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)—

Tadao Onzawa, Akito Takasaki, Takashi Harada, Hiroshi Tamura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)511-515
Number of pages5
JournalYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
Volume5
Issue number4
DOIs
Publication statusPublished - 1987
Externally publishedYes

Fingerprint

Austenitic stainless steel
Toughness
Ferrite
Welds
Metals
Eutectics
Molybdenum
Solidification
Temperature
Austenite
Energy dispersive spectroscopy
Bearings (structural)
Chromium
Electron microscopy
Transmission electron microscopy
Degradation

Keywords

  • Analytical electron microscopy
  • Austenitic stainless steel
  • Delta ferrite
  • Ferrite/austenite interface
  • Low temperature toughness
  • Solidification mode
  • Transmission electron microscopy
  • Weld metal

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

Cite this

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title = "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)—",
abstract = "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.",
keywords = "Analytical electron microscopy, Austenitic stainless steel, Delta ferrite, Ferrite/austenite interface, Low temperature toughness, Solidification mode, Transmission electron microscopy, Weld metal",
author = "Tadao Onzawa and Akito Takasaki and Takashi Harada and Hiroshi Tamura",
year = "1987",
doi = "10.2207/qjjws.5.511",
language = "English",
volume = "5",
pages = "511--515",
journal = "Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society",
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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

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