12%Cr合金凝固过程夹杂物析出的实验研究与热力学分析（英文）

发布时间：2018-03-05 22:10

本文选题：夹杂物析出　切入点：凝固　出处：《稀有金属材料与工程》2017年05期 　论文类型：期刊论文

【摘要】：铁基12%Cr合金(质量分数)常被用来制造先进电机转子。电机转子要求材料具备良好的机械性能和细小的夹杂物,大尺寸的夹杂物通常会使得其性能恶化。本研究在缓冷试验后采用淬火工艺,保留了12%Cr合金液态冷却和凝固过程中形成的夹杂物,并通过扫描电子显微镜和能谱分析对夹杂物的形貌及化学成分进行了分析。结果表明:除各种氧化物夹杂外,在试样中观察到典型的氮化钛夹杂,但冶炼过程中并未添加钛元素。夹杂物析出的热力学计算结果表明:氮化钛夹杂析出于凝固末期,来自原料中痕量的钛元素即可导致氮化钛的析出,而氧化铝夹杂在液态合金中即可生成。通过控制钛元素和氧元素的含量在合理范围,有利于抑制凝固过程的夹杂析出。同时对凝固过程三氧化二钛夹杂析出的可能性进行了研究。
[Abstract]:Fe-based 12Cr alloy (mass fraction) is often used to manufacture advanced motor rotor, which requires good mechanical properties and fine inclusions. The properties of large size inclusions usually deteriorate. In this study, the inclusion formed during liquid cooling and solidification of 12Cr alloy was retained by quenching after slow cooling test. The morphology and chemical composition of the inclusions were analyzed by SEM and EDS. The results showed that the typical titanium nitride inclusions were observed in the samples except for various oxides. However, no titanium element was added in the smelting process. The thermodynamic calculation results showed that the titanium nitride inclusions precipitated at the end of solidification, and the trace titanium elements from the raw materials could lead to the precipitation of titanium nitride. And alumina inclusions can be formed in liquid alloys. By controlling the content of titanium and oxygen in a reasonable range, The possibility of titanium trioxide inclusion precipitation during solidification was studied.
【作者单位】：上海交通大学;
【基金】：National Key Basic Research Development Program of China(“973”Program)(2011CB012900)
【分类号】：TG141

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