Celox Oxygen Activity probe

Readers of my recent post:

"Optimizing deoxidation and desuIphurization during vacuum induction melting of alloy 718"

full paper free to members of IOM3,UK is now online and freely available to members of IOM3.

Readers new to Superalloys and steel cleanness via Sulphur & Oxygen removal may also wish to read about Oxygen Activity Mesurement probes. The one I am particularily familiar with is the Celox Oxygen Activity probe. In many ways our/my introduction and systematic use of the Celox probe in the production process, undoubtably added credibility to the companies product,

The Celox Oxygen Activity Measurement Probe

Comments or requests for information on Oxygen Activity Measurement  and related are most welcome.

Cheers & Enjoy
JA.

Malcolm McLean Memorial Symposium: “The superalloys: from processing to performance” Putting the Heat on Coal-Fired Power Generation_ Materials, Steel

In an earlier post (13 May 2009): Putting the Heat on Coal-Fired Power Generation_ Materials, Steels, Superalloys, Coatings to fight GHG Emissions? Information overload assistance. I chose to lean on the paper by T.B. Gibbons, brought to me by my professional Institute IOM3.

It allowed me to address, to some extent, my own preoccupation with a local project (Coal Resource reputed to be the largest in Europe) and to up-date my own early experience in the special steels and alloys field (Ni-based superalloys) also gained in a famous local company Imphy(58) France, now a jointly owned by Arcelor-Mittal for the steelmaking-melting activity and Eramet-Aubert and Duval superalloy activity.

Following exchange with the author Tom Gibbons cf. comments reported on the above post link comment section in post footnotes. Tom felt I should reference all the authors. In fact I did think of reviewing some other, if I found enough time-intricate serious stuff. I immediately returned to the conference papers only to realise that I had not scrolled to the bottom of the page of online papers. Instead of choosing one of 5, I had inadvertently chosen only one of 22 top notch papers!
In fact I was lucky, I believe that in the face of such rich resources I may have been overwhelmed by this impressive work, despite my own long experience and many not have opened a dialogue.

The full reference overview:

All 22 conference papers presented at the Malcolm McLean Memorial Symposium: “The superalloys: from processing to performance”) by internationally recognised experts in the field have been issued in a special addition of Materials Science and Technology Vol 25 Feb 2009. [almost 200 pages on all aspects of superalloy process and product metallurgy;from R&D, through primary and secondary melting, casting and single crystal growth, hot-transformation (rolling, forging etc), critical properties at high-temperatures in stressful and corrosive environments have all been addressed to meet the highest standards and client requirements and rightly claim the conference title superalloys: from processing to performance"

Other resources: cf. Videos on Superalloy special melt processing and hot transformation on the LHS vertical menu bar, "NEW: Video_Metallurgical Processes-Superalloys"

Related Posts:

1. Global Materials Resources-China's Journal of Materials Science and Technology and Acta Metallurgica Sinica plus comments on Superalloy Melting (9 June 2009)

2. Materials Science and Technology, Feb. 1985, Vol 1- 1st Issue.

Global Materials Resources-China's Journal of Materials Science and Technology and Acta Metallurgica Sinica plus comments on Superalloy Melting

I am pleased to bring to the (further?) attention of the Materials Science and Engineering community, these two titles from China's Materials Science and Technology community,
1. The Journal of Materials Science and Technology
2. Acta Metallurgica Sinica.

Don't be put-off with either the slow download time not one or two broken links...

Cheers for their effort,

NB. I trust I may eventually receive a response from the author to my original enquiry which brought me to their site in the first place:

"Desulphurization during VIM Refining Ni-base Superalloy using CaO Crucible" in China's JMST.

Link to My Record of Comment

Comment reproduced:

"I am surprised that my earlier work is not referenced in such work: J. ALEXANDER: "Optimizing deoxidation and desulphurization during vacuum induction melting of alloy 718", & MATER. SCI. TECHNOL. 1985, 1(2), 167-70. Some online references may be found via my pages: http://materialsscienceengineeringdefined.blogspot.com/ Either search VIM or direct link: J. ALEXANDER: "Optimizing deoxidation and desulphurization during vacuum induction melting of alloy 718", & MATER. SCI. TECHNOL. 1985, 1(2), 167-70

Nice to know that others have become interested in such themes [after all this time]. "
Comment by the author of MATER. SCI. TECHNOL. 1985, 1(2), 167-70 and author of these weblog pages.

PS. There is still (understandably) much discretion by manufacturers on how to achieve "Clean, very low oxygen, dissolved(gas) and total oxygen, (the latter includes oxide particles) together with very low sulphur (mostly oxysulfides) not to mention the very low harmful trace elements obtained in today's large size VIM melting facilities despite low surface to volume ratio limiting mass transfer and chemical exchange withe the vacuum atmosphere.

Yet all the above melt specification, so important for superalloy manufacturing, can be achieved.

cf. Past Boiling Point, Materials World 1 June 2009 by Gaylord Smith, Brian Baker, Lewis Shoemaker of Special Metals Corporation, R & D, Huntingdon, West Virginia, USA who describe the developments of INCONEL alloy 740, suitable for use in the high temperature environments of supercritical boilers for energy generation.

Full article currently available only to IOM3 members, open to all with 2 month delay, I believe.

PS if the reader decides to joins IOM3 after reading my pages please mention your source and drop me a line.