التفاصيل البيبلوغرافية
| العنوان: |
Favorable Impact Toughness of High Heat Input Coarse-Grained HAZ in an Ultra-Low Carbon High-Strength Microalloyed Steel. |
| المؤلفون: |
Yang, Yulong, Jia, Xiao, Ma, Yaxin, Wang, Ping, Zhu, Fuxian |
| المصدر: |
Metals & Materials International; Feb2023, Vol. 29 Issue 2, p485-500, 16p |
| مستخلص: |
An ultra-low carbon (0.035 wt%) high-strength steel plate was produced. The coarse-grained heat-affected Zone (CGHAZ) was simulated with different heat inputs of 25–200 kJ/cm. The low-temperature impact toughness and microstructure of CGHAZ were analyzed. The results indicated that the impact toughness of CGHAZ exhibited a favorable value at −20 °C under high heat input conditions. The Ti-containing complex inclusions stimulated the crack initiation and induced the nucleation of acicular microstructure. With the increase of heat inputs, the morphology of carbides or martensite–austenite (M–A) constituents changed from strip to block gradually, and the volume fraction decreased gradually, which increased the crack initiation absorbed energy. The coarse grain boundary ferrite (GBF) occupied by massive low-angle grain boundaries was not conducive to the crack propagation absorbed energy. In addition, the kinetic effective activation energy of GBF and acicular ferrite/granular bainite (AF/GB) were calculated to be ~175 kJ/mol and ~227 kJ/mol respectively, which revealed the kinetic reason for the preferential precipitation of GBF. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
