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Hydrogen embrittlement of austenitic stainless steels and temper embrittlement of a martensitic stainless steel have been studied by impact testing, metallography, and SEM fractography. New data for uncharged and hydrogen-charged specimens of Types 304L and 316L austenitic stainless steels show significant hydrogen effects on the impact behavior of both materials. The Type 316L specimens showed greater hydrogen effects and a more pronounced"ductile-to-brittle transition." Analysis of new and existing data for austenitic stainless steels suggests that a steel's susceptibility to hydrogen may be estimated on the basis of the magnitude of its ductile-to-brittle transition. Due to the roles played by slip planarity, transformation to martensite, and other strain rate sensitive factors, strict ordering of various steels' susceptibilities to hydrogen cannot be expected by this method. Nevertheless, the method may provide a reasonable alternative to thorough characterization of the effect of hydrogen on the mechanical properties of a given material. The Type 416 martensitic stainless steel specimens possessed a banded ferrite/tempered martensite microstructure. Non-embrittled specimens exhibited a microvoid coalescence mode of fracture. The temper embrittlement mechanism promoted transgranular fracture of the tempered martensite phase. In the banded microstructure, ferrite/ferrite and ferrite/tempered martensite interfaces were extraordinarily weak. Their failure early in the deformation process promoted ductility by permitting relaxation of constraint on the tempered martensite phase. Tempering condition, impact data, and hardness data were correlated in order to specify a maximum acceptable hardness for a given minimum service temperature. / M.S.

A dissertation submitted to the faculty of engineering, University of the Witwatersrand, Johannesburg in fulfillment of the requirements for the degree of master of science / Steel 3CR12 is a 12 chromium, titanium stabilized, corrosion resisting steel which was developed in South Africa in the recent past (Abbreviation abstract) / AC2017

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1979. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Vita. / Includes bibliographical references. / by Jose Antonio Rescalvo Santiago. / Ph.D.

Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Includes bibliographical references. / M.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1980. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by Gerald Frank Zamiski. / M.S.

Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Vita. / Includes bibliographical references. / Ph.D.

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Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2010. / Committee Chair: David L. McDowell; Committee Member: G. B. Olson; Committee Member: K. A. Gall; Committee Member: Min Zhou; Committee Member: R. W. Neu. Part of the SMARTech Electronic Thesis and Dissertation Collection.