Thermomechanical fatigue damage behavior and deformation mechanism of coke drum with Cr-Mo steel

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials at High Temperatures Pub Date : 2022-10-11 DOI:10.1080/09603409.2022.2132720

Zhibing Lu, X. Chen, Z. Fan, J. Dong

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Abstract

ABSTRACT Damage behaviour and deformation mechanism of SA387Gr11CL2 (1.25Cr-0.5Mo) low alloy steel for coke drum in the thermomechanical fatigue regime are investigated. The experimental results indicate that a main macroscopic crack is detected in the gauge section of each testing specimen. Multiple crack initiation sources are observed in the fracture surface. There are a great deal of secondary cracks in the crack propagation region of the fracture surface. Longitudinal-section microcrack initiates on the specimen surface and its propagation path is predominantly transgranular. When the crack propagation arrives at the threshold with the cyclic number increase, crack bifurcation is obviously observed. Fatigue is the dominant damage of SA387Gr11CL2 low alloy steel under the thermomechanical fatigue loading. The dominant deformation mechanism of SA387Gr11CL2 low alloy steel during thermomechanical fatigue cycle is wavy slip of dislocations. The types and morphologies of carbides in SA387Gr11CL2 low alloy steel are not changed after plastic deformation. Graphical abstract

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Cr-Mo钢焦炭筒的热疲劳损伤行为及变形机理

研究了SA387Gr11CL2 (1.25Cr-0.5Mo)低合金钢在热疲劳状态下的损伤行为和变形机理。试验结果表明，各试件的规范截面均存在主要的宏观裂纹。断口表面存在多个起裂源。断裂面裂纹扩展区存在大量的次生裂纹。纵向微裂纹始于试样表面，其扩展路径以穿晶为主。随着循环次数的增加，裂纹扩展到达阈值时，裂纹出现明显的分岔现象。疲劳是SA387Gr11CL2低合金钢在热疲劳载荷作用下的主要损伤形式。SA387Gr11CL2低合金钢在热疲劳循环中的主要变形机制是位错的波状滑移。塑性变形后，SA387Gr11CL2低合金钢中碳化物的种类和形态没有发生变化。图形抽象

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来源期刊

Materials at High Temperatures 工程技术-材料科学：综合

CiteScore

1.90

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： Materials at High Temperatures welcomes contributions relating to high temperature applications in the energy generation, aerospace, chemical and process industries. The effects of high temperatures and extreme environments on the corrosion and oxidation, fatigue, creep, strength and wear of metallic alloys, ceramics, intermetallics, and refractory and composite materials relative to these industries are covered. Papers on the modelling of behaviour and life prediction are also welcome, provided these are validated by experimental data and explicitly linked to actual or potential applications. Contributions addressing the needs of designers and engineers (e.g. standards and codes of practice) relative to the areas of interest of this journal also fall within the scope. The term ''high temperatures'' refers to the subsequent temperatures of application and not, for example, to those of processing itself. Materials at High Temperatures publishes regular thematic issues on topics of current interest. Proposals for issues are welcomed; please contact one of the Editors with details.