EFFECT OF delta FERRITE ON LOW TEMPERATURE TOUGHNESS OF TYPE 316L AUSTENITIC STAINLESS STEEL WELD METAL - LOW TEMPERATURE TOUGHNESS OF AUSTENITIC STAINLESS STEEL WELD METAL (REPORT 1).

被引:0
作者
Tamura, Hiroshi [1 ]
Onzawa, Tadao [1 ]
Takasaki, Akito [1 ]
Takatori, Tetsuya [1 ]
机构
[1] Tokyo Inst of Technology, Jpn, Tokyo Inst of Technology, Jpn
来源
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | 1986年 / 4卷 / 02期
关键词
IRON AND STEEL METALLOGRAPHY - Ferrite - METALLOGRAPHY - Austenite - STEEL - Fracture - THERMAL EFFECTS;
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摘要
In notch toughness test of as-welded specimens at 77 and 103 K, there was no simple correlation between the notch toughness and delta -ferrite content, differing from the results of other previous studies relative to this research. In more than about 3% delta -ferrite, the notch toughness increases with delta -ferrite content and reaches a maximum values at about 7% delta -ferrite. The solidification structure indicated that in the 3% delta -ferrite specimen of minimum notch toughness, an eutectic delta -ferrite appeared and furthermore with increasing delta -ferrite content, the morphology alters to vermicular and then lathy ferrite. In heat treating the specimens at 923 K for 100 h, the absorbed energy decreased dramatically with increasing prior delta -ferrite content. This was considered because delta -ferrite changed to sigma phase and carbide by heat treating.
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页码:353 / 359
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