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利用Gleeble-1500热模拟试验机进行热拉伸试验,研究了变形温度在950~1150℃范围内,变形速率为0.1 s~(-1)、1 s~(-1)时M35高速钢热塑性行为及断裂机理。结果表明:M35高速钢在试验条件下具有优异的高温塑性,峰值应力随变形温度升高线性下降,随应变速率增加相应升高。热拉伸过程中断裂机制都为韧性断裂,变形温度低于1100℃时断口呈韧窝状,随着温度升高韧窝直径变大、深度增加;变形温度高于1100℃时断口呈沿晶断裂。高温拉伸过程中,碳化物的大小、分布对M35高速钢的热塑性有明显影响。
The hot tensile tests were carried out on a Gleeble-1500 thermal simulator to study the thermal plastic behavior of M35 high speed steel at the deformation temperature of 950 ~ 1150 ℃ and the deformation rate of 0.1 s ~ (-1) and 1 s ~ (-1) And fracture mechanism. The results show that M35 high speed steel has excellent high temperature plasticity under the experimental conditions. The peak stress decreases linearly with the increase of deformation temperature and increases with the increase of strain rate. The fracture mechanism during hot drawing is ductile fracture. When the deformation temperature is lower than 1100 ℃, the fracture is dimpled. With the increase of temperature, the dimple diameter becomes larger and the depth increases. When the deformation temperature is higher than 1100 ℃, the fracture is along the grain fracture. High temperature tensile process, the size of carbide, the distribution of M35 high-speed steel thermoplastic have a significant impact.