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The effect of aging on the intergranular corrosion of a 24Cr‐14Ni‐0.7Si stainless steel for welding in architecture
Author(s) -
Lin DongYih,
Wu Weite,
Lin Chang Herng
Publication year - 2001
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.200100117
Subject(s) - intergranular corrosion , metallurgy , materials science , corrosion , welding , phase (matter) , liquid phase , chemistry , physics , organic chemistry , thermodynamics
Stainless steel with high Cr (24 %) and Ni (14 %) contents is becoming more important for use as core material for welding wires and in burning ovens due to its excellent corrosion resistance. This 24Cr‐14Ni material, with a Cr enriched σ‐phase, can be formed in a temperature range between 600 ‐ 950°C. In contrast, the remaining matrix phase can be induced into a Cr‐depletion after the σ‐phase formation. This research studied the intergranular corrosion rate under aging temperatures that are similar to the service parameters of this material in burning ovens. The study provided evidence that the relationship between the aging time and corrosion rate is not linear. A series of metallographic studies was performed to survey this phenomenon.