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Journal of Materials Engineering and Performance

Erschienen in:

19.10.2018

Development of Stretch Flangeable Grade Steels by Inclusion Engineering Approach

verfasst von: G. K. Mandal, K. Ashok, S. K. Das, P. Biswas, R. B. Sarkar, R. Sundara Bharathy, V. C. Srivastava

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 11/2018

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Abstract

The demand for good stretch flangeability in high-strength automotive steels has necessitated due attention on steel cleanliness and processes. The presence of elongated MnS stringers and centerline segregation of nonmetallic inclusions adversely affects the transverse mechanical property. In the present investigation, stretch flangeability of industrially produced steel, with and without Ca treatment, has been compared with Ti-added steel, produced at 40 kg scale without Ca treatment. The study brings out the influence of centerline segregation and modification of nonmetallic inclusions on HER performance. The microstructural analysis of industrial steel revealed that the method of hole formation (punching/drilling) determines crack initiation mechanism. The inclusions, along with the second phase present in the centerline, drive the crack propagation. An addition of Ti in liquid steel promotes formation of Al-Ti-O-based oxide, prior to MnS precipitation, during solidification and acts as nucleation site for MnS inclusion. This obviates the elongated stringer-type MnS inclusions. The centerline segregation-free Ti-modified steel, prepared at the laboratory scale, showed consistent HER property compared with industrial steel. It is also concluded that calcium treatment can be circumvented by modifying the sulfide stringer with the addition of Ti in the steel for further improvement in HER property.

Vorheriger Artikel Laser Powder Deposition Parametric Optimization and Property Development for Ti-6Al-4V Alloy

Nächster Artikel Influence of Rotation Rate on Microstructure and Comprehensive Performance of FSWed Mg Alloy

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Titel: Development of Stretch Flangeable Grade Steels by Inclusion Engineering Approach
verfasst von: G. K. Mandal
K. Ashok
S. K. Das
P. Biswas
R. B. Sarkar
R. Sundara Bharathy
V. C. Srivastava
Publikationsdatum: 19.10.2018
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 11/2018
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3703-1

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