Metallurgical optimization of the HFQ® process for AA7075-F sheets

  • Francesco Guarracino

Student thesis: Phd

Abstract

This thesis discusses the use of high-strength aluminium alloys as an alternative to steel in car body panels to reduce environmental impact and enhance passenger safety. However, manufacturing challenges arise in forming and heat treating these alloys. The HFQ® hot stamping process is proposed as a solution, but the heat treatment parameters still need optimization. The study utilizes various techniques such as microscopy, x-ray scattering, and calorimetry to characterize the alloys. Tensile tests and stress corrosion cracking experiments evaluate mechanical and corrosion properties. The optimal solution heat treatment duration depends on the heating rate, and reducing the cooling rate improves corrosion resistance without compromising hardening potential. Multi-step aging strategies can also decrease aging duration while maintaining good properties.
Date of Award31 Dec 2023
Original languageEnglish
Awarding Institution
  • The University of Manchester
SupervisorXiaorong Zhou (Supervisor) & Joseph Robson (Supervisor)

Keywords

  • HFQ®
  • Aluminium alloys
  • Heat treatments

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