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首页> 外文期刊>Acta biomaterialia >Effects of chromium and nitrogen content on the microstructures and mechanical properties of as-cast Co-Cr-Mo alloys for dental applications
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Effects of chromium and nitrogen content on the microstructures and mechanical properties of as-cast Co-Cr-Mo alloys for dental applications

机译：铬和氮含量对牙科用铸造Co-Cr-Mo合金显微组织和力学性能的影响

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摘要

The microstructure and mechanical properties of as-cast Co-(20-33)Cr-5Mo-N alloys were investigated to develop ductile Co-Cr-Mo alloys without Ni addition for dental applications that satisfy the requirements of the type 5 criteria in ISO 22674. The effects of the Cr and N contents on the microstructure and mechanical properties are discussed. The microstructures were evaluated using scanning electron microscopy with energy-dispersive X-ray spectroscopy (EDS), X-ray diffractometry (XRD), and electron back-scattered diffraction pattern analysis. The mechanical properties were evaluated using tensile testing. The proof strength and elongation of N-containing 33Cr satisfied the type 5 criteria in ISO 22674. -phase with striations was formed in the N-free (20-29)Cr alloys, while there was slight formation of -phase in the N-containing (20-29)Cr alloys, which disappeared in N-containing 33Cr. The lattice parameter of the γ-phase increased with increasing Cr content (i.e. N content) in the N-containing alloys, although the lattice parameter remained almost the same in the N-free alloys because of the small atomic radius difference between Co and Cr. Compositional analyses by EDS and XRD revealed that in the N-containing alloys Cr and Mo were concentrated in the cell boundary, which became enriched in N, stabilizing the γ-phase. The mechanical properties of the N-free alloys were independent of the Cr content and showed low strength and limited elongation. Strain-induced martensite was formed in all the N-free alloys after tensile testing. On the other hand, the proof strength, ultimate tensile strength, and elongation of the N-containing alloys increased with increasing Cr content (i.e. N content). Since formation of -phase after tensile testing was confirmed in the N-containing alloys the deformation mechanism may change from strain-induced martensite transformation to another form, such as twinning or dislocation slip, as the N content increases. Thus the N-containing 33Cr alloy with large elongation is promising for use in dentures with adjustable clasps through one piece casting.
机译：研究了铸造的Co-（20-33）Cr-5Mo-N合金的显微组织和力学性能，以开发出不需添加Ni即可满足ISO 5类标准要求的牙科应用的延性Co-Cr-Mo合金22674.讨论了铬和氮含量对显微组织和力学性能的影响。使用扫描电子显微镜和能量色散X射线光谱仪（EDS），X射线衍射仪（XRD）以及电子反向散射衍射图谱分析对微结构进行了评估。使用拉伸测试评估机械性能。含N的33Cr的屈服强度和伸长率满足ISO 22674中的5类标准。在无N的（20-29）Cr合金中形成带条纹的相，而在N-中几乎没有形成相含（20-29）Cr合金，消失在含N的33Cr中。含N合金中的γ相晶格参数随Cr含量（即N含量）的增加而增加，尽管由于Co和Cr之间的原子半径差较小，无N合金中的晶格参数几乎保持不变。通过EDS和XRD的成分分析表明，在含N的合金中，Cr和Mo集中在晶胞边界，从而富集了N，稳定了γ相。无氮合金的机械性能与Cr含量无关，并显示出低强度和有限的延伸率。拉伸试验后，在所有无氮合金中都形成了应变诱发的马氏体。另一方面，含N合金的屈服强度，极限抗拉强度和伸长率随Cr含量（即N含量）的增加而增加。由于在含氮合金中确定了拉伸试验后形成的相，所以随着氮含量的增加，变形机理可能从应变诱导的马氏体转变为另一种形式，例如孪晶或位错滑移。因此，具有较大伸长率的含N 33Cr合金有望通过一件铸件用于可调节扣环的假牙中。

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