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首页> 外文期刊>Journal of Materials Engineering and Performance >Grain Refinement Mechanism and Microstructural Evolution of M50NiL Steel during Multi-directional Impact Forging
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Grain Refinement Mechanism and Microstructural Evolution of M50NiL Steel during Multi-directional Impact Forging

机译：多方向冲击锻造期间M50nil钢的晶粒细化机理和微观结构演化

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摘要

This study investigated the effect of varying temperatures and cumulative strains on M50NiL steel during multi-directional impact forging (MDIF). The grain size was found to increase gradually with increasing temperature, after being held at 1050, 1100, 1150 and 1180 degrees C for 30min, with the minimum grain size observed at 1100 degrees C during the MDIF process. The M50NiL steel subjected to MDIF at 1100 degrees C and at varying cumulative strains of 0.6, 1.8, 3.6 and 7.2 exhibited grain sizes that decreased with increasing cumulative strain. The mean grain size gradually decreased to similar to 1 mu m at a cumulative strain of 7.2. New small grains were nucleated at grain boundaries via dynamic recrystallization, and microbands were formed via the temperature drop during the continuous forging process. The grains were subdivided into subgrains by the microbands, and these subgrains were converted to new refined grains via transformation of their boundaries into high-angle boundaries. Further, martensite transformation was restrained owing to the grain refinement. Improved tensile strengths values are obtained after MDIF process.
机译：本研究研究了多向冲击锻造期间M50nil钢的不同温度和累积菌株的影响（MDIF）。在3050,1100,1150和1180℃下保持30min后，在30分钟内保持后，发现晶粒尺寸随着温度的增加而逐渐增加，在MDIF工艺期间在1100℃下观察到最小晶粒尺寸。将M50nil钢在1100℃下进行MDIF，在0.6,1.8,3.6和7.2的不同累积菌株下表现出随着累积菌株的增加而降低的晶粒尺寸。平均晶粒尺寸在7.2的累积菌株中逐渐降低至1μm。通过动态重结晶在晶界下进行新的小晶粒，通过在连续锻造过程中通过温度下降形成微多裂。晶粒被麦克麻细胞细分为亚甲，通过将它们的边界转化为高角度边界，将这些子化转化为新的精制晶粒。此外，由于晶粒细化，马氏体转化受到抑制。在MDIF工艺后获得改进的拉伸强度值。

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