揭示应变诱导析出对钛钼微合金钢中持续冷却铁素体转变的影响

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-16 DOI:10.1016/j.jmrt.2024.09.130
Qifan Zhang , Liejun Li , Jixiang Gao , Zhuoran Li , Songjun Chen , Zhengwu Peng , Xiangdong Huo
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引用次数: 0

摘要

应变诱导析出是微合金钢生产热轧过程中的一种特征性物理冶金现象,对整个热机械控制过程有很大影响。本研究基于应力松弛和多视角表征方法,全面研究了钛钼微合金钢中的应变诱导析出行为,首次分析了应变诱导析出对连续冷却过程中奥氏体/铁素体转变的复杂影响。应力松弛结果表明,应变诱导的最快析出发生在 900 ℃。析出物被鉴定为 FCC 结构的 (Ti、Mo)C 颗粒,与奥氏体基体具有一致或半一致的立方-立方取向关系。事实证明,应变诱导沉淀提高了铁素体的转变温度和比例,显著细化和均匀化了转变晶粒。0.5 C/s的间歇淬火进一步表明,与奥氏体基体具有立方立方取向关系的(Ti、Mo)C颗粒发挥了双重夹持效应:通过夹持位错,这些颗粒促进了扩散控制的铁素体在奥氏体晶界和晶粒内部的成核和生长;通过夹持迁移相界面,这些颗粒抑制了铁素体晶粒的粗化。结合抗压试验和强化贡献分析,应变诱导沉淀被证明会削弱沉淀强化,但会增强晶粒细化强化,从而为实现微观结构均匀性和机械性能之间的最佳平衡提供了一种新方法。
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Unraveling the effects of strain‒induced precipitation on continuous cooling ferrite transformation in titanium‒molybdenum microalloyed steel

Strain‒induced precipitation is a characteristic physical‒metallurgical phenomenon during hot‒rolling in microalloyed steel production that strongly affects the overallthermomechanical control process. In this study, the strain‒induced precipitation behavior in titanium‒molybdenum microalloyed steel was comprehensively investigated, and its complex effects on the austenite/ferrite transformation during continuous cooling were analyzed for the first time, based on stress relaxation and multi‒aspect characterization methods. The stress relaxation results revealed that the fastest strain‒induced precipitation occurred at 900 °C. The precipitates were identified as FCC structured (Ti, Mo)C particles with a coherent or semi‒coherent cubic‒cubic orientation relationship to the austenite matrix. The strain‒induced precipitation proved to increase the ferrite transformation temperature and proportion, significantly refine and homogenize the transformed grains. The intermittent quenching at 0.5 C/s further revealed that the (Ti, Mo)C particles with cubic‒cubic orientation relationship to austenite matrix exerted a dual pinning effect: by pinning dislocations, these particles facilitated diffusion‒controlled ferrite nucleation and growth both at austenite grain boundaries and within grains; by pinning migrating phase interfaces, the particles inhibited the coarsening of ferrite grains. Coupled with compressive testing and strengthening contribution analysis, the strain‒induced precipitation was shown to weaken precipitation strengthening but enhance grain refinement strengthening, thereby providing a novel approach to achieving an optimal balance between microstructural homogeneity and mechanical properties.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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