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An Alternate Approach to Accelerated Spheroidization in Steel by Cyclic Annealing

机译:循环退火的一种加速钢球化的替代方法

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In this work an annealed 0.6 wt.% carbon steel was subjected to cyclic heat treatment process that consisted of repeated short-duration (6 min) holding at 810℃ (above Ac_3 temperature) followed by cooling in a flowing air medium (flow rate: 6 m~3/h). After 8 cycles (about 1 h and 20 min), the microstructure mostly contains spheroidized cementite and ferrite along with trace amount (3%) of pearlite. In addition to the diffusion within lamella, the disintegration of lamellae through dissolution of cementite at preferred sites of lamellar faults during short-duration holding above Ac_3 temperature, and the generation of defects (lamellar faults) during non-equilibrium cooling in a flowing air medium are the main reasons of accelerated spheroidization.
机译:在这项工作中,对经过退火处理的0.6 wt。%碳钢进行循环热处理过程,该过程包括在810℃(高于Ac_3温度)下反复进行短时间(6分钟),然后在流动的空气介质中冷却(流速: 6 m〜3 / h)。经过8个循环(约1小时20分钟),显微组织主要包含球化渗碳体和铁素体以及痕量(3%)的珠光体。除了薄层内部的扩散外,在高于Ac_3的温度下短时保持时,通过渗碳体在层状断层的优选位置处的渗碳体的溶解,以及在流动性空气介质中非平衡冷却过程中产生的缺陷(层状断层),片状层破裂是加速球化的主要原因。

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