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Investigation of the Effects of Different Types of Investments on the Alpha‐Case Layer of Ti6Al7Nb Castings
Author(s) -
Altindis Mustafa,
Hagemann Katrin,
Polaczek Andreas Bührig,
Krupp Ulrich
Publication year - 2011
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201000264
Subject(s) - materials science , investment casting , metallurgy , layer (electronics) , alloy , casting , hardening (computing) , titanium alloy , alpha (finance) , investment (military) , composite material , mold , business , construct validity , marketing , patient satisfaction , politics , political science , law
The effects of four different types of investment on the alpha‐case layer of Ti6Al7Nb (Ti67) castings are summarized. The formation mechanism of the alpha‐case layer is investigated. Four different investment materials are compared. The alpha‐case layers on castings produced with Invest‐TiT, Al 2 O 3 , and ZrSiO 4 ‐based investments comprise an oxide layer, an alloy layer, and a hardening layer, and are not only formed by interstitial oxygen but also by substitutional elements dissolved from mould materials. The Y 2 O 3 ‐based investment material provides the most‐reliable choice for the production of titanium castings and is beneficial for the casting of Ti67 because of no alpha‐case formation.