Effect of Retrogression and Re-Aging on Fatigue Crack Growth Behavior of Al 7075 Alloy
Sunil Kumar k1, P L Srinivasa Murthy2

1Sunil Kumar K, Research scholar Dept of Mechanical Engineering, VTU/ R.L. Jalapa Institute of Technology, Doddaballapur (KA), India.
2Dr P L Srinivasa Murthy, Dept of Mechanical Engineering, VTU /M.S. Ramaiah Institute of Technology, Bengaluru, India.

Manuscript received on 03 July 2019 | Revised Manuscript received on 04 July 2019 | Manuscript published on 30 August 2019 | PP: 243-247 | Volume-8 Issue-10, August 2019 | Retrieval Number: I8010078919/2019©BEIESP | DOI: 10.35940/ijitee.I8010.0881019
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: In this activity I used very familiarly known as two steps heat treatment called RRA is applied on AL 7075 alloy to examine the fatigue behavior. this process includes the various stages of heat treatments includes, annealing, high temperature pre-precipitation, artificial aging (T6), retrogression and re-aging. The specimens are initially heated to 473o & then quenched in water medium .the specimens are further heated to 18hr, 22hr, 26hr respectively .after this specimens are heated 230o, 250o, 270o, 290o with different time intervals 7 & 14 min respectively to enhance the strength of the material this process we call it as retrogression and re-aging .after this conducted experiment and came to know that by using RRA method we can increase the strength of the material to maximum extent. 
Keywords:  AA 7075alloy, heat treatments, fatigue behavior.
Scope of the Article: Heat Transfer