Effects of Nb Modification and Cooling Rate on the Microstructure in an Ultrahigh Carbon Steel
| Autor: | Yoosuf N. Picard, Bryan A. Webler, Matthew D. Hecht |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Austenite
Materials science Structural material Carbon steel Scanning electron microscope Cementite Metallurgy Metals and Alloys chemistry.chemical_element 02 engineering and technology engineering.material Condensed Matter Physics Microstructure 020501 mining & metallurgy chemistry.chemical_compound 0205 materials engineering chemistry Mechanics of Materials Phase (matter) engineering Carbon |
| Zdroj: | Metallurgical and Materials Transactions A. 49:2161-2172 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-018-4588-1 |
| Popis: | In this study, two different melting methods were used to investigate effects of Nb modification on microstructure in ultrahigh carbon steel (UHCS). Nb-free and Nb-modified UHCS samples were produced by melting and resolidifying an industrially produced base UHCS with and without addition of Nb powder. Microstructure was characterized using scanning electron microscopy, X-ray diffraction, and electron dispersive spectroscopy. Equilibrium computations of phase fractions and compositions were utilized to help describe microstructural changes caused by the Nb additions. Nb combined with C to form NbC structures before and during austenite solidification, reducing the effective amount of carbon available for the other phases. Cementite network spacing in the Nb-free samples was controlled by the cooling rate during solidification (faster cooling led to a more refined network). Network spacing in the Nb-modified UHCS could be enlarged by NbC structures that formed cooperatively with austenite. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink