Abstract
In aerospace applications, the quench delay (QD) after solution treatment for the alloy AA2219 is to be restricted to 15 s. However, extended QDs are also permitted if the job temperature is maintained above 480 °C. To understand the effect of QD on low-temperature mechanical properties, AA2219 forgings were water-quenched after solution treatment with QDs of 15, 30, 50, 100, 200 and 300 s and their low-temperature tensile properties were evaluated. Metallurgical characterisation using both optical and electron microscopes was performed. The tensile test results indicate that the strength starts decreasing after 200 s (corresponds to the temperature 505 °C), and the % reduction in the area of cross section is drastically reduced from 25 to 12%. This is a vital input in deciding on the acceptability of forgings having longer QD as AA2219 being a choice of material for cryogenic applications.
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Acknowledgements
The authors are thankful to Dy. Director, SRQA, LPSC, for his constant and consistent encouragement during the course of this study. The authors are also grateful to Director, LPSC, for having given permission to publish this work. The authors wish to express their sincere thanks to M/S. Rachamallu forgings (P) Ltd for their whole-hearted support in forging and heat treatment operations. Thanks are also due to Material testing facility of QC-Materials division, VSSC and Metallography facilities of PSG College, Coimbatore; VSSC and LPSC for their excellent support. The support extended by the IPRC, Mahendiragiri, Material testing team, for low-temperature test (77 K) is gratefully acknowledged.
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Funding was provided by ICAMPS 2018.
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Arumugam, M., Ramesh Narayanan, P. & Muthupandi, V. Effect of Quench Delay on Low-Temperature Mechanical Properties of Aluminium Alloy AA2219 Hand Forgings. Trans Indian Inst Met 72, 1475–1479 (2019). https://doi.org/10.1007/s12666-019-01617-z
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DOI: https://doi.org/10.1007/s12666-019-01617-z