Microstructure and Mechanical Behavior of X90 Bend Using Local Induction Bending

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• 作者：Bin Wang ; Liang Wang ; Yong Jiang ; Ming Xu…
• 关键词：X90 steel ; Local induction bending ; Microstructure ; Mechanical properties ; Toughness
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：70
• 期：1
• 页码：115-124
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials; Materials Science, general; Tribology, Corrosion and Coatings;
• 出版者：Springer India
• ISSN：0975-1645
• 卷排序：70

文摘

The microstructure and mechanical properties was studied for API (American Petroleum Institute) X90 pipeline steel bend, which was formed by local induction heat. It was found that X90 pipeline steel parent microstructure consisted of quasi-polygonal ferrite, granular bainite and a small amount of M/A constituents, which provided a good mechanical property. The yield strength, tensile strength, and yield ratio was 786, 876 MPa, 0.90, respectively. After local induction bending, strain-induced phase transition behavior occurred within the deformation zone. The neutral axis position was almost free from force, for quenching-tempering microstructure with small grains. Compared to the parent pipe, the strength decreased after local induction bending. At −10 °C, the Charpy impact absorbed energy was higher, which showed good toughness. In addition, the ductile–brittle transition temperature was studied during −20 ~ −40 °C in outer arc side. At −60 °C, the impact absorbed energy was 27 J, which was not suitable for a pipeline.