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本文阐述了透射电子显微镜对MnS—AIN抑制的3％Si钢中沉淀的研究。热轧带不同的热处理制度的影响与冷轧和脱碳退火再结晶后的沉淀物的形态有关。热轧带的热处理制度包括1120℃固溶,空冷到选择的温度并且淬火。在温度高于650℃淬火时,得到一种由变形衬度而成像的均匀分布的细小组织,(大约100A)。可以认为,空位园环由于碳的扩散而稳定。在温度低于650℃淬火时空位园环不能产生。采用高的淬火温度而得到的冷轧和再结晶织织含有得细小的沉淀质点的聚集群,这种聚集群大部份是由球形的MnS和一些角状的AIN所组成。粒子聚集的倾向随淬火温度的降低而减弱,同时,在各聚集体内和各聚集体之间,MnS粒子发生不均粗化,从540℃或低于540℃淬火,导致混乱的粒子分布,而且较大机率出现角状AIN。冷轧和再结晶组织中聚集体的消失,它与最初热处理时,随着淬火温度降低,空位园环的消失大伴是一致的。
This article describes the transmission electron microscopy of MnS-AIN inhibited the precipitation of 3% Si steel. The effects of different heat treatment regimes on the hot strip are related to the morphology of the precipitates after cold rolling and decarburization annealing recrystallization. Heat treatment systems for hot strip include solid solution at 1120 ° C, air cooling to a selected temperature, and quenching. When quenched at temperatures above 650 ° C, an evenly distributed fine structure imaged by the deformation contrast was obtained (about 100 A). It is believed that the vacancy loop is stable due to the diffusion of carbon. When the temperature is below 650 ℃ quenching space ring can not produce. Cold-rolled and recrystallized fabrics obtained with a high quenching temperature contain clusters of fine precipitated particles, mostly composed of spherical MnS and some angular AIN. The propensity of the particles to aggregate decreases as the quenching temperature decreases, meanwhile, the MnS particles are unevenly roughened within each aggregate and between the aggregates, quenched from 540 ° C or below, resulting in disorganized particle distribution, and Larger probability of emergence of angular AIN. The disappearance of aggregates in the cold-rolled and recrystallized microstructure is consistent with the disappearance of the vacancy rings as the quenching temperature decreases with the initial heat treatment.