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what is strain sensitivity factor

I think you mean "strain rate sensitivity" which is usually expressed by the slope of a curve of flow stress vs. strain rate on log-log coordinates; that is, the derivative of the log of the flow stress with respect to the log of the strain rate. If this slope is high it means that the flow stress varies a lot with strain rate. The article fails to mention the early work in the field, which should be cited in the references. Particularly, someone needs to look up and summarize the early work in the 1960s and '70s by Prof. Walter Backofen of MIT and his coworkers. Taylour (talk) 19:20, 15 May 2009 (UTC)

Section on Ti and Ti alloys seems to be direct copy of research and needs editing as well.[edit]

The sections about superplastic forming need editing in several places for thins like incomplete sentences. More importantly much of the text in this section looks like a direct copy of a research paper. There are even several instances of the text referencing a figure which is not included. (talk) 20:19, 7 December 2013 (UTC)BGRIFFIN

graphic versus graphite?[edit]

The term "graphic coated blank" appears three times in the article. I do not understand how graphics would be relevant to metal forming. Did someone mean graphite coated blank? (talk) 04:43, 15 November 2015 (UTC)