厚规格X80管线钢低温断裂行为研究

doi:10.11901/1005.3093.2016.791

材料研究学报

2018, Vol. 32

Issue (1): 33-41 DOI: 10.11901/1005.3093.2016.791

研究论文

本期目录 | 过刊浏览

厚规格X80管线钢低温断裂行为研究

洪良¹, 左秀荣¹(

), 姬颍伦¹, 马歌¹, 董俊媛¹, 陈雷²

1 郑州大学物理工程学院材料物理教育部重点实验室郑州 450052
2 郑州航空工业管理学院机电工程学院郑州 450052

Fracture Behavior of Thick X80 Pipeline Steel Plates at -25℃

Liang HONG¹, Xiurong ZUO¹(

), Yinglun JI¹, Ge MA¹, Junyuan DONG¹, Lei CHEN²

1 School of Physical Engineering, Key Laboratory of Materials and Physics (Zhengzhou University), Ministry of Education, Zhengzhou 450052, China
2 School of Mechatronic Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450052, China

引用本文:

洪良, 左秀荣, 姬颍伦, 马歌, 董俊媛, 陈雷. 厚规格X80管线钢低温断裂行为研究[J]. 材料研究学报, 2018, 32(1): 33-41.
Liang HONG, Xiurong ZUO, Yinglun JI, Ge MA, Junyuan DONG, Lei CHEN. Fracture Behavior of Thick X80 Pipeline Steel Plates at -25℃[J]. Chinese Journal of Materials Research, 2018, 32(1): 33-41.

全文: PDF(10213 KB) HTML

摘要:

采用金相显微镜和扫描电子显微镜对厚规格X80管线钢微观组织和-25℃落锤撕裂试验断口形貌进行观察,研究了X80管线钢的断裂行为与组织之间的关系。研究发现,钢板从表面到厚度中心,针状铁素体体积分数逐渐降低,并出现较多的粒状贝氏体、多边形和准多边形铁素体。具有较高针状铁素体体积分数的钢板,其落锤撕裂剪切面积也越高,多边形和准多边形铁素体以及大尺寸MA岛的存在能够导致解理断裂的产生,不利于钢板的低温断裂韧性。在裂纹扩展的过程中,主裂纹附近组织出现变形,导致脆硬性的MA岛周围出现微孔,微孔与微孔之间随着组织变形相互连接而形成微裂纹。二次裂纹通常在针状铁素体周围出现转折或停滞,说明针状铁素体有利于阻碍裂纹的扩展,提高钢板的断裂韧性。

关键词 ：金属材料, 管线钢, X80, 落锤撕裂试验, 断裂行为, 组织

Abstract：

The effect of microstructure on tearing fracture behavior for thick plates of X80 pipeline steel was assessed at -25 oC by means of drop-weight tear tester (DWTT),as well as optical microscopy and scan electron microscopy (SEM). The result shows that the volume fraction of acicular ferrite reduced gradually in the thickness direction and reached a minimum level at the center of the plate, whilst more volume fraction of granular bainite (GB), polygonal-like ferrite (PF) and quasi-polygonal-like ferrite (QF) appeared. The higher volume fraction of acicular ferrite of the plate is, the larger tearing share area will be. In addition, the existence of PF and QF, and large size martensite-austenite (MA) could lead to the initiation of cleavage crack, and reduce the fracture toughness of the plate. During the crack propagation process, microstructures near the main crack deformed and elongated seriously, but the hard and brittle MA can hardly deform, resulting in the growth of voids and formation of micro cracks. The secondary crack is always reflected by or arrested on acicular ferrite boundaries, which demonstrates that the acicular ferrite has good toughness, and thereby retards the crack propagation effectively.

Key words： metallic materials pipeline steel X80 drop-weight tear test fracture behavior microstructure

收稿日期: 2016-12-30

ZTFLH:

TG142.1

作者简介:

作者简介洪良,男,1991年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.791 或 https://www.cjmr.org/CN/Y2018/V32/I1/33

表1 X80管线钢化学成 (质量分数, %)

图1 DWTT试验试样尺寸示意图

图2 -25oC时DWTT宏观断口形貌

表2 DWTT断口断裂面积分数(测试温度-25oC)

图3 1#、2#试样不同厚度位置带状组织

图4 1#、2#试样不同厚度处SEM照片

表3 X80管线钢中AF, GB, PF+QF, BF和MA体积分数

图5 1#、2#试样不同厚度MA岛组织

图6 1#、2#试样MA岛尺寸分布

图7 DWTT试样断口主裂纹附近组织SEM形貌 (a) 组织变形与微孔分布;(b) (a)图中方框放大图;(c) 解理断裂区主裂纹与组织;(d) 剪切唇区微孔与微裂纹

图8 DWTT断口边缘二次裂纹SEM形貌

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