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Residual Life Assessment Studies: Predicting the Remaining Life

机译:剩余寿命评估研究:预测剩余寿命

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摘要

Hardness measurements of components hold considerable promise in being able to predict the Residual Life of components. It has been shown that using the hardness results, one can predict the Residual life with sufficient accuracy. There are some requirements before this method can be widely implemented. These areThe hardness should be taken at stressed and unstressed locations at regions where the temperature remains the same using a properly calibrated and accurate hardness tester. It should be possible to repeat the hardness at the same locations during successive RLAs, using the same type of equipment. Sufficient data should be collected for similar components made of similar grades of steel. This can then be analysed as shown earlier. The microstructural route to rest life estimation is more complex than the hardness method. Quantitative analysis of grain boundary creep cavities to determine the residual life is a well established process, but, as has been demonstrated, it can be used only after a set has run for about 30 years. The analysis of the size and interparticle distance of grain boundary carbides and to correlate this with the residual life holds promise but needs more work to derive a correct relationship.
机译:组件的硬度测量在预测组件的剩余寿命方面具有很大的希望。已经表明,使用硬度结果,可以足够准确地预测剩余寿命。在此方法可以广泛实施之前,存在一些要求。这些是应使用正确校准和精确的硬度测试仪在温度保持相同的区域的受应力和无应力位置测得的硬度。使用相同类型的设备,应该有可能在连续的RLA中的相同位置重复硬度。对于由相似等级的钢制成的相似部件,应收集足够的数据。然后可以如前面所示进行分析。估计寿命的微观结构比硬度方法更为复杂。定量分析晶界蠕变腔以确定剩余寿命是一个公认的过程,但是,正如已经证明的那样,它只能在一组运行约30年后才能使用。对晶界碳化物的尺寸和颗粒间距离进行分析并将其与残余寿命相关联是有希望的,但需要做更多的工作才能得出正确的关系。

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