Study on Strengthening and Toughening Mechanism of Deposited Metal Form Welding Wire for 440 MPa Grade Uncoating Weathering Steel

doi:10.3901/JME.2025.08.159

Abstract

Abstract: The microstructure and mechanical properties of welding wire deposited metal for 440 MPa grade uncoating weathering steel were tested and characterized by using equipments such as optical microscope(OM), scanning electron microscope(SEM), transmission electron microscope(TEM), and X-ray diffraction(XRD), and the strengthening and toughening mechanism of the deposited metal was studied. The results show that the columnar crystal microstructure of the deposited metal are composed of proeutectoid ferrite, ferrite side paltes, acicular ferrite and a small amount of M-A constituent, and the weld beads is composed of quasi polygonal ferrite and a small amount of M-A constituent; The yield strength of the deposited metal is 482.5 MPa, the tensile strength is 565 MPa, the elongation after fracture is 30%, the reduction of area is 77.5%, and the impact absorption energy at -40 ℃ is 187.6 J, the strength and toughness match is excellent; Fine grain strengthening is the most important strengthening method for deposited metals, and solid solution strengthening and dislocation strengthening contribute less to strength, precipitation strengthening does not occur in the deposited metal; The acicular ferrite and quasi polygonal ferrite have strong resistance to crack growth, thus improving impact toughness, but proeutectoid ferrite, ferrite side paltes and M-A constituent have weak resistance to crack growth, and M-A constituent is prone to induce microcracks, thus reducing impact toughness. This study provides a reference for the development of welding materials for 440 MPa grade uncoating weather-resistant steel.

Key words: 440 MPa grade uncoating weathering steel, gas-shielded solid welding wire, deposited metal, microstructure, strengthening and toughening mechanism

CLC Number:

TG445

AN Tongbang, ZENG Daoping, LI Chengye, WU Zhanmin, MA Chengyong, PENG Yun. Study on Strengthening and Toughening Mechanism of Deposited Metal Form Welding Wire for 440 MPa Grade Uncoating Weathering Steel[J]. Journal of Mechanical Engineering, 2025, 61(8): 159-169.

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