Microstructure and strengthening mechanisms of heavy gauge pipeline steel processed by ultra-fast cooling (UFC) versus laminar cooling (LC)

IF 1.7 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Ironmaking & Steelmaking Pub Date : 2023-05-31 DOI:10.1080/03019233.2023.2216093

Haijian Xu, Chunfei Han, Yan Zang, Wenyue Liu, Weijuan Li, X. Sha

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Abstract

ABSTRACT In this study, a novel thermo-mechanical controlled processing (TMCP) schedule, based on ultrafast cooling (UFC), was used to fabricate heavy gauge X80 pipeline steels for solving the low qualification drop-weight-tear test (DWTT) properties. The microstructures of the X80 pipeline steels were all composed of quasi-polygonal, acicular ferrite (AF), and granular bainite (GB) produced by Laminar Cooling (LC) and UFC. The grain sizes were finer and the average length of HAG was higher produced by UFC. The main strengthening mechanisms in LC-process steel were grain strengthening and precipitation strengthening, and dislocation strengthening. However, the main strengthening contribution in UFC-process was related to grain strengthening and dislocation strengthening. The decrease in strength induced by reducing Nb, Mo, and Cr contents in UFC steel was compensated by increasing the contribution of grain strengthening. In conclusion, the low-cost X80 pipeline steels can be produced by UFC without degradation of strength and toughness.

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超快冷却(UFC)与层流冷却(LC)处理大口径管线钢的组织与强化机理

摘要:本研究采用一种基于超快冷却(UFC)的新型热机械控制加工(TMCP)工艺，制备了大口径X80管道钢，以解决其低质量的跌落-重量-撕裂试验(DWTT)性能。X80管线钢的显微组织均由准多边形针状铁素体(AF)和层流冷却(LC)和UFC产生的粒状贝氏体(GB)组成。UFC制备的HAG晶粒尺寸更细，平均长度更高。lc工艺钢的强化机制主要有晶粒强化、析出强化和位错强化。而ufc过程的强化主要与晶粒强化和位错强化有关。在UFC钢中，降低Nb、Mo和Cr含量导致的强度下降通过增加晶粒强化的贡献得到补偿。综上所述，采用UFC技术可以生产低成本的X80管线钢，且强度和韧性不降低。

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来源期刊

Ironmaking & Steelmaking 工程技术-冶金工程

CiteScore

3.70

自引率

9.50%

发文量

125

审稿时长

2.9 months

期刊介绍： Ironmaking & Steelmaking: Processes, Products and Applications monitors international technological advances in the industry with a strong element of engineering and product related material. First class refereed papers from the international iron and steel community cover all stages of the process, from ironmaking and its attendant technologies, through casting and steelmaking, to rolling, forming and delivery of the product, including monitoring, quality assurance and environmental issues. The journal also carries research profiles, features on technological and industry developments and expert reviews on major conferences.