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通过定量金相分析显微疏松含量的方法,研究了制样参数对某铸造低压涡轮叶片中显微疏松含量测量结果的影响规律。抛光压力一定,一定时间内显微疏松的测量值随抛光时间增长而增大,并逐步达到一个稳定值。抛光压力越大,显微疏松测量值达到稳定值的时间越短。预磨样品过程中,叶片基体相压入疏松孔洞,使抛光时间较短时显微疏松测量值低于实际值,压入疏松孔洞的叶片基体相在抛光过程中逐渐去除。在显微疏松评定时,应确保抛光时间足够长,以保障评定结果的准确性。
The influence of sample preparation parameters on the measurement results of microscopic looseness in a cast low pressure turbine blade was studied by quantitative metallographic analysis of the microscopic loose content. Polishing pressure must be measured within a certain period of time slightly increased with the polishing time increases and gradually reach a stable value. The greater the polishing pressure, the shorter the time for which the microscopic looseness measurement reaches a steady value. In the process of pre-grinding the sample, the substrate of the blade was pressed into the loose hole so that the measurement value of the micro-looseness was lower than the actual value when the polishing time was short, and the matrix of the blade pressed into the loose hole was gradually removed in the polishing process. In the loose microscopic evaluation, should ensure that the polishing time is long enough to ensure the accuracy of the assessment results.