Metallurgical study on low-temperature aging characteristics and SCC behavior of type 316l welds

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Two types of 316L SS weld metal with different solidification modes were prepared using two kinds of filler metals having tailored Ni equivalent and Cr equivalent. The changes in nanoscale microstructure of Δ-ferrite, in hardness, and in stress corrosion cracking (SCC) behaviors of the weld samples with isothermal aging at 335 °C have been investigated. The mottled aspect has been observed in Δ-ferrite of both the ferrite-austenite (FA) and austenite-ferrite (AF) solidification mode aged samples by transmission electron microscope (TEM) observation. This aspect might be attributed to spinodal decomposition into chromium-rich a' and iron-rich a. The hardness of ferrite phase has increased with aging time, while the hardness of austenite phase has stayed the same. This characteristic suggests that spinodal decomposition has occurred in Δ-ferrite. The age-hardening rate of Δ-ferrite was faster for AF mode sample than FA mode sample in the initial stage of the aging. It has been suggested that solidification mode can affect kinetics of spinodal decomposition. The number of cracks and the average crack depth of both solidification mode specimens have been slightly increased by the aging at 335 °C for 13200 hours.

Original languageEnglish
Title of host publication17th International Corrosion Congress 2008
Subtitle of host publicationCorrosion Control in the Service of Society
Pages2601-2609
Number of pages9
Publication statusPublished - 2008 Dec 1
Event17th International Corrosion Congress 2008: Corrosion Control in the Service of Society - Las Vegas, NV, United States
Duration: 2008 Oct 62008 Oct 10

Publication series

Name17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
Volume4

Other

Other17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
CountryUnited States
CityLas Vegas, NV
Period08/10/608/10/10

Keywords

  • Austenitic stainless steel
  • Solidification mode
  • Stress corrosion cracking
  • Thermal aging
  • Welds

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Surfaces, Coatings and Films

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  • Cite this

    Abe, H., & Watanabe, Y. (2008). Metallurgical study on low-temperature aging characteristics and SCC behavior of type 316l welds. In 17th International Corrosion Congress 2008: Corrosion Control in the Service of Society (pp. 2601-2609). (17th International Corrosion Congress 2008: Corrosion Control in the Service of Society; Vol. 4).