EFFECT OF DELTA FERRITE ON LOW TEMPERATURE TOUGHNESS OF TYPE 308L WELD METAL.

Tadao Onzawa, Akito Takasaki, Takashi Harada, Hiroshi Tamura

研究成果: Article

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In this study, a relation on molybdenum-free weld metal (Type 308L) was investigated in detail by using 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.

元の言語English
ページ(範囲)81-85
ページ数5
ジャーナルYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
5
発行部数4
出版物ステータスPublished - 1987 11 1

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ASJC Scopus subject areas

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

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