Relationship between microstructure and mechanical properties of V-N microalloyed high strength ship plate steel

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Express Pub Date : 2024-08-06 DOI:10.1088/2053-1591/ad5c2e

Boyong Li, Guanglong Li, Dazheng Zhang, Ling Yan, Peng Zhang, Pengcheng Liu, Jiuhan Xiao, Xiangyu Qi, Xiaohang Wang and Jinyi Liu

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Abstract

V-N microalloying treatment is an important way to improve the service performance of non-quenched and tempered ship plate steel. Herein, the influence of V(C, N) on the evolution of microstructure and improvement of mechanical properties was studied. In addition, the relationship between microstructure and mechanical properties of V-N microalloyed high strength ship plate steel was revealed. The results showed that the composite addition of V and N not only formed a fine dispersed precipitated phase, but more importantly, significantly refined the ferrite/pearlite microstructure, promoted the formation of intragranular acicular ferrite, increased the proportion of high angle grain boundaries, and decreased the kernel average misorientation value. The optimization of microstructure brought about by V-N microalloying achieved synchronous improvement of strength and cryogenic toughness. The impact energy of V-N microalloying ship plate steel increased from 97 J of V-N-free ship plate steel to 239 J at −40 °C, and the impact fracture mode changed from brittle quasi-cleavage fracture to microvoid coalescence fracture with a large number of equiaxial dimples.

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V-N 微合金化高强度船板钢的微观结构与力学性能之间的关系

V-N 微合金化处理是提高非调质船板钢使用性能的重要方法。本文研究了 V（C，N）对微观组织演变和力学性能改善的影响。此外，还揭示了 V-N 微合金化高强度船板钢微观组织与力学性能之间的关系。结果表明，V 和 N 的复合添加不仅形成了细小分散的析出相，更重要的是显著细化了铁素体/珠光体的微观组织，促进了晶内针状铁素体的形成，增加了高角度晶界的比例，降低了晶核平均错位值。V-N 微合金化带来的微观结构优化实现了强度和低温韧性的同步提高。V-N 微合金化船板钢的冲击能从无 V-N 船板钢的 97 J 提高到了 -40 °C 时的 239 J，冲击断裂模式也从脆性准劈裂断裂转变为具有大量等轴窝的微空凝聚断裂。

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来源期刊

Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

4.30%

发文量

640

审稿时长

12 weeks

期刊介绍： A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.