Influence of Heat Treatment on Ratcheting Fatigue Behavior and Post Ratcheting Tensile Properties of Commercial Aluminum

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• 作者：R. Kreethi (1)
  Preeti Verma (2)
  Krishna Dutta (1)
  
  1. Department of Metallurgical and Materials Engineering ; National Institute of Technology ; Rourkela ; 769 008 ; India
  2. Department of Metallurgical Engineering ; Indian Institute of Technology-Banaras Hindu University ; Varanasi ; Uttar Pradesh ; India
  
• 关键词：Heat treatment ; Ratcheting ; Stress amplitude ; Mean stress ; Tensile property
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：68
• 期：2
• 页码：229-237
• 全文大小：955 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Materials Science, general
  Tribology, Corrosion and Coatings
  
• 出版者：Springer India
• ISSN：0975-1645

文摘

The objective of this work is the study of ratcheting fatigue behavior and post fatigue tensile properties of the commercial aluminum via heat treatment like annealing and normalizing. In view of this, stress controlled fatigue tests carried out at room temperature up to 150 cycles under different combinations of mean stress and stress amplitude using a servo-hydraulic testing machine. It is found that in both annealed and normalized conditions, accumulation of ratcheting strain increases with increasing stress parameters. Strain accumulation in normalized condition is less due to increased dislocation density during asymmetric cyclic loading. In normalized, the saturation in strain accumulation was also achieved earlier as compared to annealed due to attainment of stable dislocation configuration. It has been noticed that the Post fatigue tensile strength enhances while the ductility decreases with increasing stress parameters because of cyclic hardening. Fractographic studies have demonstrated that dimple size decreases with increasing strain accumulation.