Study on Morphology and Size Distribution of Sulfide Inclusions in Free Cutting Steel AISI 1215
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摘要: 对易切削钢AISI 1215铸坯中的夹杂物形貌、尺寸进行观察和统计,结果显示铸坯边缘区域为I类MnS,中心区域为II类MnS。根据Uhlmann的凝固前沿夹杂物析出模型以及铸坯化学成分分析,认为冷却速度和硫元素偏析对MnS夹杂形貌和尺寸分布有着重要影响,冷却速度越快,越易形成I类MnS,硫元素偏析越严重越有利于形成II类MnS。Abstract: The morphology and size distribution of MnS inclusions in AISI 1215 free cutting steel billet were studied.The results show that the sulfides evolve from type I to type II with the position moving from edge to center at the cross section.Based on Uhlmann model and chemical compositions of the billet,it is suggested that cooling rate and sulfur segregation play an important role in controlling the morphology and diameter of MnS inclusions.The increasing cooling rate facilitates the formation of type I MnS,but is unfavorable to the growth of MnS.Sulfur segregation contributes to the formation of type II MnS.
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Key words:
- free cutting steel /
- sulfide /
- morphology /
- sulfur segregation /
- cooling rate
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