NDLI: The Effect of Microstructure and Pre-strain on the Change in Apparent Young’s Modulus of a Dual-Phase Steel

Content Provider	Springer Nature Link
Author	Kupke, A. Hodgson, P. D. Weiss, M.
Copyright Year	2017
Abstract	The elastic recovery in dual-phase (DP) steels is not a linear process and changes with plastic deformation. The level of change in the apparent Young’s modulus has been reported to depend on material composition and microstructure, but most previous experimental studies were limited to industrial DP steels and led to contradicting results. This work represents a first fundamental study that investigates the separate and combined effect of phase volume fraction and hardness on the change in apparent Young’s modulus in DP steel. A common automotive DP steel (DP780) is heat treated to obtain seven different combinations of martensite and ferrite volume fraction and hardness while keeping the chemical composition as well as the shape of the martensite and ferrite phases unchanged. Loading-unloading tests were performed to analyze the chord modulus at various levels of pre-strain. The results suggest that the point of saturation of the chord modulus with pre-strain depends on the morphology of the microstructure, occurring earlier for microstructures consisting of ferrite grains surrounded by martensite laths. It is further revealed that the reduction of the apparent Young’s modulus, which is the difference between the material’s initial Young’s modulus and the chord modulus, increases with martensite hardness if the martensite volume fraction is kept constant. A higher martensite volume fraction initially elevates the reduction of the apparent Young’s modulus. After a critical volume fraction of martensite phase of 35%, a decrease in apparent Young’s modulus reduction was observed. A comparison of the plastic unloading strain suggests that the mechanisms leading to a reduction in apparent Young’s modulus are strongest for the microstructure consisting of 35% martensite volume fraction.
Starting Page	3387
Ending Page	3398
Page Count	12
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	26
Issue Number	7
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2017-05-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	AHSS apparent Young’s modulus dual-phase loading-unloading microstructure nano-hardness Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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