Dissimilar Dual Phase-Low Carbon Steel Joints by the GMAW Process Subjected to Impact Load

Metals

César M. Gómora¹  Ricardo R. Ambriz¹  Christian J. García¹  David Jaramillo¹  Ismael Ruíz-López² 

[1] Instituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, Mexico;Pintura Estampado y Montaje S.A.P.I. de C.V. Avenida Concepción Beístegui 2007 Col. Zona Industrial Poniente, Celaya 38020, Guanajuato, Mexico;

关键词: dissimilar welding;    GMAW process;    impact test;    dual phase steels;    low carbon steels;   

DOI  :  10.3390/met12030404

来源: DOAJ

【 摘 要 】

Dissimilar welding used in the automotive area are possible joints with the GMAW process; however, its structural performance must be evaluated. The focus of this work is to study the microstructural–mechanical properties of dissimilar welding DPC340Y590T dual phase–JSC270C low carbon steels. Microhardness profile, tensile, and impact tests were used to evaluate the mechanical behavior, while optical and scanning electron microscopy were employed to evaluate the microstructural changes. The tensile strength was 540 and 275 MPa in dual phase and low carbon, respectively. Weld thermal cycles were obtained by means of K type thermocouples. The welding heat input generated martensite and grain growth in the dual phase heat affect zone, while grain growth and perlite phase increased in the low carbon heat affected zone. The variation in microhardness profile was produced by the presence of different phases, and the temperature at the end of dual phase heat affect zone was approximately 242 °C. During impact tests, the absorbed energies were 19.3, 50.7, and 50.2 J for low carbon, dual phase steel, and the welded dissimilar joint respectively. Finally, dissimilar welding subjected to tensile test failed in the low carbon steel (270 MPa), out of the heat affect zone, thus a good dissimilar joint between both steels was obtained.

【 授权许可】

Unknown