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Metallographic examination of the heat‐affected zone of a test weld in a type X 20 CrMoV 12 1 steel
Author(s) -
Kussmaul Karl,
Gaudig Wolfgang,
Haas Siegfried
Publication year - 1991
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199101255
Subject(s) - tempering , base metal , martensite , materials science , metallurgy , welding , carbide , microstructure , ferrite (magnet) , heat affected zone , indentation hardness , composite material
Metallographic examination of a similar test weld in a type X 20 CrMoV 12 1 steel revealed a martensitic phase within the heat‐affected zone of the base metal adjacent to the fusion boundary. As a consequence, the heat‐affected zone displayed an excess microhardness compared with the unaffected base metal. It is shown that the occurrence of this martensitic phase can be correlated with segregations in the base metal. Due to its martensitic nature, this phase can be transformed to α‐ferrite and carbide by an additional tempering treatment subsequent to the standard post‐weld heat treatment. By this additional tempering treatment the uniformity of the microstructure of the heat‐affected zone can be considerably improved.