Mitigation of heat treatment distortion of AA 7075 aluminum alloy by deep cryogenic processing using the Navy C-ring test

Author:

Sonar Tushar1,Balasubramanian Visvalingam1,Malarvizhi Sudersanan1

Affiliation:

1. Annamalai Nagar , Tamil Nadu , India

Abstract

Abstract Heat treatment is a promising approach to advance the mechanical properties of AA 7075 aluminum alloy for aerospace structural applications. Quenching is commonly performed after solutionizing of AA 7075 aluminum alloy to impart supersaturated solid solution condition. It involves rapid cooling of the previously solutionized part to room temperature with water as a quenching medium. It leads to severe distortion of the structural part and deteriorates its surface integrity due to the high thermal residual stresses. This paper reports the distortion behavior of heat-treated AA 7075 aluminum alloy by implementing the standard Navy C-ring test. For precise measurements, the coordinate measuring machine (CMM) was used. Deep cryogenic treatment (DCT) was executed after conventional heat treatment (CHT) to reduce the tensile residual stresses and mitigate the distortion potential of AA 7075 aluminum alloy. Results showed significant improvement in surface finish and hardness of deep cryogenically treated AA 7075 aluminum alloy. It is attributed to the precipitation of fine spherical second phase particles distributed uniformly in the matrix. The distortion potential of heat-treated AA 7075 aluminum alloy is minimized by 30.7 % by deep cryogenic processing. It is correlated to the counterbalancing of tensile residual stresses in the heat treated part by compressive residual stresses ensued by deep cryogenic quenching.

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Reference25 articles.

1. G. E. Totten, S. D. Mackenzie: Handbook of aluminium – Physical metallurgy and processes, Marcel Dekker, New York, USA (2003), pp. 305-350

2. M. Reimann, J. Goebel, J. F. dos Santos: Microstructure and mechanical properties of keyhole repair welds in AA 7075-T651 using refill friction stir spot welding, Materials Design 132 (2017), pp. 283-294 DOI:10.1016/j.matdes.2017.07.013

3. H. W. Zoch: From single production step to entire process chain – The global approach of distortion engineering, Materials Science and Engineering Technology 37 (2006), pp. 6-10 DOI:10.1002/mawe.200500958

4. G. Bellows: Introduction to surface integrity, General Electric Aircraft Engine Group, Cincinnati, Ohio, USA (1970), pp. 1-12

5. A. R. Natasha, J. A. Ghani, C. H. C. Haron, J. Syarif: The effect of cryogenic application on surface integrity in manufacturing process: A Review, Journal of Applied Science Research 8 (2012), pp. 4880-4890

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3