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  • INVESTIGATIONS OF THE FORMABILITY, WELDABILITY AND CREEP RESISTANCE OF SOME POTENTIAL LOW ACTIVATION AUSTENITIC STAINLESS STEELS FOR FUSION REACTOR APPLICATIONS

Abstract

The formability, weldability and creep properties have been investigated for three high-manganese high- nitrogen austenitic stainless steels proposed as low- activation materials for fusion. The alloys were found to possess adequate hot and cold workability, with marginally inferior stretch formability but slightly superior deep drawability relative to conventional austenitic steels. The weldability of the alloys, using TIG and MIG welding techniques, was satisfactory and no problems such as porosity or hot tearing of the weld metal, or liquation cracking in the heat affected zone, were encountered. In all cases tensile tests on the weldments gave fractures in the parent plate. In accelerated creep tests creep failure occurred by intergranular cracking, with creep rupture lives shorter than those of the comparable conventional steels. The shorter rupture lives may be attributable to an insufficiency of Ta(C,N) precipitation during creep exposure and would probably be improved by increasing the Ta:(C+N) ratio. It is generally concluded that, in respect of the properties so far examined, the low- activation alloys compare very favourably with the standard steels they were designed to replace.

Additional information

Authors: BOTT A H, DEPARTMENT OF METALLURGY, SHEFFIELD CITY POLYTECHNIC;CULHAM LABORATORY, ABINGDON (UK);PICKERING F B, DEPARTMENT OF METALLURGY, SHEFFIELD CITY POLYTECHNIC;CULHAM LABORATORY, ABINGDON (UK);BUTTERWORTH G J DEPARTMENT OF METALLURGY, SHEFFIELD CITY POLYTECHNIC, DEPARTMENT OF METALLURGY, SHEFFIELD CITY POLYTECHNIC;CULHAM LABORATORY, ABINGDON (UK);CULHAM LABORATORY, ABINGDON (UK), DEPARTMENT OF METALLURGY, SHEFFIELD CITY POLYTECHNIC;CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON OX14 3DB (UK), MENTIONING REPORT CLM-R274, 1986
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