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Microstructure Evolution and Mechanical Properties of Linear Friction Welded 45 Steel Joint
Author(s) -
Ma T. J.,
Li W.Y.,
Xu Q. Z.,
Zhang Y.,
Li J. L.,
Yang S. Q.,
Liao H. L.
Publication year - 2007
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200700090
Subject(s) - materials science , microstructure , welding , indentation hardness , ferrite (magnet) , pearlite , metallurgy , ductility (earth science) , joint (building) , martensite , ultimate tensile strength , composite material , welding joint , austenite , creep , structural engineering , engineering
Linear friction welding (LFW) is an emerging solid‐state joining process to extend the current applications of welding. The microstructure evolution and mechanical properties of LFW 45 steel joint were investigated. The microstructures from the weld center to the parent metal were the superfine ferrite+pearlite in the weld center, the deformed fine ferrite + pearlite in the thermomechanically affected zone, the tempered sorbite, troosite and martensite in the heat affected zone. The microhardness of the joint decreased gradually from the parent metal to the weld center. The tensile properties of the joint were significantly improved in both the strength and ductility. The microstructure evolution, microhardness variation and fracture position are attributed to the various thermal histories of different positions.