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首页> 外文会议>2001 TMS Annual Meeting on Structural Biomaterials for the 21st Century, Feb 11-12, 2001, New Orleans, LA >EFFECT OF HEAT TREATMENT ON THE STRENGTH AND DUCTILITY OF A PRECIPITATION HARDENABLE NICKEL-CHROMIUM BASE DENTURE ALLOY
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EFFECT OF HEAT TREATMENT ON THE STRENGTH AND DUCTILITY OF A PRECIPITATION HARDENABLE NICKEL-CHROMIUM BASE DENTURE ALLOY

机译：热处理对可沉淀硬化的镍铬基义齿合金强度和延展性的影响

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摘要

The effect of annealing an as-cast nickel-chromium base denture alloy (Ticonium Premium 100) on its microstructure, tensile properties, hardness and fracture behavior was studied by light microscopy and scanning electron microscopy. The as-cast alloy exhibited an inhomogeneous dendritic structure consisting of fcc γ phase dendrites with an inhomogeneous distribution of γ' precipitates and an interdendritic eutectic mixture of fcc γ phase and NiBe. This structure had a yield strength of 760 MPa, a tensile strength of 825 MPa, a percent elongation of 3.4% and hardness of 348 HV. Annealing at 600℃ for various times up to 10 hours resulted in little change in microstructure and mechanical properties. Annealing at 750℃ resulted in precipitate formation in the center of the dendrites, a small increase in strength and hardness and no change in ductility. Annealing at 900℃ resulted in a coarsening of the as-cast precipitate structure, a decrease in the strength and hardness and an increase in the ductility. Annealing at 1,050℃ resulted in the dissolution of the as-cast precipitate structure, a large decrease in strength and hardness and a large increase in ductility. The fracture surfaces of the as-cast alloy and alloy annealed at 600℃ and 750℃ exhibited brittle features such as cleavage through intermetallic particles. Alloy annealed at 900℃ and 1,050℃ exhibited ductile dimple rupture. Annealing the as-cast alloy for 1 hour at 1,050℃, quenching and then aging at 750℃ for 1 hour, resulted in a fine distribution of precipitates in (he dendrites, higher strength and hardness that the as-cast alloy, but much improved ductility.
机译：通过光学显微镜和扫描电子显微镜研究了铸态镍铬基义齿合金（Ticonium Premium 100）的退火对其显微组织，拉伸性能，硬度和断裂行为的影响。铸态合金表现出不均匀的树枝状结构，该结构由具有不均匀分布的γ'沉淀物的fccγ相树枝状晶体和fccγ相与NiBe的树枝状共晶混合物组成。该结构的屈服强度为760 MPa，抗拉强度为825 MPa，百分伸长率为3.4％，硬度为348 HV。在600℃下进行长达10小时的不同时间的退火处理后，组织和机械性能几乎没有变化。在750℃退火导致在枝晶中心形成沉淀，强度和硬度略有增加，而延展性不变。 900℃退火导致铸态析出物组织粗大化，强度和硬度降低，延展性提高。在1050℃下退火导致铸态沉淀结构的溶解，强度和硬度大大降低，延展性大大提高。铸态合金和在600℃和750℃退火的合金的断裂表面表现出脆性特征，例如通过金属间颗粒的裂解。在900℃和1050℃退火的合金表现出延性的酒窝破裂。将铸态合金在1,050℃退火1小时，淬火，然后在750℃时效1小时，导致析出物中的分布均匀（树枝状，比铸态合金具有更高的强度和硬度，但有很大改善）延展性。

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