确定了在落管中形成玻璃的临界冷却速率。
The critical cooling rate for the glass formation in the tube was determined.
总体上自北而南，剥蚀速率和冷却速率均逐渐变小。
The cooling rate and denudation rate decreased overall from north to south.
随着冷却速率的增加，铁素体体积分数减少，晶粒尺寸变细。
The transformed ferrite volume fraction increases and grain size decreases with the increase of cooling rate.
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