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Chemistry, Design, and Processing of Two-Stage Trip Steel
Başlık:
Chemistry, Design, and Processing of Two-Stage Trip Steel
Yazar:
Field, Daniel Morye, author.
ISBN:
9780438111585
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (175 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: David C. Van Aken Committee members: William G. Fahrenholtz; Julia E. Medvedeva; Matthew J. O'Keefe; Ronald J. O'Malley.
Özet:
A regular solution model was developed to calculate the chemical driving force for alpha-martensite formation, DeltaGgamma→alpha Chem. A model for the strain energy, Delta Ggamma→alphaStr, was formulated utilizing the Young's modulus (E), lattice misfit squared (delta2), and molar volume (O) which opposed the chemical driving force for alpha-martensite formation. The M alphaS was determined at a temperature at which DeltaGgamma→alpha Chem + DeltaGgamma→alpha Str = 0. In conjunction with a previously developed epsilon-martensite model, a means of predicting the volume fraction of gamma-austenite was determined; and it was shown that for values of DeltaMs < 0, defined as Msepsilon -- Msalpha produced the greatest amounts of retained gamma-austenite in the as quenched microstructure. These models were tested, and confirmed, with a new alloy formulated to produce a steel with chromium replacing the traditional aluminum to obtain a DeltaMs = --100 C° that exhibited the two-stage TRIP behavior. From this substitution the dynamic strain aging response could be mitigated through M23(C,N)6 precipitation trapping carbon and nitrogen. The work hardening behavior of these steels was found to be due to the Stage II (epsilon→alpha) martensitic reaction and not the dynamic strain aging of the steels. Eight medium-Mn steels were processed and it was found that when the intrinsic stacking fault energy was less than 10.5 mJ/m2 the two-stage TRIP response was activated. Empirical relationships for the strength and ductility were determined for the two-stage TRIP steels. The developed models have been used to optimize alloy composition and a designed steel with composition Fe-13.8Mn-1.0Si-3.0Cr-0.15C-0.003N (wt. pct.) is recommended for future investigation.
Notlar:
School code: 0587
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
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