Effects of hydrogen on the properties of iron and steel
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Effects of Hydrogen on the Properties of Iron and Steel
J O H N P. H I R T H R. F. Mehl Medalist
The effects of hydrogen on the physical and mechanical properties of iron and steel are reviewed. A new mechanism for the cold work peak for hydrogen in iron is considered. Together, internal friction and mechanical properties indicate that hydrogen softens iron by enhancing screw dislocation mobility at room temperature but hardens iron by core interactions at low temperatures. No single mechanism exists for the degradation of the properties of steel by hydrogen. Instead a complex process involving many of the proposed mechanisms as contributing factors is shown to account for most degradation phenomena.
I. PREFACE
IT is with the greatest pleasure that I join in honoring Professor Robert Franklin Mehl by presenting this lecture. I had the good fortune of working with him while I was a graduate student and later an Assistant Professor at Carnegie Institute of Technology. Dr. Mehl provided inspiration to his associates through his eminence in metallurgy and through the high quality of his The Institute o f Metals Lecture was established in 1921, at which time the Institute of Metals Division was the only professional Division within the American Institute of Mining and Metallurgical Engineers. It has been given annually since 1922 by distinguished men from this country and abroad. Beginning in 1973 and thereafter, the person selected to deliver the lecture will be known as the "'Institute o f Metals Division Lecturer and R. F. Mehl Medalist ""for that year. JOHN PRICE HIRTH received his B.S. and M.S. degrees in Metallurgical Engineering from The Ohio State University in 1953. He obtained his Ph.D. degree from Carnegie Institute of Technology in 1958. He served in the U.S. Air Force from 1953-55; was a General Electric Research Fellow at Carnegie Institute of Technology, 1955-57; a Fulbright Research Fellow at Bristol University, England, 1957-58; and a research metallurgical engineer and assistant professor of Metallurgical Engineering at Carnegie from 1958-61. Dr. Hirth was appointed Mershon Associate Professor of Materials Science and Metallurgical Engineering at Ohio State in 1961. He was named to his present post as professor of Metallurgical Engineering in 1964.
own work. A stern taskmaster and disciplinarian, he was respected for his insistence on high standards of performance, not only in technical matters but also in written and oral presentation. The effectiveness of his tutelage is indicated by his many former students now successfully teaching at universities and performing research in industry or government laboratories. In addition he was interested in ,education in the broadest Awards include the Hardy Gold Medal, AIME, 1960; ASM Bradley Stoughton Award, 1964; Curtis McGraw Award of the ASEE, 1967; Fellow, ASM, 1971; Campbell Lecturer, ASM, 1972; Fellow, TMS-AIME, 1974. He was elected to the National Academy of Engineering in 1974. Dr. Hirth's committee activity includes service with the Committee on M
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