Advanced Materials for Severe Service Applications by K. Iida (auth.), K. Iida, A. J. McEvily (eds.)

By K. Iida (auth.), K. Iida, A. J. McEvily (eds.)

The fabric lined within the manuscripts released herein was once subjected to public inquiry through the Japan-US Joint Seminar on fabrics for critical provider stipulations in the course of 19-23 may perhaps 1986 on the Toranomon Pastral visitor condo in Minato-Ku, Tokyo, Japan. This seminar was once the most recent in a sequence on complex fabrics and purposes initiated within the early Seventies by way of Professor T. Kanazawa of Japan and Professor A. S. Kobayashi of the USA. The 1986 seminar was once equipped via the undersigned with the capable tips of Professor H. Kobayashi and Dr H. Nakamura of the Tokyo Institute of know-how, and Dr ok. Minakawa of the Nippon Kokan Technical learn middle. The semi­ nar was once backed through the united states nationwide technology origin and by means of the Japan Society for advertising of technology. This court cases quantity is obtainable for its. reference worth within the enhancement of the knowledge of the habit of complex struc­ tural fabrics for layout functions related to hostile loading con­ ditions and serious environments. in the course of the seminar makes an attempt have been additionally made to extract precedence problems with attainable wide effect on technological know-how or expertise, and to articulate attainable instructions for motion plans.

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Narrow gap welding (NGW) is gradually being applied in the conventional arc welding field. In the following, the author will briefly mention some unresolved welding problems encountered during and after welding. (1) Hot cracking: hot cracking is divided into two categories of supersolidus and subsolidus cracking. Note that here the solidus means the real solidus under which no liquid exists between dendrites. These crackings are classified as, Hot cracking { Supersolidus crack: { Solidification crack (in weld metal) (caused by low Liquation crack (in HAZ and/or weld metal) melting liquid film) Subsolidus crack: Ductility-dip crack (in weld metal and or HAZ) (caused by precipitation and/or sliding of grain boundaries) Ductility changes during and after solidification are illustrated in Fig.

2. Typical examples of hot crack experienced. the welded joints of some metals and alloys are heat-treated in a furnace after fabrication. Reheat cracking may occur in the weldments of Cr-Mo steels, some austenitic stainless steels and heat resistant nickel alloys after heat treatment. In order to prevent reheat cracking improved purity of material, joint configuration and heat treatment are used for special metals and alloys. (4) Porosities: porosities are very often seen in weld metal of some materials.

I soIid2S) (Bulk solidus) . r 1 Ing Gr .. B. B. Migr lion ~. B . l1 iul ion} FIG. 1. Ductility curve and hot cracking susceptibility during cooling after welding. DeWU~ ~ PMr-l1k. C. C . ROOI C. bNdC. Nieto fflsur. c~t~. Pr. lINd HAZ C. Hoflzon.. C. L'-1lonC. FIG. 2. Typical examples of hot crack experienced. the welded joints of some metals and alloys are heat-treated in a furnace after fabrication. Reheat cracking may occur in the weldments of Cr-Mo steels, some austenitic stainless steels and heat resistant nickel alloys after heat treatment.

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