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首页> 外文会议>Materials Science Technology Conference and Exhibition >DIFFERENT ROUTES FOR THE DEVELOPMENT OF FERRITE-PEARLITE MICROSTRUCTURES SUITABLE FOR SPHEROIDIZATION DURING SOFT ANNEALING TREATMENTS
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DIFFERENT ROUTES FOR THE DEVELOPMENT OF FERRITE-PEARLITE MICROSTRUCTURES SUITABLE FOR SPHEROIDIZATION DURING SOFT ANNEALING TREATMENTS

机译：用于开发铁素体 - 珠光体微观结构的不同途径，适用于软退火处理期间球化

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摘要

Cementite spheroidization during conventional soft annealing treatment, usually applied to medium carbon steels prior to cold forming, has been studied. Initial ferrite-pearlite microstructural features and conditioning of such microstructures by deformation assisted techniques allow a wide range of spheroidized microstructures and mechanical properties after annealing. The application of low deformations (ε=0.3) at warm temperatures on undercooled austenite or pearlite results in a higher cementite spheroidization and ferrite grain size refinement, improving consequently cold formability. This can be achieved without a considerable increase in hardness which is interesting for extending cold forming tool life. The improvement of spheroidization kinetics is related to the activation of cementite lamellae breakup mechanisms and the enhancement of the solute diffusion through both grain (sub)boundaries and ferrite matrix. The austenite warm deformation induces ferrite and pearlite dynamic transformation. And if the deformation is applied on pearlite, the refinement is achieved by continuous recrystallization as the cementite spheroidization proceeds.
机译：已经研究了常规软退火处理期间的渗碳铝石型球化，通常在冷成形之前应用于中碳钢。通过变形辅助技术初始铁氧体 - 珠光体微结构和调节这种微结构的微观结构允许在退火后的各种球化微结构和机械性能。低变形（ε= 0.3）在冷冻奥氏体或珠光体上的温度温度下施加在较高的渗碳型球形和铁氧体晶粒尺寸细化中，从而改善了冷的成形性。这可以实现而没有相当大的硬度增加，这对延伸冷成型工具寿命很有意思。球化动力学的改善与渗碳液层破碎机制的激活和通过晶粒（亚）边界和铁氧体基质的溶质扩散的增强。奥氏体温度变形诱导铁氧体和珠光体动态变换。并且如果在珠光体上施加变形，则通过连续再结晶来实现细化，因为渗碳石球化进行。

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