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本文通过扫描俄歇微探针(AES)、EMX型电子微探针(EPMA)、X射线衍射仪和透射电镜综合分析了20CrMnTi钢渗碳过程中的氧化行为,研究了渗碳表面的氧化机制,氧化对表面碳量、表层合金元素分布及淬火组织的影响。结果表明,渗碳内氧化除按晶界优先氧化型机制形成外,平行生长型机制也起作用。电镜观察证实,表面氧化造成了淬火组织沿层深分布的不均匀性变化。最表层是极细珠光体,该层下面是针状珠光体+上贝氏体,再下面是上贝氏体+马氏体组织。研究指出,提高淬火冷却速度是控制并减小内氧化淬火非马氏体层深的有效措施。
In this paper, the oxidation behavior of 20CrMnTi steel during carburizing was analyzed by scanning Auger microprobe (AES), EMX electron microprobe (EPMA), X-ray diffractometer and transmission electron microscope. The oxidation mechanism of carburized surface , The effect of oxidation on the surface carbon content, the surface alloying elements and the quenched structure. The results show that, in addition to carburizing internal oxidation by the grain boundary preferential oxidation mechanism formation, the parallel growth mechanism also works. Electron microscopy confirmed that surface oxidation resulted in the inhomogeneous distribution of quenched microstructure along the layer. The most superficial layer is very fine pearlite. Below this layer is acicular pearlite + upper bainite, followed by upper bainite + martensite. The research indicates that increasing the quenching cooling rate is an effective measure to control and reduce the depth of non-martensite in internal oxidation and quenching.