Effect of Temperature and Dynamic Loading on the Mechanical Properties of Copper-Alloyed High-Strength Interstitial-Free Steel

Crash resistance and formability relevant mechanical properties of a copper-alloyed interstitial-free (IF) steel processed under various conditions of batch annealing (BA), continuous annealing (CA), and postcontinuous annealing aging have been studied in a wide range of strain rate (3.33 × 10 −4 to...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2009-04, Vol.40 (4), p.856-866
Main Authors: Rana, R., Singh, S.B., Bleck, W., Mohanty, O.N.
Format: Article
Language:English
Subjects:
Alloys
Annealing
Applied sciences
Automotive materials
Characterization and Evaluation of Materials
Chemistry and Materials Science
Exact sciences and technology
Hot rolling
Iron
Materials Science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic Materials
Metallurgy
Metals. Metallurgy
Nanotechnology
Precipitation hardening
Solid solutions
Steel
Strain rate
Structural Materials
Surfaces and Interfaces
Temperature
Thin Films
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Summary:Crash resistance and formability relevant mechanical properties of a copper-alloyed interstitial-free (IF) steel processed under various conditions of batch annealing (BA), continuous annealing (CA), and postcontinuous annealing aging have been studied in a wide range of strain rate (3.33 × 10 −4 to 200 s −1 ) and temperature (−100 °C to +20 °C). These properties have been compared with similarly processed traditional mild and high-strength IF steels. Assessment of various parameters such as strength, elongation, strain rate sensitivity of stress, strain-hardening capacity, temperature sensitivity of stress, activation volume, and specific energy absorption of all these steels implies that copper-alloyed IF steel is soft and formable in CA condition. It can be made stronger and more crash resistant than the conventional mild- or high-strength IF steels when aged to peak strength after CA. Room-temperature strain rate sensitivity of stress of the investigated steels exhibits a two-stage behavior. Copper in solution in ferrite causes solid solution softening at low temperatures (≤20 °C) and at high strain rates (200 s −1 ).
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-008-9767-z