Modelling of Strains During SAW Surfacing Taking into Heat of the Weld in Temperature Field Description and Phase Transformations

International Conference on Materials, Alloys and Experimental Mechanics 2017

材料科学;金属学;机械制造

Winczek, J.^1 ; Makles, K.^1 ; Gucwa, M.^1 ; Gnatowska, R.^1 ; Hatala, M.^2

Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Czestochowa

42-201, Poland^1

Faculty of Manufacturing Technologies, Technical University of Kosice with a seat in Preov, Preov

080 01, Slovakia^2

关键词: Diffusive transformation;    Direct impact;    Kinetics of phase transformation;    Semi-infinite body model;    Steel elements;    Structural strain;    Temperature values;    Volumetric modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/225/1/012038/pdf
DOI  :  10.1088/1757-899X/225/1/012038

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In the paper, the model of the thermal and structural strain calculation in a steel element during single-pass SAW surfacing is presented. The temperature field is described analytically assuming a bimodal volumetric model of heat source and a semi-infinite body model of the surfaced (rebuilt) workpiece.The electric arc is treated physically as one heat source. Part of the heat is transferred by the direct impact of the electric arc, while another part of the heat is transferred to the weld by the melted material of the electrode. Kinetics of phase transformations during heating is limited by temperature values at the beginning and at the end of austenitic transformation, while the progress of phase transformations during cooling is determined on the basis of TTT-welding diagramand JMA-K law for diffusive transformations, and K-M law for martensitic transformation. Totalstrains equal to the sum ofthermaland structuralstrainsinduced by phasetransformationsin weldingcycle.