A systematical analysis with respect to multiple hydrogen traps influencing sulfide stress cracking behavior of API-5CT-C110 casing steel

被引：30
作者：
Zhang, Z. H. [1 ]
Liu, M. [2 ,3 ]
Liu, Y. H. [1 ]
Luo, M. [1 ]
Zhang, C. X. [1 ]
Wang, C. H. [2 ,3 ]
Cao, G. H. [2 ,3 ]
机构：
[1] Baoshan Iron & Steel Co Ltd, Tube & Pipe Dept, Baosteel Res Inst, Shanghai 201900, Peoples R China
[2] Shanghai Univ, State Key Lab Adv Special Steel, 149 Yanchang Rd, Shanghai 200072, Peoples R China
[3] Shanghai Univ, Sch Mat Sci & Engn, 149 Yanchang Rd, Shanghai 200072, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 721卷
关键词：
Steel; Dislocation; Precipitate; Sulfide stress cracking; GRAIN-BOUNDARY-CHARACTER; PIPELINE STEEL; CRYSTALLOGRAPHIC TEXTURE; MICROSTRUCTURE; EMBRITTLEMENT; CORROSION; INCLUSIONS; RECRYSTALLIZATION; SUSCEPTIBILITY; PERMEATION;
D O I：
10.1016/j.msea.2018.02.070
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The irreversible hydrogen traps including Cr-rich M7C3, Mo2C and MC carbides are characterized by scanning transmission electron microscope (STEM) after the quenching-and-tempering process performed on the API-5CT-C110 casing steel. Combined with our previously published work [Mater. Sci. Eng. A 688 (2017) 378-387], a systematic analysis with respect to the hydrogen interactions with reversible traps (grain boundaries and dislocations) and precipitates influencing sulfide stress cracking (SSC) behavior is presented. Grain boundaries provide channels for hydrogen diffusion. Dislocations trap hydrogen and act as hydrogen "transporters" during moving. Precipitates are introducing traps to retain hydrogen and restrict dislocation movement, then improve resistance to SSC. However, the mobile dislocations can transport the trapped hydrogen from precipitates into potential crack sites in the presence of external stress, leading to the initiation of SSC cracks. Therefore, SSC susceptibility significantly depends on the density of dislocations. The steel with lower dislocation density exhibits superior SSC behavior mainly attributed to its finite hydrogen "transporters".
引用
收藏
页码：81 / 88
页数：8
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