2012.02.24

Prof. Frank Ernst
       Department of Materials Science and Engineering
       Case Western Reserve University, U.S.A

Title：Surface Engineering of Alloys by Colossal Super saturation with Interstitials

Abstract：
Properties of structural alloys (particularly austenitic stainless steel) can be considerably improved by infusing high concentrations of interstitial atoms from the surface. By exposing the alloy surface to a gas atmosphere providing carbon or nitrogen under socalled ara-equilibrium・conditions, these species can be interstitially dissolved to concentrations exceeding the equilibrium solubility limit by 100,000 times and without precipitating second phases (carbides/nitrides), which are often detrimental to alloy properties. This presentation will explain the physical principles and processing methods enabling such "surface engineering through colossal supersaturation" and demonstrate accomplished property improvements for a variety of alloys.

Schedule：February 24, 2012 (Friday) 15:00 to 16:30
place：Auditorium, 1st floor, Eng. Bldg. #9, Hongo Campus

Attached file： The 90th open seminar.pdf