Experiment on thermomechanical fatigue in nickel based single crystal superalloy DD6

荆甫雷; 蒋康河; 张斌; 胡殿印; 王荣桥

doi:10.13224/j.cnki.jasp.2018.12.017

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Experiment on thermomechanical fatigue in nickel based single crystal superalloy DD6

更新时间：2026-07-07

- Experiment on thermomechanical fatigue in nickel based single crystal superalloy DD6
- Vol. 33, Issue 12, (2018)
- 作者机构：
  
  1. 中国航空发动机集团有限公司中国航空发动机研究院,北京,101304
  2. 中国航空发动机集团有限公司湖南动力机械研究所,湖南,株洲,412000
  3. 北京航空航天大学能源与动力工程学院,北京,100191
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.2018.12.017
  CLC：
- Published：2018
- 稿件说明：
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荆甫雷, 蒋康河, 张斌, 胡殿印, 王荣桥. 镍基单晶高温合金DD6热机械疲劳试验[J]. 航空动力学报, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.017

荆甫雷, 蒋康河, 张斌, et al. Experiment on thermomechanical fatigue in nickel based single crystal superalloy DD6[J]. 2018, 33(12).
荆甫雷, 蒋康河, 张斌, 胡殿印, 王荣桥. 镍基单晶高温合金DD6热机械疲劳试验[J]. 航空动力学报, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.017 DOI：

荆甫雷, 蒋康河, 张斌, et al. Experiment on thermomechanical fatigue in nickel based single crystal superalloy DD6[J]. 2018, 33(12). DOI： 10.13224/j.cnki.jasp.2018.12.017.

摘要

针对单晶气冷涡轮叶片的服役载荷特征

以镍基单晶高温合金DD6为对象

设计开展了薄壁圆管试样热机械疲劳(TMF)试验。结果表明：DD6变形响应呈现出明显的TMF棘轮效应

且与相位角、机械载荷水平等密切相关；在相同载荷条件下

同相(IP)TMF寿命总是明显短于反相(OP)。引入高温保载时间或增大机械载荷均会引起棘轮应变的明显增加

缩短结构寿命。结合断口和纵向切片分析

识别了不同载荷条件下影响单晶寿命的关键损伤因素

其中IP TMF主导损伤机理为蠕变和疲劳

而OP TMF主导损伤机理为氧化和疲劳。

Abstract

According to the service loads experienced by air cooled single crystal turbine blades

thermomechanical fatigue (TMF) experiments were designed and conducted on thin-walled tube specimens made of nickel based single crystal superalloy DD6. The results indicated that the deformation response of DD6 exhibited remarkable ratcheting effect

which was closely related to the phase angle and mechanical loading; and the lifetime of in phase (IP) TMF under all experiment conditions were shorter than that of out of phase (OP) TMF. Either introducing dwell time at peak temperature or increasing mechanical load led to more ratcheting strains and fewer failure cycles. Based on the metallographic examination on fracture surface and longitudinal section of specimens

the critical life-limiting factors under different load conditions were identified. Creepage and fatigue dominate in the competing damage mechanisms for IP TMF

while oxidation and fatigue dominate for OP TMF.

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