗拉强度达到928MPa,硬度HRC达到37.2。W晶粒由20～25μm减少到12～15μm。Mn在相界面上生成的中间相,阻止了W原子在粘接相中的扩散,阻止了W晶粒长大,提高合金的力学性能。
90%W-7%Ni-3%Fe alloy with different amount of Mn was prepared by liquid phase sintering. The effects of Mn on sintering temperature, holding time and mechanical properties for specimens were studied. Fracture morphology was investigated by SEM. W crystal sizes were measured by metallographic microscope. The relative density, the tensile strength and hardness were also measured and analyzed. The results show that relative density of the samples sintered at 1 425℃ for 1 h was 98.3% when the Mn content was 0.25%, the tensile strength was 928 MPa and the hardness HRC was 37.2 when the samples were sintered at 1 400℃ for 45 min. Average W crystal size decreased from 20-25 p.m to 12-15μm. When Mn was added, middle phase was appeared at interface, which decreased diffuse of W atom in binder phase and prevented W crystal from growing up, which improved the mechanical properties.
出处
《硬质合金》
CAS
北大核心
2009年第1期10-14,共5页
Cemented Carbides
作者简介
李文超．（1983-）男．硕士．主要从事钨合金和硬质合金方面的工作。电子邮箱：li0631@163．com
