本文针对某厂生产的纯镍N6线材及成品铆钉表面出现的裂纹,对其进行分析.通过使用S-520型扫描电镜观察裂纹中出现的夹杂物,从其形貌及能谱的分析确定其中包含Al、Si、Ca等成分;然后使用EPMA1600型电子探针进行进一步验测,发现试样中的夹杂物含有大量的O、C、S等元素,充分说明试样中的夹杂物是以复合氧化物的形式存在.为了更准确的判断夹杂物的类型,将试样放在金相显微镜下,通过不同的视场发现其中的夹杂物包含有硅酸盐类.为了避免在制样时对成品本身夹杂物的影响,用电解分离法将试样进行电解,把电解所得的非金属夹杂物进行分离,然后进行能谱分析,发现结果与以上检测结果一致.综合以上各种检测手段,结果表明:纯镍N6线材内部和表面存在的大量非金属夹杂物是形成裂纹的主要原因.
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