高碳钢钢丝在铅浴和CMC水溶液中的冷却行为

利用钢丝探头分别测量了含碳0.70%的钢丝在铅浴和CMC水溶液中的冷却过程。用冷却曲线分析法阐释了钢丝的冷却过程和相变规律。钢丝的“体积效应”和在其冷却介质中的热扩散能力共同决定了铅浴淬火过程及钢丝的相变过程。高碳钢钢丝在0.25%CMC水溶液中可完全转变为珠光体组织,但其转变温度由于其连续冷却转变特性而高于在铅浴中的转变温度。根据铅浴淬火的冷却本质和CMC水溶液的冷却特性,用于替代铅浴的淬火介质应设法加快初始阶段冷却速率。

Cooling Behaviors of High Carbon Steel Wires in Patenting and CMC Solutions

The cooling process of 0.70% carbon steel wires upon patenting in patenting and CMC(carboxyl methyl cellulose) aqueous solutions was measured respectively with the steel wire probes.The cooling process and the transformation behaviors of the wires,upon patenting were interpreted by cooling curve analyses.It is the coherence of the 'mass effect' of steel wires and the thermal diffusion ability in cooling media that dominates the patenting process and the transformation behaviors of the wires.The high carbon steel wires could fulfill the transformation to pearlite in the 0.25% CMC aqueous solution.But the transformation temperature is higher than that in lead patenting due to its attribution of continuous cooling transformation.According to the cooling essence for patenting and the cooling characteristics of the CMC aqueous solutions,the adoption of the alternative should be focused on accelerating the cooling of the primary stage for patenting.