层状化工艺对船用10Ni5CrMoV钢微观结构和力学性能的影响

邹涛; 董艳伍; 姜周华; 杜书扬; 李毓硕

doi:10.1007/s12613-024-2897-5

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 一校

Tao Zou, Yanwu Dong, Zhouhua Jiang, Shuyang Du, and Yushuo Li, Effect of lamellarization on the microstructure and mechanical properties of marine 10Ni5CrMoV steel, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2897-5

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Tao Zou, Yanwu Dong, Zhouhua Jiang, Shuyang Du, and Yushuo Li, Effect of lamellarization on the microstructure and mechanical properties of marine 10Ni5CrMoV steel, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2897-5

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研究论文

层状化工艺对船用10Ni5CrMoV钢微观结构和力学性能的影响

1)
东北大学冶金学院, 沈阳 110819, 中国
2)
东北大学轧制技术及连轧自动化国家重点实验室, 沈阳 110819, 中国
3)
东北大学多金属矿生态冶金教育部重点实验室, 沈阳 110819, 中国

通讯作者:
董艳伍 E-mail: dongyw@smm.neu.edu.cn

文章亮点

(1) 系统分析了淬火–层状化–回火工艺对10Ni5CrMoV钢应变硬化行为和低温增韧机制。

(2) 阐明了逆转奥氏体的演变机制和生长动力学过程。

(3) 总结并提出了获得最佳强韧性匹配的层状化温度。

中文摘要

使用淬火（Q）–层状化（L）–回火（T）的多级热处理工艺制备了船用10Ni5CrMoV钢，通过多尺度表征手段研究了其微观结构和力学性能演变规律，重点研究了逆转奥氏体的转变动力学、应变硬化行为和低温增韧机理。层状化过程会在马氏体板条和块界处生成膜状的逆转奥氏体，这会细化马氏体组织，降低试样的等效晶粒尺寸。使用基于JMAK模型对逆转奥氏体的生长动力学分析表明，等温转变过程是以逆转奥氏体的生长为主，并且存在一个峰值温度（750°C）使得逆转奥氏体的转变量达到最大。使用基于改进的Crussard–Jaoul方法分析的不同层状化工艺所得试样的应变硬化行为表明，层状化过程所生成的逆转奥氏体会降低基体中马氏体的比例，显著降低变形过程中阻碍裂纹扩展的能力，因此试样会表现出较高的机械加工性能。与QT试样相比，QLT试样拥有较低的等效晶粒尺寸和逆转奥氏体的存在，这会增加裂纹扩展所需的解理应力，同时消耗外加载荷的能量，进而导致韧脆转变温度从−116°C降低到−130°C，低温韧性显著提升。本工作为提升船用10Ni5CrMoV钢的低温韧性提供了思路，为其工业应用和综合性能的提高奠定了理论基础。

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Research Article

Effect of lamellarization on the microstructure and mechanical properties of marine 10Ni5CrMoV steel

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Abstract

Abstract

Multistage heat treatment involving quenching (Q), lamellarizing (L), and tempering (T) is applied to marine 10Ni5CrMoV steel. The microstructure and mechanical properties were studied by multiscale characterizations, and the kinetics of reverse austenite transformation, strain hardening behavior, and toughening mechanism were further investigated. The lamellarized specimens possess low yield strength but high toughness, especially cryogenic toughness. Lamellarization leads to the development of film-like reversed austenite at the martensite block and lath boundaries, refining the martensite structure and lowering the equivalent grain size. Kinetic analysis of austenite reversion based on the JMAK model shows that the isothermal transformation is dominated by the growth of reversed austenite, and the maximum transformation of reversed austenite is reached at the peak temperature (750°C). The strain hardening behavior based on the modified Crussard–Jaoul analysis indicates that the reversed austenite obtained from lamellarization reduces the proportion of martensite, significantly hindering crack propagation via martensitic transformation during the deformation. As a consequence, the QLT specimens exhibit high machinability and low yield strength. Compared with the QT specimen, the ductile–brittle transition temperature of the QLT specimens decreases from −116 to −130°C due to the low equivalent grain size and reversed austenite, which increases the cleavage force required for crack propagation and absorbs the energy of external load, respectively. This work provides an idea to improve the cryogenic toughness of marine 10Ni5CrMoV steel and lays a theoretical foundation for its industrial application and comprehensive performance improvement.
- 10Ni5CrMoV steel;
- lamellarizing;
- reversed austenite;
- cryogenic toughness;
- ductile–brittle transition temperature

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