Study on the Cracking Mechanism of YQ450NQR1 High-Strength Weathering Steel

YQ450NQR1 high-strength weathering steel is prone to cracking. The cracking patterns and morphology were detected by metallographic and scanning electron microscopies. The decarburized layer around the cracks is indicative of their origination in the continuous casting bloom. Then, the controlling f...

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Bibliographic Details
Published inStrength of materials Vol. 50; no. 1; pp. 176 - 183
Main Authors Qing, J. S., Duan, X. D., Xiao, M. F., Li, J. Q., Liu, M., Liu, Q., Shen, H. F.
Format Journal Article
LanguageEnglish
Published New York Springer US 2018
Springer
Springer Nature B.V
Subjects
Analysis
Atmospheric corrosion
Carbon content
Casting (Metal)
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Continuous casting
Corrosion resistant steels
Decarburizing
High strength
Materials Science
Solid Mechanics
Steel industry
Structural steels
Water flow
Weathering steels
high-strength weathering steel
decarburization layer
cracking
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Summary:YQ450NQR1 high-strength weathering steel is prone to cracking. The cracking patterns and morphology were detected by metallographic and scanning electron microscopies. The decarburized layer around the cracks is indicative of their origination in the continuous casting bloom. Then, the controlling factors were established by analyzing the carbon content of molten steel, residual elements in the alloy, purity and performance of the mold powder, and secondary cooling water flow of the mold. Results show that the process optimization reduced the cracking reject ratio from 3.5 to 0.78%.
ISSN:0039-2316
1573-9325
DOI:10.1007/s11223-018-9957-x