Microstructure, microtexture, and crack susceptibility in pearlitic steel during lab-simulated processes aiming tensile armor application in flexible pipelines
Microstructure, microtexture, and crack susceptibility in pearlitic steel during lab-simulated processes aiming tensile armor application in flexible pipelines
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DOI：
10.1016/j.jmatprotec.2023.117950
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发表时间：
2023-03
影响因子：
6.3
通讯作者：
Pablo Bruno Paiva Leão;Shutong Zhang;J. R. B. Neto;S. A. Freire;R. C. Loureiro;A. Ramirez;H. D. de Ab
中科院分区：
文献类型：
--
作者：
Pablo Bruno Paiva Leão;Shutong Zhang;J. R. B. Neto;S. A. Freire;R. C. Loureiro;A. Ramirez;H. D. de Ab
抗拉铠装通常由扁平珠光体钢丝制成，并按以下制造顺序生产：热轧→铅浴淬火处理（PT）→冷成型→钢丝卷取→应力消除→重绕钢丝工艺。为了评估这组工艺中的关键参数对商业珠光体钢的显微组织、显微织构和裂纹敏感性的影响，采用45%热轧、PT和65%冷轧的不同设置对四种工艺路线进行了实验室模拟。随后，通过四种不同路线生产的冷轧试样经历两次应力消除处理（在400和700 °C下持续60 s），随后通过四个交替的三点弯曲程序模拟重新缠绕线材过程。在这项工作中，扫描电子显微镜图像，显微硬度，和电子背散射衍射技术进行了广泛的。由于珠光体块体尺寸的控制，PT影响冷轧过程中{111}< 112 >组分的形成。在弯曲实验期间，仅在具有最高冷轧{111}微观织构取向的路线中检测到裂纹< 112 >，随后在700 °C下消除应力。这种裂纹敏感性与去应力处理过程中{111}珠光体块体剪切带中的小再结晶晶粒形核有关< 112 >。
Tensile armor is usually made of flat pearlitic steel wires and produced in a manufacturing sequence as follows: hot-rolling → patenting treatment (PT) → cold forming → wire coiling → stress relief → re-winding wire process. To evaluate the effect of the key parameters in this set of processes on the microstructure, microtexture, and crack susceptibility in commercial pearlitic steel, four process routes were lab-simulated with different setups of 45% hot-rolling, PT, and 65% cold-rolling. Subsequently, the cold-rolled specimens produced through the four distinct routes underwent two stress relief treatments (at 400 and 700 °C for 60 s), succeeded by simulation of the re-winding wire process via four alternated three-point bending procedures. Scanning electron microscope images, microhardness, and electron backscattered diffraction techniques were extensively performed in this work. Due to pearlitic block size control, the PT influenced the {111}< 112 > component formation during the cold-rolling process. During the bending experiments, cracks were detected just in the route with the highest cold-rolled {111}< 112 > microtexture orientation followed by stress relief at 700 °C. This crack susceptibility was related to the small recrystallized grains nucleated in the shear bands of the {111}< 112 > pearlitic blocks during the stress relief treatment.