Low Transverse Ductility in a New High-Strength Corrosion-Resistant Steel: Microstructure and Texture

Development of ultrahigh-strength steels having optimum combination of high ultimate tensile strength, fracture toughness and corrosion resistance has gained much importance due to emerging applications in the aerospace, medical and automobile industries. Indigenous development program of such steel...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2019-06, Vol.72 (6), p.1453-1457
Main Authors: Poojari, Govardhana, Kar, Sujoy Kumar, Singh, Shiv Brat, Kadavil, Thomas Tharian, Anoop, C. R.
Format: Article
Language:English
Subjects:
Aerospace industry
Aerospace materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion resistance
Corrosion resistant steels
Ductility
Fracture toughness
High strength
Inclusions
Inhomogeneity
Materials Science
Metallic Materials
Microstructure
Reduction
Specifications
Steel
Technical Paper
Texture
Tribology
Ultimate tensile strength
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Summary:Development of ultrahigh-strength steels having optimum combination of high ultimate tensile strength, fracture toughness and corrosion resistance has gained much importance due to emerging applications in the aerospace, medical and automobile industries. Indigenous development program of such steel has been started in India. Initial heats have been prepared following the standard processing route, and it was found that while they showed very high strength (1725–1757 MPa), ductility in the transverse direction (13–32% reduction in area) was lower than specification (minimum 35% reduction in area). Poor texture was initially believed to be the possible reason for this low transverse ductility. Hence, investigative characterization work was taken up to understand this effect in different heats of Aerospace Material Specification (AMS5936 C) steel samples. In this paper, it would be conclusively discussed how microstructural inhomogeneity and the presence of inclusions became overpowering reasons for poor transverse ductility as compared with the textural reasons in indigenous material.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-019-01571-w