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首页> 美国卫生研究院文献>Materials >Influence of Boron Additions and Heat Treatments on the Fatigue Resistance of CoCrMo Alloys
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Influence of Boron Additions and Heat Treatments on the Fatigue Resistance of CoCrMo Alloys

机译：硼的添加和热处理对CoCrMo合金疲劳强度的影响

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Cobalt-based alloys are widely used in the manufacture of joint prostheses. In this study, the effect of boron additions and heat treatment on the ASTM F75 was evaluated by rotating bending fatigue. The boron ranged from 0.06–1 wt %. The alloys were tested in as-cast and heat-treated conditions. In the as-cast condition, the infinite life was observed at 380 MPa, improving to 433–615 MPa according to the amount of boron added. In the heat treatment condition, the fatigue resistance was improved only in the base alloy. The addition of 0.06 wt % boron and heat treatment led to the same resistance as in the as-cast condition. Adding large amounts of boron combined with heat treatment diminished the fatigue limit. The fracture analysis revealed primarily brittle behaviour with some ductile features even on the same sample; only the heat-treated alloy with 0.06 wt % boron was clearly ductile. This alloy also exhibited notably better toughness to crack propagation.
机译：钴基合金被广泛用于关节假体的制造。在这项研究中，通过旋转弯曲疲劳评估了硼添加和热处理对ASTM F75的影响。硼的含量范围是0.06-1-1 wt％。在铸态和热处理条件下对合金进行了测试。在铸态条件下，在380 MPa下观察到无限寿命，根据硼的添加量提高到433–615 MPa。在热处理条件下，仅在基体合金中提高了抗疲劳性。添加0.06 wt％的硼和进行热处理可产生与铸态相同的电阻。加入大量的硼并结合热处理可降低疲劳极限。断裂分析表明，即使在相同的样品上，其脆性也表现出一些韧性，甚至具有延展性。仅具有0.06重量％的硼的热处理合金明显是延展性的。该合金还表现出明显更好的抗裂纹扩展的韧性。

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