Microstructure characterization in the weld metals of HQ130 + QJ63 high strength steels |
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Authors: | Juan Wang Yajiang Li |
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Affiliation: | (1) Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, 250061 Jinan, P.R. China |
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Abstract: | Microstructural characterization of the weld metals of HQ130 + QJ63 high strength steels, welded under 80% Ar + 20% CO2 gas shielded metal arc welding and different weld heat inputs, was carried out by means of scanning electron microscopy (SEM)
and transmission electron microscopy (TEM). The relative contents of acicular ferrite (AF) and pro-eutectic ferrites (PF)
in the weld metals were evaluated by means of XQF-2000 micro-image analyser. The experimental results indicate that there
is acicular ferrite in the grain and some pro-eutectic ferrite on the boundary of original austenite grains when the weld
heat input is small (E = 9.6 kJ/cm), but the main microstructure is ferrite side plate (FSP) when the heat input is larger (E = 22.3 kJ/cm). So the weld heat input should be strictly controlled in the range 10 ∼ 20 kJ/cm and then the content of pro-eutectic
ferrite is limited to < 25%. Thus weld metals of HQ130 + QJ63 high strength steels with high toughness and excellent resistance
to cracking can be ensured. |
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Keywords: | Microstructure characterization high strength steel weld metals |
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