Abstract
Development of Dual Phase Microstructure in Medium Carbon Low Alloy Steel by Continuous Cooling Heat Treatment
Highlights
The demand for improved fuel economy while maintaining structural integrity and fracture toughness of steels with combination of unique mechanical properties such as high yield strength, fracture toughness and very high fatigue strength. This require the development of steels with unique microstructures. This has led to advanced high strength steels (AHSS) such as dual phase (DP) steels with better mechanical properties [1]
From these micrographs of the samples, we can see that the heat-treated steel has a dual phase microstructure of proeutectoid ferrite grains and upper bainite grains
It is apparent that the upper bainite grains are grown on the previous pearlite grains in the annealed sample
Summary
The demand for improved fuel economy while maintaining structural integrity and fracture toughness of steels with combination of unique mechanical properties such as high yield strength, fracture toughness and very high fatigue strength. This require the development of steels with unique microstructures. The first-generation advanced high strength steels are the dual phase (DP), Complex phase (CP) and transformation induced plasticity (TRIP) steels. These steels have several limitations such as lower tensile strength and fracture toughness than what is needed for significant weight reduction and energy savings in the 21st century structural components.
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