Microstructure and mechanical properties of spheroidized D6AC steel

The influence of spheroidization on the microstructure and mechanical properties of D6AC steel was investigated by means of dilatometry, micrograph analysis, and tensile testing. The continuous cooling transformation diagram was presented, and the critical cooling rate to obtain a fully martensitic...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2013-11, Vol.585, p.94-99
Main Authors: Lee, Young-Won, Son, Young-Il, Lee, Seok-Jae
Format: Article
Language:English
Subjects:
Applied sciences
Carbides
Cementite
Continuous-cooling-transformation (CCT) diagram
Cooling rate
Cross-disciplinary physics: materials science
rheology
D6AC steel
Elasticity and anelasticity
Elasticity. Plasticity
Exact sciences and technology
Hardness
Materials science
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Physics
Solid solutions
Spheroidization
Spheroidizing
Structural steels
Treatment of materials and its effects on microstructure and properties
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Summary:The influence of spheroidization on the microstructure and mechanical properties of D6AC steel was investigated by means of dilatometry, micrograph analysis, and tensile testing. The continuous cooling transformation diagram was presented, and the critical cooling rate to obtain a fully martensitic microstructure was determined. Undissolved Mo carbide particles in the martensite matrix were observed after the solid solution treatment at 860°C. The kinetics of the spheroidized cementite particles accelerated due to the carbide particles that were undissolved during the solid solution treatment. As the holding time for the spheroidization was increased, the total elongation increased, while the tensile strength and hardness were reduced according to a proportional relationship.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.07.040