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为了进一步了解工业掺杂钨丝的拉伸性能和断裂方式,研究了加工和工艺退火后的晶粒尺寸对拉拔钨丝和300—1300℃退火钨丝的影响。试验发现,加工和退火的晶粒尺寸对掺杂钨丝的拉伸性能有如下影响: 1.用常规方法生产的、晶粒尺寸分别为50和105μm的两组试样,其强度和延伸率实际上是一样的。2.通过强力拉伸工艺制得的φ0.24mm的钨丝(由φ1.0mm的钨丝拉制而成),其强度和延伸率有明显改善。3.拉伸断裂方式分为三种,劈裂、纤维开裂和劈裂—纤维开裂混合型断裂,且随着实际断裂应变值及退火温度的变化而不同。最后讨论了拉伸性能和断裂方式与真应变量(加工硬化)以及与〈110〉纤维织构的清晰度和强度之间的关系。
In order to further understand the tensile properties and fracture modes of industrial doping tungsten wires, the effects of grain size after working and annealing process on the drawn tungsten and annealed tungsten at 300-1300 ℃ were studied. It has been found that the grain sizes of working and annealing have the following effects on the tensile properties of doped tungsten wires: 1. Two sets of samples produced by a conventional method and having a grain size of 50 and 105 μm, respectively, have strength and elongation It’s actually the same. 2. By strong drawing process obtained φ0.24mm of tungsten wire (made from φ1.0mm of tungsten drawn), the strength and elongation significantly improved. 3. Tensile fracture methods are divided into three kinds, splitting, fiber cracking and splitting - fiber splitting mixed fracture, and with the actual fracture strain values and annealing temperature changes. Finally, the relationship between tensile properties and mode of fracture with true strain (work-hardening) and clarity and strength with <110> fiber texture is discussed.