Analysis of Microstructures and Mechanical Properties of Two Hot Dip Galvanized Dual-Phase Steels with Different Alloy Systems

Shuang Kuang; Xiu Mei Qi; Yun Han

doi:10.4028/www.scientific.net/AMM.624.198

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 624Analysis of Microstructures and Mechanical...

Analysis of Microstructures and Mechanical Properties of Two Hot Dip Galvanized Dual-Phase Steels with Different Alloy Systems

Abstract:

The microstructures and mechanical properties of a high carbon DP steel and a low carbon Nb microalloying DP steel were investigated. The two types of DP steels have both qualified to meet European standard performance. But the high carbon content DP steel exhibits relatively low elongation and low hole expansion rate as well as poor bending performance. The martensite island in high carbon DP steel appears obvious band structure, and the size of martensite islands is big. Contrary, the matensite islands in low carbon and Nb microalloying DP steel are dispersed and fine, which lead to perfect comprehensive performance.