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Title: Analysis of Abrasive Blasting of DOP-26 Iridium Alloy

Abstract

The effects of abrasive blasting on the surface geometry and microstructure of DOP-26 iridium alloy (Ir-0.3% W-0.006% Th 0.005% Al) have been investigated. Abrasive blasting has been used to control emissivity of components operating at elevated temperature. The effects of abrasive blasting conditions on surface morphology were investigated both experimentally and by numerical modeling. The simplified model, based on finite element analysis of a single angular particle impacting on Ir alloy disk, calculates the surface deformation and residual strain distribution. The experimental results and modeling results both indicate that the surface geometry is not sensitive to the abrasive blast process conditions of nozzle pressure and standoff distance considered in this study. On the other hand, the modeling results suggest that the angularity of the abrasive particle has an important role in determining surface geometry, which in turn, affects the emissivity. Abrasive blasting causes localized surface strains and localized recrystallization, but it does not affect grain size following extended exposure at elevated temperature. The dependence of emissivity of the DOP-26 alloy on mean surface slope follows a similar trend to that reported for pure iridium.

Authors:
 [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1045220
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Refractory Metals and Hard Materials; Journal Volume: 35
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABRASIVES; ALLOYS; DEFORMATION; DISTRIBUTION; EMISSIVITY; EXPLOSIVE FRACTURING; GEOMETRY; GRAIN SIZE; IRIDIUM; IRIDIUM ALLOYS; MICROSTRUCTURE; MORPHOLOGY; NOZZLES; RECRYSTALLIZATION; SIMULATION; STRAINS; iridium alloy; abrasive blast; emissivity; finite element modeling

Citation Formats

Ohriner, Evan Keith, Zhang, Wei, and Ulrich, George B. Analysis of Abrasive Blasting of DOP-26 Iridium Alloy. United States: N. p., 2012. Web. doi:10.1016/j.ijrmhm.2012.05.002.
Ohriner, Evan Keith, Zhang, Wei, & Ulrich, George B. Analysis of Abrasive Blasting of DOP-26 Iridium Alloy. United States. doi:10.1016/j.ijrmhm.2012.05.002.
Ohriner, Evan Keith, Zhang, Wei, and Ulrich, George B. Sun . "Analysis of Abrasive Blasting of DOP-26 Iridium Alloy". United States. doi:10.1016/j.ijrmhm.2012.05.002.
@article{osti_1045220,
title = {Analysis of Abrasive Blasting of DOP-26 Iridium Alloy},
author = {Ohriner, Evan Keith and Zhang, Wei and Ulrich, George B},
abstractNote = {The effects of abrasive blasting on the surface geometry and microstructure of DOP-26 iridium alloy (Ir-0.3% W-0.006% Th 0.005% Al) have been investigated. Abrasive blasting has been used to control emissivity of components operating at elevated temperature. The effects of abrasive blasting conditions on surface morphology were investigated both experimentally and by numerical modeling. The simplified model, based on finite element analysis of a single angular particle impacting on Ir alloy disk, calculates the surface deformation and residual strain distribution. The experimental results and modeling results both indicate that the surface geometry is not sensitive to the abrasive blast process conditions of nozzle pressure and standoff distance considered in this study. On the other hand, the modeling results suggest that the angularity of the abrasive particle has an important role in determining surface geometry, which in turn, affects the emissivity. Abrasive blasting causes localized surface strains and localized recrystallization, but it does not affect grain size following extended exposure at elevated temperature. The dependence of emissivity of the DOP-26 alloy on mean surface slope follows a similar trend to that reported for pure iridium.},
doi = {10.1016/j.ijrmhm.2012.05.002},
journal = {International Journal of Refractory Metals and Hard Materials},
number = ,
volume = 35,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2012},
month = {Sun Jan 01 00:00:00 EST 2012}
}