Effect of aluminising on the low cycle fatigue life of a directionally solidified nickel-base alloy used for manufacturing turbine blade

Q4 Engineering

International Journal of Materials and Structural Integrity Pub Date : 2018-08-09 DOI:10.1504/IJMSI.2018.10014935

B. Sahoo, S. K. Panigrahi, Shri R.K. Satpathy

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Abstract

In the recent years, directionally solidified (DS) turbine blades are found widely in advanced aero-engines owing to their excellent creep resistance properties. Aluminising coating on turbine blades protects against high temperature oxidation and corrosion. Turbine blades of a military gas turbine engine are subjected to low cycle fatigue (LCF) damage during START and STOP cycles. The present investigation deals with the low cycle fatigue (LCF) life of a directionally solidified nickel-base super alloy MAR M 002. Influence of aluminising on LCF life of the DS alloy MAR M002 has been evaluated by carrying out strain controlled LCF test at 900°C with strain amplitudes (Δet/2) of ±0.3%, ±0.5%, and ±0.8% at a strain ratio (R) of –1. At low strain, coating favours LCF life. Accumulated plastic strain and tensile stress developed during cyclic loading and stiffness ratio are being used to correlate fatigue life. Fractography revealed initiation of cracks in the coating and multiple secondary cracks.

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渗铝对涡轮叶片用定向凝固镍基合金低周疲劳寿命的影响

近年来，定向凝固涡轮叶片以其优异的抗蠕变性能在先进航空发动机中得到了广泛的应用。涡轮叶片上的铝涂层可防止高温氧化和腐蚀。军用燃气涡轮发动机的涡轮叶片在启动和停止循环期间受到低周疲劳（LCF）损伤。本文研究了定向凝固镍基超级合金MARM002的低周疲劳寿命。通过在900°C下进行应变控制LCF试验，评估了渗铝对DS合金MAR M002 LCF寿命的影响，应变幅度（Δet/2）分别为±0.3%、±0.5%和±0.8%，应变比（R）为-1。在低应变下，涂层有利于LCF寿命。循环加载过程中产生的累积塑性应变和拉伸应力以及刚度比被用来关联疲劳寿命。断口分析显示涂层中出现裂纹和多个二次裂纹。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Materials and Structural Integrity Engineering-Mechanical Engineering

CiteScore

0.40

自引率

0.00%

发文量