Skip to main content Accessibility help
×
Home
Hostname: page-component-558cb97cc8-vrcgq Total loading time: 0.354 Render date: 2022-10-06T23:40:00.401Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "useRatesEcommerce": false, "displayNetworkTab": true, "displayNetworkMapGraph": true, "useSa": true } hasContentIssue true

Microstructure and Tensile Ductility of a Ti-43Al-4Nb-1Mo-0.1B Alloy

Published online by Cambridge University Press:  28 August 2018

Laura M. Droessler
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria
Thomas Schmoelzer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria
Wilfried Wallgram
Affiliation:
Bohler Schmiedetechnik GmbH&CoKG, Mariazeller Str. 25, A-8605 Kapfenberg, Austria
Limei Cha
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria
Gopal Das
Affiliation:
Pratt & Whitney, 400 Main Street M/S 114-43, East Hartford, CT 06108, USA
Helmut Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria
Get access

Abstract

The microstructural development of a forged Ti-43Al-4Nb-1Mo-0.1B (in at%) alloy during two-step heat-treatments was investigated and its impact on the tensile ductility at room temperature was analyzed. The investigated material, a so-called TNM gamma alloy, solidifies via the β-route, exhibits an adjustable β/B2-phase volume fraction and can be forged under near conventional conditions. Post-forging heat-treatments can be applied to achieve moderate to near zero volume fractions of β/B2-phase allowing for a controlled adjustment of the mechanical properties. The first step of the heat-treatment minimizes the β/B2-phase and adjusts the size of the α-grains, which are a precursor to the lamellar γ/α2-colonies. However, due to air cooling after the first annealing step, the resulting microstructure is far from thermodynamic equilibrium. Therefore, a second heat-treatment step is conducted below the eutectoid temperature which brings the microstructural constituents closer to thermodynamic equilibrium. It was found that temperature and duration of the second heat-treatment step critically affect the solid-state phase transformations and, thus, control the plastic fracture strain at room temperature. Scanning and transmission electron microscopy studies as well as hardness tests have been conducted to characterize the multi-phase microstructure and to study its correlation to the observed room temperature ductility.

Type
Articles
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Kestler, H., Clemens, H., in Titanium and Titanium Alloys, edited by Leyens, C., Peters, M. (WILEY-VCH, Weinheim, 2003), pp. 351392.Google Scholar
[2] Clemens, H., Chladil, H.F., Wallgram, W., Böck, B., Kremmer, S., Otto, A., Güther, V., Bartels, A., in Structural Aluminides for Elevated Temperature Applications, edited by Kim, Y.W., Morris, D., Yang, R., Leyens, C., (The Minerals, Metals and Materials Society (TMS), Warrendale, 2008), pp. 217228.Google Scholar
[3] Clemens, H., Wallgram, W., Kremmer, S., Güther, V., Otto, A., Bartels, A., Adv. Eng. Mater. 10, 707 (2008).CrossRefGoogle Scholar
[4] Wallgram, W., Kremmer, S., Clemens, H., Otto, A., Güther, V., these proceedings.Google Scholar
[5] Güther, V., Otto, A., Klose, J., Rothe, C., Clemens, H., Kachler, W., Winter, S., Kremmer, S., in Structural Aluminides for Elevated Temperature Applications, edited by Kim, Y.W., Morris, D., Yang, R., Leyens, C., (The Minerals, Metals and Materials Society (TMS), Warrendale, 2008), pp. 249256.Google Scholar
[6] Droessler, L.M., Characterization of β-Solidifying γ-TiAl Alloy Variants Using Advanced Inand Ex-Situ Investigation Methods, (Diploma thesis, Montanuniversität Leoben, 2008).Google Scholar
[7] Clemens, H., Boeck, B., Wallgram, W., Schmoelzer, T., Droessler, L.M., Zickler, G.A., Leitner, H., Otto, A., these proceedings.Google Scholar
[8] Huang, Z.W., Acta Mater. 56, 1689 (2008).Google Scholar
[9] Mitao, S., Bendersky, L.A., Acta Mater. 45, 4475 (1997).CrossRefGoogle Scholar
[10] Clemens, H., Wallgram, W., Schmoelzer, T., Droessler, L., Cha, L., Das, G., Intermetallics (in preparation).Google Scholar
[11] Bendersky, L.A., Boettinger, W.J., Burton, B.P., and Biancaniello, F.S., and Shoemaker, C.B., Acta Mater. 38, 931 (1990).Google Scholar
[12] G.Das and Snow, D.B., Unpublished results, (2008).Google Scholar
[13] Cha, L., Scheu, C., Clemens, H., Chladil, H.F., Dehm, G., Gerling, R., Bartels, A., Intermetallics 16, 868 (2008).CrossRefGoogle Scholar
[14] Blackburn, M.J., in The Science, Technology and Application of Titanium Alloys, edited by Jaffee, R.I., Promisel, N.E., (Plenum Press, New York, 1970), pp. 633.CrossRefGoogle Scholar

Save article to Kindle

To save this article to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Microstructure and Tensile Ductility of a Ti-43Al-4Nb-1Mo-0.1B Alloy
Available formats
×

Save article to Dropbox

To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.

Microstructure and Tensile Ductility of a Ti-43Al-4Nb-1Mo-0.1B Alloy
Available formats
×

Save article to Google Drive

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

Microstructure and Tensile Ductility of a Ti-43Al-4Nb-1Mo-0.1B Alloy
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *