期刊
MATERIALS
卷 15, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/ma15103588
关键词
CGHAZ; thermal cycle; impact toughness; niobium microalloying
类别
资金
- NSFC [U20A20279, 50734004]
- 111 project [18018]
The effect of different heat inputs on the microstructure and impact toughness of the simulated coarse-grained heat-affected zone (CGHAS) of a niobium microalloyed low-carbon steel was investigated. It was found that a low heat input resulted in the formation of acicular ferrite laths/plates and improved impact toughness. On the other hand, a high heat input led to the predominance of granular bainite and massive MA constituents, impairing the impact toughness.
The effect of various heat inputs on the microstructure and impact toughness of the simulated coarse-grained heat-affected zone (CGHAS) of a niobium microalloyed (0.14 wt.%) low-carbon steel was studied. The results showed that higher impact toughness was achieved at a low heat input of 20 kJ/cm, which resulted from the formation of acicular ferrite laths/plates. They sectioned large prior austenite grains into many smaller regions, resulting in smaller crystallographic grains and high-angle grain boundaries. Conversely, when specimens were simulated with larger heat-inputs (100, 200 kJ/cm), the microstructure of the CGHAZ was predominantly composed of granular bainite plus massive MA constituents, thus impairing the impact toughness.
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