本文用彩色金相法研究了球墨外围奥氏体壳的生长过程及奥氏体对石墨畸变的影响。结果表明,球墨外围的奥氏体壳不是连续的奥氏体层,而是由若干个楔形晶体组成。由于球墨外围奥氏体成核的有利条件不同;故在不同位置先后成核并生长。之后,互相接触形成一个壳。 经电子探针分析,沟槽中正偏析元素及低熔点金属含量高,因而沟槽液体的熔点低、凝固慢。根据沟槽的凝固速度,奥氏体壳可分成快封闭、慢封闭及不封闭三种类型,与石墨球的畸变有密切关系。
To study the growth of austenitic shells around the spheroidal graph-ite, color metallography has been employed. It is found that the shell is not acontinuous layer of austenite, but a cluster of wedgeshaped crystals. Three typesof shells has been observed. That may strongly affect the deterioration of the sphe-roidal graphite. The mechanism of the formation of the austenitic shells has alsobeen discussed.
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