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本文对W6Mo5Cr4V2A1冷轧高速钢板和W6Mo5Cr4V2冷拔高速钢丝进行不同工艺的热处理后,用电子显微镜观察,发现冷变形量较大时,高速钢存在沿冷作加工方向的变形织构和局部高畸变带,而且这种变形织构和畸变带经淬火回火后仍然遗传下来,对高频热塑性和刀具开裂影响甚大,尤其对铝高速钢影响更为显著,而这种变形织构和畸变带除了与变形量大有关外,其高畸变带还与硫的偏聚有关。较大减面率的冷变形和低温退火的应变时效作用所共同造成的基体中碳和合金元素的贫化和不均匀分布,降低局部区域的οs是高频热塑性下降的另一个重要原因。经冷作加工后及时进行相变球化退火或高温退火,对改善变形织构和高畸变带使合金元素均匀化是有利的,其机理在于相变重结晶破坏变形织构的遗传和使基体合金元素均匀化。
In this paper, W6Mo5Cr4V2A1 cold-rolled high-speed steel and W6Mo5Cr4V2 cold-drawn high-speed steel wire after heat treatment of different processes, electron microscopy and found that the cold deformation is large, high-speed steel there along the cold working direction of the deformation texture and local high distortion , And this deformation texture and distortion after quenching and tempering still inherited, the high-frequency thermoplastic and tool cracking have a great impact, especially for high-speed steel, aluminum is more pronounced, and this deformation texture and distortion with the exception of Large deformation related, the high distortion zone also with the partial polymerization of sulfur. Reduced and non-uniform distribution of carbon and alloying elements in the matrix caused by the cold deformation of the larger reduction rate and the strain aging effect of the low-temperature annealing reduce the local area οs is another important reason for the decline of high-frequency thermoplasticity. It is beneficial to homogenize the alloying elements by improving the deformation texture and the high distortion band by performing phase change spheroidizing annealing or high temperature annealing in time after the cold working. The mechanism lies in that the phase transformation recrystallization destroys the inheritance of the deformed texture and makes the matrix Uniform alloy elements.