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Date: 04/22/03 at 4:16 PM
Posted by: David Pye
E-mail: pyemet@toocity.net

In Reply to: 4140H Austempered posted by Hayden Burvill on 04/17/03 at 4:31 PM:

Dear Hayden,
What was the austenitizing temperature of the parts prior to austempering. The austemper temperature seems low for 4140 at 430F. That would be more like a marquench. The MS point on 4140 is approximatly 650F on the isothermal temperature transformation diagram. The structure that you have is probably untempered martensite and not bainite.Hence the brittle failure fracture.
Best Regards to you, David

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  Re: 4140H Austempered Hayden Burvill   Posted at: 04/22/03 (0)

  Re: 4140H Austempered Hayden Burvill   Posted at: 04/22/03 (0)

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