期刊
JOURNAL OF MANUFACTURING PROCESSES
卷 60, 期 -, 页码 520-529出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2020.10.082
关键词
Coarse grain heat-affected zone; t(8/5); Computational welding simulation
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (Capes)
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (Faperj)
This work aimed to develop a microstructure-predicting methodology (MPM) using coupled physical-FEMthermodynamic simulation to predict the influence of cooling time from 800 to 500 degrees C (t(8/5) - 15, 30, 80, and 210 s) on the microstructure and mechanical behavior of the coarse grain heat-affected zone (CGHAZ) of a Cr-Mo low alloy steel welded joint. The MPM was experimentally validated. The MPM certainly predicted that the increase of t(8/5) caused a remarkable change in CGHAZ microstructure (martensite and bainite to ferrite with aligned and non-aligned martensite-austenite-carbide M-A-C) and also decreases the Vickers microhardness. The MPM and experimental data show that the use of welding parameters that increases t(8/5) (reducing the cooling rate) can jeopardize the welded joint behavior. Besides, the MPM proved to be a suitable tool for estimating the microstructure and microhardness of the CGHAZ.
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