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

研究成果: Article査読

2 被引用数 (Scopus)

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.

本文言語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
5
4
DOI
出版ステータスPublished - 1987
外部発表はい

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 表面、皮膜および薄膜
  • 金属および合金

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