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Effect of Microstructure on hydrogen induced cracking Behavior of a High Deformability Pipeline Steel

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Journal of Iron and Steel Research International 2015年第10期22卷 937-942页

作者： Xian-bo SHI Wei YAN Wei WANG Lian-yu ZHAO Yi-yin SHAN Ke YANG Institute of Metal Research Chinese Academy of Sciences University of Chinese Academy of Sciences Petro China Pipeline Company

The hydrogen induced cracking （HIC） behavior of a high deformability pipeline steel was investigated with three different dual-phase microstructures, ferrite and bainite （F＋B）, ferrite and martensite/austenite islands （F＋M/A） and ferrite and martensite （F＋M）, respectively. The HIC test was conducted in hydrogen sulfide （H2S）-saturated solution. The results showed that the steels with F＋B and F＋M/A dual-phase microstructures had both higher deformability and better HIC resistance, whereas the harder martensite phase in F＋M microstructure was responsible for the worst HIC resistance. The band-like hard phase in dual-phase mi- crostructure was believed to lead to increasing susceptibility to HIC.

关键词： pipeline steel high deformability dual-phase microstructure mechanical property hydrogen induced cracking

Stress Oriented hydrogen induced cracking of Linepipe Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 121-128页

作者： Wan Keun Kim Gyu Tae Park Kyoo Young Kim Pohang University of Science and Technology Graduate Institute of Ferrous Technology San 31Hyoja-DongPohang 790-784Korea

The stress oriented hydrogen induced cracking (SOHIC) is a typical hydrogen embrittlement phenomenon occurring in the linepipe steels exposed to sour environment containing H 2 S ***,even recently,the cracking mechanism of SOHIC has not been clarified because of lacking in the empirical data on the actual failure mode of SOHIC *** factors affecting SOHIC are discussed in terms of metallurgy of high strength linepipe steel and hydrogen *** cracking mechanisms of SOHIC are examined by comparing them with the empirical failure mode of SOHIC which is developed by observation of the actual fracture sites of the hydrogen induced blister cracking (HIBC) and secondary ***,the correlation between SOHIC and HIC is discussed.

关键词： linepipe steel stress oriented hydrogen induced cracking hydrogen induced cracking metallurgical factor diffusible hydrogen

(Ⅰ+Ⅱ)MIXED MODE hydrogen induced cracking

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Acta Metallurgica Sinica(English Letters) 1989年第4期2卷 279-283页

作者： GAO Hua XUE Lijue Shanghai University of Engineering Science,Shanghai,China Associate Professor,Dept.of Materials,Shanghai University of Engineering Science,350 Xianxia Road,Shanghai,China

hydrogen induced cracking(HIC)of 0.3% C,1% Cr,1% Mn,1% Si high strength steel has been studied under simple mode Ⅰ,mode Ⅱ and(Ⅰ+Ⅱ)mixed mode loading ***- ter being hydrogen-charged in IN H_2SO_4 solution,the material behaved hydrogen embrittlement in all the cases *** threshold K_(ⅡH)/K_(ⅡX) of HIC under mode Ⅱ load- ing was 0.27,which was nearly the same as that K(ⅠH)/K_(ⅠX)=0.29 under mode Ⅰ loading. While the thresholds of-HIC under(Ⅰ+Ⅱ)mixed mode loading were 0.36,0.41 and 0.37 cor- responding to the K_Ⅱ/K_Ⅰ ratio of 0.27,0.4 and *** results show that simple mode Ⅰ or mode Ⅱ loading is more susceptible to hydrogen embrittlement than(Ⅰ+Ⅱ)mixed mode. For explaining the experimental results,the effects of triaxial stress as well as plastic deformation ahead of crack tip has been discussed.

关键词： (Ⅰ+Ⅱ)mixed mode hydrogen induced cracking

Relationship between Critical hydrogen Concentration and Applied Stress for hydrogen induced cracking in 0.2 wt—%C Annealed Plain Steel

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Journal of Materials Science & Technology 1990年第6期6卷 447-449页

作者：张柏玉唐祥云 Dept.of Materials Science and Engineering Tsinghua University Beijing 100084 China.

*** far there are few people who studythe relationship between the criticalhydrogen concentration and the stress forhvdrogen induced cracking (CCHIC)*** researchers have cal-culated the CCHIC of steels under no stress... 详细信息

关键词： hydrogen induced cracking plain steel critical hydrogen concentration stress

INFLUENCE OF GRAIN SIZE ON STRENGTH AND hydrogen induced cracking OF DUPLEX STAINLESS STEELS

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Acta Metallurgica Sinica(English Letters) 1991年第1期4卷 21-24页

作者： HE Jianhong Huazhong University of Science and Technology,Wuhan,ChinaTANG Xiangyun CHEN Nanping Tsinghua University,Beijing,China Dept.of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

The relation between grain size and strength of the duplex stainless steels and influence of grain size on properties of hydrogen induced cracking in these steels have been investigated. The Hall-Petch relation between grain size and strength of the steels is also *** susceptibility to hydrogen induced cracking of the steels increases with increasing grain size.

关键词： duplex stainless steel hydrogen induced cracking grain size

TEM Study on hydrogen-induced cracking of Fe_3Al Alloy

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Journal of University of Science and Technology Beijing 2001年第1期8卷 35-38页

作者： Biao Gu, Lijie Qiao, Wuyang Chu Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China Material Science/Engineering School Univ. of Science/Technology Beijing Beijing 100083 China

hydrogen-induced cracking (HIC) of Fe3Al alloy was studied by in situ transmission electron microscope (TEM). Electron transparent specimens were mounted onto a constant displacement device. Stress was applied to the specimen by using a bolt through the device. The results showed that hydrogen enhanced the dislocation emission and motion in Fe3Al alloy. A dislocation free zone (DFZ) was formed following the dislocation emission. Microcrack initiated in the DFZ or at the main crack tip when the emission reached a critical extension. hydrogen played an important role in the process of brittle fracture of Fe3Al alloy.

关键词： TEM Fe3Al intermetallics hydrogen induced cracking dislocation emission dislocation free zone

Stress Oriented hydrogen induced cracking of Linepipe Steel

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Stress Oriented Hydrogen Induced Cracking of Linepipe Steel

hydrogen-induced cracking of Weld Metal of Austenitic Stainless Steels

第六届国际低合金高强度钢会议

作者： Wan Keun Kim Gyu Tae Park Kyoo Young Kim Pohang University of Science and Technology Graduate Institute of Ferrous Technology San 31Hyoja-DongPohang 790-784Korea

The stress oriented hydrogen induced cracking(SOHIC) is a typical hydrogen embrittlement phenomenon occurring in the linepipe steels exposed to sour environment containing HS ***,even recently,the cracking mechanism of SOHIC has not been clarified because of lacking in the empirical data on the actual failure mode of SOHIC *** factors affecting SOHIC are discussed in terms of metallurgy of high strength linepipe steel and hydrogen *** cracking mechanisms of SOHIC are examined by comparing them with the empirical failure mode of SOHIC which is developed by observation of the actual fracture sites of the hydrogen induced blister cracking(HIBC) and secondary ***,the correlation between SOHIC and HIC is discussed.

关键词： linepipe steel stress oriented hydrogen induced cracking hydrogen induced cracking metallurgical factor diffusible hydrogen

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Journal of Materials Science & Technology 2002年第4期18卷 375-377页

作者： ChuanPAN LijieQIAO 等 DepartmentofWeldingResearch CentralIorn&SteelResearchInstituteBeijing100081China DepartmentofMaterialsPhysics UniversityofScience&TechnologyBeijingBeijing100083China

For 308L and 347L weld metals of austenitc stainless steels (ASS), hydrogen induced cracking (HIC) occurred during dynamically charging under constant load. The threshold stress intensity for HIC, Km, decreased linearly with the logarithm of the concentration of diffusible hydrogen C0 in the weld metals and the rolled plate of type 304L ASS, i.e., KIH=85.2-10.71nC0 (308L), KIH=76.1-9.31n C0(347L), and KIH=91.7-10.11nC0(304L). The fracture mode for HIC in the three type of ASS changed from ductile to brittle with the decrease in the applied stress intensity KI or/and the increase in C0. The boundary line between ductile and brittle fracture surfaces was KI-54+25exp(-C0/153)=0.

关键词： Austenitic stainless steel hydrogen induced cracking Fracture

Influence of Microstructures on Polarization Resistance and hydrogen-induced cracking of a Micro-Alloyed Steel Submitted to Different Cooling Rates

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Journal of Iron and Steel Research International 2011年第S1期18卷 168-172页

作者： González M R Martins de Araújo D S Goldenstein H Alonso-Falleiros N Departamento de Engenharia Metalúrgica e de Materiais EscolaPolitécnicaUniversidade de Sao Paulo-SP-Brasil

The effect of different microstructures on the polarization resistance (Rp) and the hydrogen-induced cracking (HIC) of a micro-alloyed steel austenitized and submitted to different cooling rates was *** 19.1 x 6 x 2 mm,containing the whole thickness of the plate were extracted from a 20 mm plate and heat treated on a quenching dilatometer,were submitted to Rp and HIC corrosion *** Rp and HIC tests followed as close as possible ASTM G59 and NACE standard TM0284-2003,in this case,modified only with regard to the size of the *** samples transformed from austenite by a slow cooling (cooling rate of 0.5℃.s-1) showed higher susceptibility to hydrogen-induced cracking,with large cracks in the middle of the sample propagating along segregation bands,corresponding to the centerline of the plate *** cooling rates of 10℃.s-1,only small cracks were found in the matrix and micro cracks nucleated at non-metallic *** higher cooling rates (40℃.s-1) very few small cracks were detected,linked to non-metallic *** result suggests that structures formed by polygonal structures and segregation bands (were eutectoid microconstituents predominate) have higher susceptibility to *** predominantly formed by acicular ferrite make it difficult to propagate the cracks among non-oriented and interlaced acicular ferrite *** segregation bands containing eutectoid products also help inhibit cracking and crack propagation;segregation bands can function as pipelines for hydrogen diffusion and offer a path of stress concentration for the propagation of cracks,frequently associated to non-metallic *** resistance essays performed on the steel in theas received condition,prior to any heat treatment,showed larger differences between the regions of the plate,with a considerably lower Rp in the *** austenitization heat treatments followed by cooling rates of 0.5 e 10℃.s-1 made more uniform the

关键词： hydrogen induced cracking polarization resistance micro-alloyed steel control cooling