Carbide-Free Bainitic Weld Metal: A New Concept in Welding of Armor Steels

Carbide-free bainite, a fine mixture of bainitic ferrite and austenite, is a relatively recent development in steel microstructures. Apart from being very strong and tough, the microstructure is hydrogen-tolerant. These characteristics make it well-suited for weld metals. In the current work, an arm...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2014-12, Vol.45 (6), p.2327-2337
Main Authors: Krishna Murthy, N., Janaki Ram, G. D., Murty, B. S., Reddy, G. M., Rao, T. J. P.
Format: Article
Language:English
Subjects:
Applied sciences
Armor
Austenitic stainless steel
Ballistics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Exact sciences and technology
Ferrite
High strength steels
Joining, thermal cutting: metallurgical aspects
Materials Science
Metallic Materials
Metals. Metallurgy
Microstructure
Nanotechnology
Process metallurgy
Production of metals
Steels
Structural Materials
Surfaces and Interfaces
Thin Films
Weld metal
Welded joints
Welding
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Summary:Carbide-free bainite, a fine mixture of bainitic ferrite and austenite, is a relatively recent development in steel microstructures. Apart from being very strong and tough, the microstructure is hydrogen-tolerant. These characteristics make it well-suited for weld metals. In the current work, an armor-grade quenched and tempered steel was welded such that the fusion zone developed a carbide-free bainitic microstructure. These welds showed very high joint efficiency and ballistic performance compared to those produced, as per the current industrial practice, using austenitic stainless steel fillers. Importantly, these welds showed no vulnerability to cold cracking, as verified using oblique Y-groove tests. The concept of carbide-free bainitic weld metal thus promises many useful new developments in welding of high-strength steels.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-014-0120-1