Phases quantification in DP600 steel welded by GTAW process using SEM and atomic force microscopy

The automotive industry is constantly under several challenges in many aspects, such as development of new materials and improvement their manufacturability. In order to achieve light weight, reduced emissions and ensure conductor safety, advanced high strength steels (AHSS) are able to fulfill thes...

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2017-10, Vol.20 (5), p.1161-1165
Main Authors: Medina, G.Y. Pérez, Delgado, E. Hurtado, Pérez, A. F. Miranda, Ferreira, H. Lopez
Format: Article
Language:English
Subjects:
AFM
AHSS
Atomic force microscopy
Automobile industry
Automotive bodies
Automotive engineering
Bainite
Base metal
Conductors
DP steels
Dual phase steels
Duplex stainless steels
ENGINEERING, CHEMICAL
Gas tungsten arc welding
GTAW
Heat affected zone
High strength steels
Image analysis
Iron constituents
Manufacturability
Martensite
MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials selection
METALLURGY & METALLURGICAL ENGINEERING
Morphology
Optical microscopy
Phases
Scanning electron microscopy
SEM
Weight reduction
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Summary:The automotive industry is constantly under several challenges in many aspects, such as development of new materials and improvement their manufacturability. In order to achieve light weight, reduced emissions and ensure conductor safety, advanced high strength steels (AHSS) are able to fulfill these requirements. Dual phase steels (DP) are well suited for light weighing car body constructions. The gas tungsten arc welding (GTAW) process is focused in literature as an alternative choice for joining AHSS steels; this study is held to disclose the exhibited microstructural constituents. In addition, quantitative determinations of the volume % of phases in the various weld regions were made. The relative amounts of lower bainite (LB), upper bainite (UB), and polygonal ferrite (PF) in the heat affected zone (HAZ) were determined by image analysis from optical microscopy (OM) and scanning electron microscopy (SEM). It was found that GTAW promoted the development of significant amounts of LB in the HAZ (50.89 %). In contrast atomic force microscopy (AFM) leads to quantify the different phases by the morphology, height and roughness, it was found that martensite (M) dropped down to 7.5% in the intercritical zone (IZ) although PF increases to 92.5% compared with the base metal (BM).
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2016-0172