冷却速率对超高强度X90M管线钢相变行为的影响

doi:10.13251/j.issn.0254-6051.2024.05.027

金属热处理 ›› 2024, Vol. 49 ›› Issue (5): 162-167.DOI: 10.13251/j.issn.0254-6051.2024.05.027

冷却速率对超高强度X90M管线钢相变行为的影响

刘干^1,2, 孔祥磊^1,2, 黄明浩^1,2, 王杨^1,2, 张英慧^1,2

1.海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009;
2.鞍钢集团钢铁研究院, 辽宁鞍山 114009

收稿日期:2023-10-28 修回日期:2024-03-14 出版日期:2024-05-25 发布日期:2024-06-28
作者简介:刘干（1995—），男，硕士，主要研究方向为超高强度管线钢、超低碳钢等新产品和工艺技术开发，E-mail：18242221224@163.com。

Effect of cooling rate on phase transformation behavior of ultra-high strength X90M pipeline steel

Liu Gan^1,2, Kong Xianglei^1,2, Huang Minghao^1,2, Wang Yang^1,2, Zhang Yinghui^1,2

1. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
2. Iron and Steel Research Institute of Angang Group, Anshan Liaoning 114009, China

Received:2023-10-28 Revised:2024-03-14 Online:2024-05-25 Published:2024-06-28

摘要/Abstract

摘要： 采用Gleeble-3800型热模拟试验机研究了超高强度X90M管线钢在不同冷却速率下的相变行为,根据热膨胀曲线、维氏硬度和显微组织分析结果绘制了动态CCT曲线。结果表明,随着冷速的提高,X90M管线钢的室温组织依次发生多边形铁素体(PF)+贝氏体(B)→针状铁素体(AF)→贝氏体铁素体(BF)转变,其显微硬度也逐渐增加,整体呈上升趋势;且随着冷速的提高,铁素体形貌依次呈块状、针状、板条状形态;同时,马氏体/奥氏体(M/A)岛数量增多,尺寸细化,分布逐渐弥散。实验室条件下,采用30 ℃/s左右的冷速可使X90M管线钢获得具有高密度位错和弥散分布的细小M/A岛的组织。

关键词: X90M管线钢, CCT曲线, 相变行为, 冷却速率, 显微硬度

Abstract: Phase transformation behavior of X90M pipeline steel at different cooling rates was studied by Gleeble-3800 thermal simulation tester. The dynamic CCT curves were plotted based on the thermal expansion curve, Vickers hardness, and microstructure analysis results. The results show that with the increase of cooling rate, the microstructure of the X90M pipeline steel undergoes polygonal ferrite (PF)+bainite (B) → acicular ferrite (AF) → bainitic ferrite (BF) transformation in turn, and its microhardness also gradually increases, showing an overall upward trend. And with the increase of cooling rate, the ferrite is in blocky, acicular and flat morphology in order. Meanwhile, the number of martensite/austenite(M/A) islands increases, the size is refined and the distribution gradually disperses. Under laboratory conditions, adopting a cooling rate of about 30 ℃/s can enable the X90M pipeline steel to obtain a microstructure with high-density dislocations and dispersed small M/A islands.

Key words: X90M pipeline steel, CCT curves, phase transformation behavior, cooling rate, microhardness

中图分类号:

TG142.1

刘干, 孔祥磊, 黄明浩, 王杨, 张英慧. 冷却速率对超高强度X90M管线钢相变行为的影响[J]. 金属热处理, 2024, 49(5): 162-167.

Liu Gan, Kong Xianglei, Huang Minghao, Wang Yang, Zhang Yinghui. Effect of cooling rate on phase transformation behavior of ultra-high strength X90M pipeline steel[J]. Heat Treatment of Metals, 2024, 49(5): 162-167.

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冷却速率对超高强度X90M管线钢相变行为的影响

Effect of cooling rate on phase transformation behavior of ultra-high strength X90M pipeline steel

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