Abstract：The mechanical properties and microstructure of large thickness marine steel FH790 at different thickness positions after single quenching and tempering heat treatment were studied and analyzed by advanced methods, including mechanical testing equipment, optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that the yield strength and tensile strength at different thickness positions of large thickness marine steel FH790 after only single quenching and tempering heat treatment had little difference, which could meet the classification society rules. However, the average impact energy at the 1/4 thickness (T/4) position was 58 J, and the average impact energy at the 1/2 thickness (T/2) core position was 26 J, which could hardly meet the classification society rules. The main reason was that there was a large amount of tempered granular bainite structures in the core of marine steel FH790 with a thickness of T/2. And the effective grain size of this microstructure was relatively large, which resulted in relatively poor impact toughness of the steel plate.
赵喜伟, 龙杰, 庞辉勇, 王九清. 单次淬火对大厚度FH790海工钢微观组织和性能的影响[J]. 冶金分析, 2024, 44(8): 34-40.
ZHAO Xiwei, LONG Jie, PANG Huiyong, WANG Jiuqing. Effect of single quenching on the microstructure and properties of large thickness marine steel FH790. , 2024, 44(8): 34-40.
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