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

Tadao Onzawa, Akito Takasaki, Takashi Harada, Hiroshi Tamura

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)81-85
Number of pages5
JournalYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
Volume5
Issue number4
Publication statusPublished - 1987 Nov
Externally publishedYes

Fingerprint

Toughness
Ferrite
Welds
Metals
Eutectics
Solidification
Energy dispersive spectroscopy
Temperature
Molybdenum
Chromium
Austenite
Electron microscopy
Transmission electron microscopy

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

EFFECT OF DELTA FERRITE ON LOW TEMPERATURE TOUGHNESS OF TYPE 308L WELD METAL. / Onzawa, Tadao; Takasaki, Akito; Harada, Takashi; Tamura, Hiroshi.

In: Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society, Vol. 5, No. 4, 11.1987, p. 81-85.

Research output: Contribution to journalArticle

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