硫化氢腐蚀对X80管线钢断裂韧性的影响

doi:10.11901/1005.3093.2015.429

材料研究学报

2016, Vol. 30

Issue (3): 179-185 DOI: 10.11901/1005.3093.2015.429

本期目录 | 过刊浏览

硫化氢腐蚀对X80管线钢断裂韧性的影响

王晶(

), 栾春波

北京工业大学机械工程与应用电子技术学院北京 100022

Effect of Hydrogen Sulfide Corrosion on Fracture Toughness of X80 Pipeline Steel

WANG Jing^**(

), LUAN Chunbo

(College of Mechanical Engineering and Applied Electronics Technology, BeijingUniversity of Technology, Beijing 100022, China)

引用本文:

王晶, 栾春波. 硫化氢腐蚀对X80管线钢断裂韧性的影响[J]. 材料研究学报, 2016, 30(3): 179-185.
Jing WANG, Chunbo LUAN. Effect of Hydrogen Sulfide Corrosion on Fracture Toughness of X80 Pipeline Steel[J]. Chinese Journal of Materials Research, 2016, 30(3): 179-185.

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摘要:

测试X80管线钢分别在未腐蚀状态下及饱和H₂S预腐蚀后的δ-Δa阻力曲线; 分析了H₂S腐蚀对其裂纹扩展阻力曲线,断裂韧性,塑性功等方面影响.结果表明, H₂S腐蚀后X80材料K_IC下限为75.43 MPam^½.对比分析H₂S腐蚀前后测试结果, 发现H₂S腐蚀会对X80钢的断裂韧性产生显著影响: 未腐蚀试样的裂纹扩展阻力曲线明显高于H₂S腐蚀后的; H₂S腐蚀前后材料的稳定裂纹扩展下的启裂韧度δ_0.2BL分别为0.740 mm和0.365 mm, 前者是后者的2.02倍; 扩展量Δa相近的情况下, 未腐蚀试样的裂纹扩展过程所需塑性功是H₂S预腐蚀后的2.29倍左右, H₂S腐蚀明显会降低X80材料的断裂韧度.因此, 管道在输送天然气过程中应尽量避免H₂S的腐蚀, 保证材料的韧性不受破坏.

关键词 ：金属材料, 断裂韧性, 阻力曲线, H2S腐蚀

Abstract：

Fracture toughness of X80 pipeline steel in a simulated petrochemical environment is studied in this paper. Original specimens and saturated H₂S pre-corroded specimens were tested respectively and δ-Δa resistance curves were obtained, while the influence of hydrogen sulfide corrosive environment on the resistance curve, fracture toughness and plastic work of X80 pipeline steel was analyzed. It follows that the lower limit of K_IC of the pre-corroded X80 steel is 75.43 MPam^½, and the hydrogen sulfide corrosion affect significantly on the fracture toughness of X80 steel: the crack growth resistance curve obtained from original specimens is much higher than that of the pre-corroded specimens; the fracture toughness of stable crack propagation δ_0.2BL is 0.740 mm and 0.365 mm respectively, and the former is 2.02 times of the latter. In case for a given amount of crack propagation Δa, the plastic work of the original specimen is about 2.29 times of the pre-corroded specimen. Hydrogen sulfide corrosion reduced the fracture toughness of the X80 steel remarkablely. Thus, in the course of natural gas pipeline, hydrogen sulfide corrosive environment should be avoided to keep the steel a proper high toughness to prevent damage.

Key words： metallic materials fracture toughness resistance curve hydrogen sulfide corrosion

收稿日期: 2015-07-27

ZTFLH:

O346.1+2

基金资助:* 国家自然科学基金青年基金资助项目11302007

作者简介: 王晶

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表1 X80管线钢的主要力学性能

图1 三点弯曲试件示意图

Sample number	F_max / kN	F_Q / kN	F_max/F_Q	a₀ / mm	B / mm	W-a₀ / mm	g₁	K_Q /MPam^1/2	R_P0.2 /MPa	$2.5 K Q R P 0.2 2$ / mm	Validity judgment
10#	23.85	15.57	1.53>1.10	15.64	15.01	14.36	2.84	59.93	661.0	20.55	Invalid
13#	24.49	16.31	1.50>1.10	14.53	15.10	15.27	2.54	65.79	661.0	24.77	Invalid
14#	24.93	18.99	1.31>1.10	14.71	15.02	15.29	2.58	75.43	661.0	32.55	Invalid

表2 硫化氢预腐蚀后X80管线钢平面应变断裂韧度KIC的测试结果

图2 硫化氢预腐蚀后X80管线钢的加载力F与裂纹张开口位移V曲线 (a) 10号试件试验曲线; (b) 13号试件试验曲线; (c) 14号试件试验曲线

表3 未腐蚀试件的启裂韧度δ0.2BL测试结果

表4 硫化氢预腐蚀后的启裂韧度δ0.2BL测试结果

图3 未腐蚀(a)和(b)硫化氢预腐蚀后试样的δ-Δa阻力曲线

图4 未腐蚀(a)和(b)硫化氢预腐蚀后试样的δQ0.2BL及数据分布的有效性判断

Experiment condition	Data distribution requirements	δ_Q0.2BL	δ_max	1.87(R_m/R_p0.2)	$2 dδ da 0.2 BL$	Validity judgment
Original	Meet conditions	0.740	0.749	2.170	0.886	Valid
Pre-corroded	Meet conditions	0.365	0.686	2.170	0.451	Valid

表5 δQ0.2BL的数值及有效性判定

图5 硫化氢预腐蚀前后X80管线钢的阻力曲线对比图

图6 硫化氢预腐蚀前后X80管线钢的位移-力曲线对比图

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