S
Steven S. Hansen
Researcher at Bethlehem Steel
Publications - 19
Citations - 691
Steven S. Hansen is an academic researcher from Bethlehem Steel. The author has contributed to research in topics: Austenite & Microalloyed steel. The author has an hindex of 10, co-authored 19 publications receiving 650 citations.
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Journal ArticleDOI
Niobium carbonitride precipitation and austenite recrystallization in hot-rolled microalloyed steels
TL;DR: In this paper, the response of austenites to thermomechanical treatments is studied in a series of niobium (columbium) HSLA steels.
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Carbonitride precipitation in niobium/vanadium microalloyed steels
TL;DR: In this paper, a detailed study of carbonitride precipitation in niobium/vanadium microalloyed steels is presented, where a thermodynamic model is developed to predict the austenite/carbonitride equilibrium in the Fe−Nb-V-C-N system, using published solubility data and the Hillert/Staffansson model for stoichiometric phases.
Journal ArticleDOI
Austenite recrystallization and carbonitride precipitation in niobium microalloyed steels
John G. Speer,Steven S. Hansen +1 more
TL;DR: In this paper, the response of austenite to thermomechanical treatment is investigated in two series of niobium microalloyed steels, and it was found that a lower carbon concentration results in faster austenites recrystallization, due to a smaller carbonitride supersaturation, which leads to a reduced precipitate nucleation rate.
Journal ArticleDOI
The boron hardenability effect in thermomechanically processed, direct-quenched 0.2 Pct C steels
K. A. Taylor,Steven S. Hansen +1 more
TL;DR: In this paper, the segregation and precipitation of boron have been studied in thermomechanically processed 0.2C-0.5Mo steels containing nominally 0, 10, 20, 50, and 100 ppm B.
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Effect of the Ti/N ratio on the hardenability and mechanical properties of a quenched-and-tempered C-Mn-B steel
Yulin Shen,Steven S. Hansen +1 more
TL;DR: In this article, the volume fraction of coarse (greater than 1 µm) TiN particles was measured in all steels using quantitative metallographic techniques, and the results showed that a complete boron (B) hardenability effect is obtained with Ti/N ratios ≥ 2.9, a value slightly below the stoichiometric Ti/n ratio of 3.4.