AMS6308钢大棒材锻造开裂原因分析
Hot Working Technology(2017)
Abstract
通过观察裂纹与断口形貌,结合第二相析出规律,分析了AMS 6308 钢大规格棒材锻造开裂原因.结果表明:大锭型中Cu 偏析导致钢热塑性变差是锻件开裂的主要原因.在钢锭加热时Cu 元素偏析会析出大量低熔点富Cu相.高温下部分呈液膜状,随着富Cu 液膜的浸润,造成晶界结合力下降.随后,钢的热塑性变差,在锻造应力的作用下产生裂纹并扩展.
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