LOW-CYCLE FATIGUE OF THE SECOND GENERATION DIRECTIONALLY SOLIDIFIED SUPERALLOY

ZHANG ShiChao; LI Li; HOU XueQin

doi:10.16579/j.issn.1001.9669.2017.02.012

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LOW-CYCLE FATIGUE OF THE SECOND GENERATION DIRECTIONALLY SOLIDIFIED SUPERALLOY

更新时间：2022-09-22

- LOW-CYCLE FATIGUE OF THE SECOND GENERATION DIRECTIONALLY SOLIDIFIED SUPERALLOY
- Journal of Mechanical Strength Vol. 39, Issue 2, Pages: 311-315(2017)
- 作者机构：
  
  1. 北京航空材料研究院材料检测与评价航空科技重点实验室航空材料检测与评价北京市重点实验室
  2. 北京慕迪光大技术服务有限公司
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2017.02.012
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ZHANG ShiChao, LI Li, HOU XueQin. LOW-CYCLE FATIGUE OF THE SECOND GENERATION DIRECTIONALLY SOLIDIFIED SUPERALLOY. [J]. 39(2):311-315(2017)
DOI：

ZHANG ShiChao, LI Li, HOU XueQin. LOW-CYCLE FATIGUE OF THE SECOND GENERATION DIRECTIONALLY SOLIDIFIED SUPERALLOY. [J]. 39(2):311-315(2017) DOI： 10.16579/j.issn.1001.9669.2017.02.012.

摘要

研究了DZ406合金950℃与1000℃时应变比为0.05下的低周疲劳性能,结果表明,应变比R≠-1时,非对称循环应变控制会产生平均应力松弛现象,且随着应变幅的增大,平均应力松弛速率增大;采用修正的SWT模型能很好的预测不同温度下应变比为0.05的低周疲劳寿命,预测精度在基本落在3倍的分散带内,通过对断口的观察,发现随着应变幅的增大,裂纹源增多。

Abstract

The total strain-controlled low cycle fatigue（ LCF） behaviors of a directionally solidified（ DS） superalloy DZ406 at 950℃ and 1000℃ for R = 0. 05 were investigated. The results of LCF tests indicated that mean stress relaxation occurred under asymmetric straining. The rate of mean stress relaxation increased with the increasing of strain amplitude. All the LCF data obtain under various ratios were well correlated by a modified SWT approach for lifetime prediction,the all data fell into the factor of 3 scatter band. With the increasing of strain amplitude it appeared muti-fatigue crack initiations.

关键词

定向凝固高温合金低周疲劳应变比平均应力松弛

Keywords

DS superalloyLow cycle fatigueStrain ratioMean stress relaxation

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