抄録
Effect of delta ferrite on low temperature toughness of molbdenum-bearing weld metal (Type 316L) was reported in authors’ previous papers, which revealed that notch toughness of as-welded metal was considerably dependent on a solidification mode and in addition, the amount of molybdenum within the delta ferrite which was strongly affected by the solidification mode was closely related to the weld toughness. In this study, a similar relation on molybdenum-free weld metal (Type 308L) was investigated in detail by using a transmission electron microscopy (TEM) and an analytical electron microscopy (STEM/EDX). From notch toughness test at 77K of as-welded metal, the toughness decreased monotonously and slightly with increasing amount of delta ferrite. This result differed from the previous data of Type 316L weld metal and revealed that toughness of Type 308L weld metal was basically unaffected by solidification mode. In eutectic delta ferrite, a loss of coherency between crystallographic orientation of delta ferrite and that of adjacent austenite matrix reduced as compared with previous data of Type 316L weld metal. Moreover, STEM/EDX analysis suggested that chromium content within eutectic delta ferrite was about 4 percent more than that within primary delta ferrite. This was considered to be due to difference of solidification mode. From above results, lack of molybdenum in the weld metal would increase coherency at eutectic delta ferrite/austenite interface. As a result, marked degradation of toughness in eutectic delta ferrite weld metal was considered to not occur.
| 元の言語 | English |
|---|---|
| ページ（範囲） | 511-515 |
| ページ数 | 5 |
| ジャーナル | Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society |
| 巻 | 5 |
| 発行部数 | 4 |
| DOI | |
| 出版物ステータス | Published - 1987 |
| 外部発表 | Yes |
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ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Surfaces, Coatings and Films
- Metals and Alloys
これを引用
Effect of Delta Ferrite on Low Temperature Toughness of Type 308 L Weld Metal —Low Temperature Toughness of Austenitic Stainless Steel Weld Metal (Report 4)—. / Onzawa, Tadao; Takasaki, Akito; Harada, Takashi; Tamura, Hiroshi.
：: Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society, 巻 5, 番号 4, 1987, p. 511-515.研究成果: Article
}
TY - JOUR
T1 - Effect of Delta Ferrite on Low Temperature Toughness of Type 308 L Weld Metal —Low Temperature Toughness of Austenitic Stainless Steel Weld Metal (Report 4)—
AU - Onzawa, Tadao
AU - Takasaki, Akito
AU - Harada, Takashi
AU - Tamura, Hiroshi
PY - 1987
Y1 - 1987
N2 - Effect of delta ferrite on low temperature toughness of molbdenum-bearing weld metal (Type 316L) was reported in authors’ previous papers, which revealed that notch toughness of as-welded metal was considerably dependent on a solidification mode and in addition, the amount of molybdenum within the delta ferrite which was strongly affected by the solidification mode was closely related to the weld toughness. In this study, a similar relation on molybdenum-free weld metal (Type 308L) was investigated in detail by using a transmission electron microscopy (TEM) and an analytical electron microscopy (STEM/EDX). From notch toughness test at 77K of as-welded metal, the toughness decreased monotonously and slightly with increasing amount of delta ferrite. This result differed from the previous data of Type 316L weld metal and revealed that toughness of Type 308L weld metal was basically unaffected by solidification mode. In eutectic delta ferrite, a loss of coherency between crystallographic orientation of delta ferrite and that of adjacent austenite matrix reduced as compared with previous data of Type 316L weld metal. Moreover, STEM/EDX analysis suggested that chromium content within eutectic delta ferrite was about 4 percent more than that within primary delta ferrite. This was considered to be due to difference of solidification mode. From above results, lack of molybdenum in the weld metal would increase coherency at eutectic delta ferrite/austenite interface. As a result, marked degradation of toughness in eutectic delta ferrite weld metal was considered to not occur.
AB - Effect of delta ferrite on low temperature toughness of molbdenum-bearing weld metal (Type 316L) was reported in authors’ previous papers, which revealed that notch toughness of as-welded metal was considerably dependent on a solidification mode and in addition, the amount of molybdenum within the delta ferrite which was strongly affected by the solidification mode was closely related to the weld toughness. In this study, a similar relation on molybdenum-free weld metal (Type 308L) was investigated in detail by using a transmission electron microscopy (TEM) and an analytical electron microscopy (STEM/EDX). From notch toughness test at 77K of as-welded metal, the toughness decreased monotonously and slightly with increasing amount of delta ferrite. This result differed from the previous data of Type 316L weld metal and revealed that toughness of Type 308L weld metal was basically unaffected by solidification mode. In eutectic delta ferrite, a loss of coherency between crystallographic orientation of delta ferrite and that of adjacent austenite matrix reduced as compared with previous data of Type 316L weld metal. Moreover, STEM/EDX analysis suggested that chromium content within eutectic delta ferrite was about 4 percent more than that within primary delta ferrite. This was considered to be due to difference of solidification mode. From above results, lack of molybdenum in the weld metal would increase coherency at eutectic delta ferrite/austenite interface. As a result, marked degradation of toughness in eutectic delta ferrite weld metal was considered to not occur.
KW - Analytical electron microscopy
KW - Austenitic stainless steel
KW - Delta ferrite
KW - Ferrite/austenite interface
KW - Low temperature toughness
KW - Solidification mode
KW - Transmission electron microscopy
KW - Weld metal
UR - http://www.scopus.com/inward/record.url?scp=85010090293&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85010090293&partnerID=8YFLogxK
U2 - 10.2207/qjjws.5.511
DO - 10.2207/qjjws.5.511
M3 - Article
AN - SCOPUS:85010090293
VL - 5
SP - 511
EP - 515
JO - Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
JF - Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
SN - 0288-4771
IS - 4
ER -