The material covered in the manuscripts published herein was subjected to public inquiry during the Japan-US Joint Seminar on Materials for Severe Service Conditions during 19-23 May 1986 at the Toranomon Pastral Guest House in Minato-Ku, Tokyo, Japan. This seminar was the latest in a series on advanced materials and applications initiated in the early 1970s by Professor T. Kanazawa of Japan and Professor A. S. Kobayashi of the United States. The 1986 seminar was organized by the undersigned with the able assistance of Professor H. Kobayashi and Dr H. Nakamura of the Tokyo Institute of Technology, and Dr K. Minakawa of the Nippon Kokan Technical Research Center. The semi nar was sponsored by the US National Science Foundation and by the Japan Society for Promotion of Science. This Proceedings volume is offered for its. reference value in the enhancement of the understanding of the behavior of advanced struc tural materials for design applications involving adverse loading con ditions and severe environments. During the seminar attempts were also made to extract priority issues of possible broad impact on science or technology, and to articulate possible guidelines for action plans.

Superalloys, Supercomposites and Superceramics reviews the state of superalloy technology and some of the more salient aspects of alternative high temperature systems such as superceramics and supercomposites. Superalloy topics range from resource availability to advanced processing such as VIM, VAR, and VADAR, along with investment casting and single crystal growth, new superplastic forming techniques and powder metallurgy, structure property relationships, strengthening mechanisms, oxidation, hydrogen embrittlement, and phase predictions. This book is comprised of 22 chapters that explore key issues of high temperature materials in a synergistic manner. The first chapter reflects on the growth of the superalloy industry and its technology over the past 40 years. The discussion then turns to some of the trends in superalloy development, focusing on what is understood to be meant by the term strategic materials and the current status of resources and reserves in the United States. Particular attention is given to the supply sources and availability of strategic materials. The results achieved from the research program undertaken by NASA Lewis Research Center named Conservation Of Strategic Aerospace Materials (COSAM) are also presented. The chapters that follow explore alternative high temperature systems such as intermetallics, fiber reinforced superalloys, and the processing and high temperature properties of ceramics and carbon-carbon composites. This book will be a valuable resource for professionals and graduate students interested in learning about superalloys, supercomposites, and superceramics.

Engineering structures for reliable function and safety have to be designed such that operational mechanical loads are compensated for by stresses in the components bearable by the materials used. Vhat is "bearable"? First of all it depends on the properties of the chosen materials as well as on several other parameters, e.g. temperature, corrosivity of the environment, elapsed or remaining serviceable life, unexpected deterioration of materials, whatever the source and nature of such deterioration may be: defects, loss of strength, embrittlement, wastage, etc. DEFECTS and PROPERTIES of materials currently determine loadability. Therefore in addition to nondestructive testing for defects there is also a need for nondestructive testing of properties. The third type of information to be supplied by nondestructive measurement pertains to STRESS STATES under OPERATIONAL LOADS, i.e. LOAD-INDUCED plus RESIDUAL STRESSES. Residual stresses normally cannot be calculated; they have to be measured nondestructively; well-approved elastomechanical finite element codes are available and used for calculating load-induced stresses; for redundancy and reliability, engineers, however, need procedures and instrumentation for experimental checks.