contributor author | S. L. Semiatin | |
contributor author | P. D. Nicolaou | |
contributor author | J. P. Thomas | |
contributor author | T. J. Turner | |
date accessioned | 2017-05-09T00:28:12Z | |
date available | 2017-05-09T00:28:12Z | |
date copyright | April, 2008 | |
date issued | 2008 | |
identifier issn | 0094-4289 | |
identifier other | JEMTA8-27105#021001_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/138080 | |
description abstract | Mechanism-based models for the evolution of defects during the thermomechanical processing of aerospace titanium- and nickel-based alloys are reviewed. These defects include those comprising microstructural/metal-flow irregularities and those that are damage related (i.e., cracks and cavities). The development of undesirable/nonuniform microstructures and cavities during the mill processing of alpha/beta titanium alloys is addressed first. Relatively simple, diffusion-based models of spheroidization and coarsening are applied to quantify the propensity for microstructure nonuniformities. Similarly, first-order micromechanical models have been formulated to estimate the effect of local crystallographic texture on nonuniform flow, the generation of triaxial stresses, and cavity growth/closure in alpha/beta titanium alloys with a colony-alpha microstructure. The occurrence of nonuniform grain structures (and so-called ALA, or “as large as,” grains) in cast, wrought, and powder-metallurgy superalloys is also discussed. A physics-based model to treat the topology of recrystallization and the evolution of ALA grains in such materials is proposed. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Defect Occurrence and Modeling for the Thermomechanical Processing of Aerospace Alloys | |
type | Journal Paper | |
journal volume | 130 | |
journal issue | 2 | |
journal title | Journal of Engineering Materials and Technology | |
identifier doi | 10.1115/1.2840958 | |
journal fristpage | 21001 | |
identifier eissn | 1528-8889 | |
keywords | Alloys | |
keywords | Product quality | |
keywords | Recrystallization | |
keywords | Titanium alloys | |
keywords | Stress | |
keywords | Aerospace industry | |
keywords | Cavities | |
keywords | Thermomechanical treatment | |
keywords | Superalloys | |
keywords | Diffusion (Physics) | |
keywords | Modeling | |
keywords | Cavitation AND Nickel | |
tree | Journal of Engineering Materials and Technology:;2008:;volume( 130 ):;issue: 002 | |
contenttype | Fulltext | |