Strength of 316FR Joints Welded by Type 316FR/16-8-2 Filler Metals
| Autor: | Kenji Yamamoto, Yuji Nagae, Takuya Yamashita, Kenichiro Satoh |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Filler metal 020209 energy Mechanical Engineering Gas tungsten arc welding Weldability Metallurgy Shielded metal arc welding 02 engineering and technology Welding 01 natural sciences 010305 fluids & plasmas Flash welding law.invention Creep Mechanics of Materials law 0103 physical sciences Ultimate tensile strength 0202 electrical engineering electronic engineering information engineering Composite material Safety Risk Reliability and Quality |
| Zdroj: | Journal of Pressure Vessel Technology. 138 |
| ISSN: | 1528-8978 0094-9930 |
| DOI: | 10.1115/1.4031444 |
| Popis: | Type 316 stainless steel with low-carbon and medium-nitrogen contents called 316FR stainless steel is a candidate structural material for reactor vessels and internals of future-generation fast breeder reactors (FBRs). The reactor vessel cannot be manufactured from rolled or forged steel, but can be built at reasonable cost by welding rolled steel plates. In this manufacture approach, the reliability of the welded joint must be indicated. Two types of filler metals are candidates for 316FR welded joints: types 316FR and 16-8-2 filler metals. The chemical composition of type 316FR filler metal is close to that of the stainless steel; type 16-8-2 filler metal contains lower amounts of Ni, Cr, and Mo than that of the stainless steel. This study evaluated the need to consider the welded joint strength reduction factors in 316FR welded joints under design of future-generation FBRs. To this end, the tensile and creep strengths of types 316FR and 16-8-2 weld metals were measured, and the effect of δ-ferrite in weld metals was evaluated in creep strength tests of 316FR welded joints. In tensile and creep strengths of 316FR welded joints welded by both metal types, the welded joint strength reduction factors were immaterial. The creep strength of 316FR welded joints was negligibly affected by δ-ferrite levels from 4.1 to 7.0 ferrite number (FN) in the Welding Research Council-1992 diagram. Furthermore, the tensile and creep strengths of 316FR welded joints by two methods (gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW)) were the same. Therefore, the tensile and creep strengths of 316FR welded joints in above condition are ensured the reliability of similar to 316FR stainless steels. |
| Databáze: | OpenAIRE |
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