加热温度对X80M管线钢性能和组织的影响

徐海健; 韩楚菲; 郭诚; 龙山; 田永久; 沙孝春

doi:10.7513/j.issn.1004-7638.2024.01.020

加热温度对X80M管线钢性能和组织的影响

doi: 10.7513/j.issn.1004-7638.2024.01.020

1.
鞍钢股份有限公司, 辽宁鞍山 114009
2.
鞍钢建设集团有限公司, 辽宁鞍山 114009

详细信息

作者简介:
徐海健，1987年出生, 男，博士研究生，从事先进钢铁结构材料的研究， E-mail：haijianxu2013@163.com

通讯作者:
沙孝春，1966年出生, 男，教授级高级工程师，从事先进钢铁结构材料的研究；E-mail: xiaochunsha@ansteel.com.cn

中图分类号: TF76,TG142.1
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出版历程
- 收稿日期: 2023-04-07
- 刊出日期: 2024-02-29

Effect of heating temperature on the mechanical properties and microstructures of X80M pipeline steels

1.
Anshan Iron & Steel Co., Ltd., Anshan 114009, Liaoning, China
2.
Anshan Iron & Steel Construction Co., Ltd., Anshan 114009, Liaoning, China

摘要

摘要: 研究了不同加热温度对厚壁X80M管线钢原始奥氏体晶粒、组织、析出相及力学性能的影响。结果表明，加热温度对厚规格X80M管线钢的落锤性能影响较大。随着加热温度逐渐升高，奥氏体晶粒不断粗化，当加热温度≤1210 ℃时，原始奥氏体晶粒细小，奥氏体晶粒的平均尺寸为35 μm。原始奥氏体晶粒越细小，在后续轧制和冷却过程中越能促进针状铁素体和粒状贝氏体的形核，即显著改善钢板的低温韧性。此外，加热温度越高，铸坯中合金元素的固溶量越多，能促进20 nm以下的NbC析出相的形成，但会导致晶粒粗化和组织中针状铁素体及粒状贝氏体比例减少。因此，控制加热温度在1210 ℃以下，保证针状铁素体（AF）和粒状贝氏体（GB）比例在60%以上时，可显著改善厚规格X80M管线钢的落锤性能。
- X80M管线钢 /
- 加热温度 /
- 落锤性能 /
- 针状铁素体 /
- 粒状贝氏体
Abstract: The effects of heating temperatures on the prior austenite grain size, microstructure and mechanical properties of X80M pipeline steels with a large wall thickness were investigated in this paper. The results showed that the heating temperature has a great effect on the drop weight tear test (DWTT) properties of X80M pipeline steels. The austenite grains continued to coarsen with enhancing the heating temperatures. The average austenite grain size was within 35 μm by controlling the heating temperature below 1210 ℃. The finer prior austenite grains provide more nucleation sites of acicular ferrite (AF) and granular bainite (GB), and improve the low temperature toughness of steel plates during the subsequent rolling and cooling processes. Moreover, the higher solution degree of alloy elements in the casting blank promotes the formation of finer NbC precipitates with the sizes less than 20 nm by increasing heating temperature. It also leads to the grain coarsening and the decrease of AF and GB proportions in the microstructure. Therefore, the DWTT properties of X80M pipeline steels with the large wall thickness can obviously be improved by controlling the heating temperatures below 1210 ℃ and ensuring the acicular ferrite (AF) and granular bainite (GB) phase contents more than 60%.
- X80M pipeline steel /
- heating temperature /
- drop weight tear test properties /
- acicular ferrite /
- granular bainite

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图 1 不同加热温度下厚壁X80M管线钢原始奥氏体晶粒形态

Figure 1. Microstructures of prior austenite grain of thick-wall X80M pipeline steel at different heating temperatures

（a）1150 ℃；（b）1180 ℃；（c）1210 ℃；（d）1240 ℃

下载: 全尺寸图片幻灯片

图 2 加热温度对X80M管线钢显微组织的影响

Figure 2. Effect of heating temperatures on microstructure of X80M pipeline steel

（a）1150 ℃；（b）1180 ℃；（c）1210 ℃；（d）1240 ℃

下载: 全尺寸图片幻灯片

图 3 不同加热温度下X80M管线钢的析出相形貌

Figure 3. Morphologies of precipitates of X80M pipeline steel at different heating temperatures

（a）1150 ℃；（b）1180 ℃；（c）1210 ℃；（d）1240 ℃

下载: 全尺寸图片幻灯片

图 4 小尺寸NbC析出相的TEM分析

（a）NbC高分辨晶格像；（b）高分辨像的傅里叶变换；（c）FFT过滤的NbC高分辨晶格像

Figure 4. TEM analysis of small NbC precipitates

下载: 全尺寸图片幻灯片

图 5 大尺寸Ti₂N析出相的TEM分析

（a）Ti₂N高分辨晶格像；（b）高分辨像的傅里叶变换；（c）FFT过滤的Ti₂N高分辨晶格像

Figure 5. TEM analysis of large Ti₂N precipitates

下载: 全尺寸图片幻灯片

表 1 厚壁X80M管线钢的主要化学成分

Table 1. Main chemical composition of thick-wall X80M pipeline steel %

C Si Mn P S Al Nb+Ti Cr+Cu+Mo+Ni

≤0.05 0.2 1.7 ≤0.10 ≤0.002 0.030 0.07~0.11 0.61~0.75

下载: 导出CSV

表 2 不同加热温度下X80M管线钢力学性能对比

Table 2. Mechanical properties of X80M pipeline steel at different heating temperatures

加热温度/ ℃ R_p_0.2/MPa R_m/MPa −20 ℃下的
A_kv2/J −15 ℃下的
DWTT/%

1150 535 650 352 93
1180 542 661 330 88
1210 546 668 316 85
1240 560 683 301 70

下载: 导出CSV

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