Cold cracking, microstructure, notch toughness, transverse and longitudinal hardness to the weld joint of P460NL1 steel [Fisuracion en frio, microestructura, tenacidad a la entalla, dureza transversal y longitudinal a la union de soldadura del acero P460NL1]

Authors

  • Hebert Gustavo Vizconde Poémape Escuela de Ingeniería de Materiales, Universidad Nacional de Trujillo
  • Osmar F. Armas Escuela de Ingeniería de Materiales, Universidad Nacional de Trujillo
  • joel A. Briceño Escuela de Ingeniería de Materiales, Universidad Nacional de Trujillo
  • Nilthon E. Zavaleta Escuela de Ingeniería Metalúrgica, Universidad Nacional de Trujillo
  • Norberto Damian Ñique Escuela de Ingeniería de Materiales, Universidad Nacional de Trujillo

Keywords:

Cold cracking; Transverse-longitudinal hardness, Microstructure, Steel P460NL1.

Abstract

Microstructural development, longitudinal HV10 hardness as transversal to the fusion zone and notch toughness in root and filling pass were evaluated at preheating temperatures of 100 °C, 140 °C, 180 °C, 220 °C and 260 °C in the weld joint of P460NL1 steel, by FCAW in root pass and for filling-finishing by means of the SAW process, the control of the start and interpass preheating temperatures was carried out by thermal blankets and digital pyrometer. The NDT of magnetic particles justify the acceptance or rejection of the specimens for the study. In selected points of the weld joint they showed the dependence of the hardness as a function of the microstructure. At room temperature, immediate cold cracking was observed. In the HAZ, the microconstituents generated areas of high hardness under the cord and areas of low hardness due to overturning, with the presence of Windmastatten ferrite, the increase in preheating determined the decrease and sometimes the absence of hardened structures. The profiles determined a decrease in hardness as the preheating temperature increased. Columnar grains with a high presence of WF ferrite in their different morphologies and FP (C) and refined areas with typical microconstituents were observed in the Fusion Zone. Homogeneity was evidenced with respect to notch toughness at all temperatures and the effect of passes on the longitudinal microstructure, which shows the benefit of the preheating temperature by reducing the hardness in critical areas and homogenizing the welded joint.

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Published

22-01-2021

How to Cite

Vizconde Poémape, H. G. ., Armas, O. F. ., Briceño, joel A., Zavaleta, N. E. ., & Ñique , N. D. . (2021). Cold cracking, microstructure, notch toughness, transverse and longitudinal hardness to the weld joint of P460NL1 steel [Fisuracion en frio, microestructura, tenacidad a la entalla, dureza transversal y longitudinal a la union de soldadura del acero P460NL1]. Journal of Sciences and Engineering, 5(1), 16–28. Retrieved from https://www.journals.cincader.org/index.php/sej/article/view/67