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Acta Metallurgica Sinica(english Letters) 2024年第2期37卷 293-307页

作者： Hong-Jiang Wan Xiao-Qi Wu Hong-Liang Ming Jian-Qiu Wang en-hou han School of Materials Science and engineering University of Science and Technology of ChinaShenyang110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and engineering Northeastern UniversityShenyang110819China Institute of Corrosion Science and Technology Guangzhou510530China

The effects of hydrogen charging time and pressure on the hydrogen embrittlement(HE)susceptibility of X52 pipeline steel material are studied by slow strain rate tensile *** fracture morphologies of the specimens are observed by scanning electron *** HE susceptibility of the X52 pipeline steel material increases with an increase in both hydrogen charging time and hydrogen *** a charging time of 96 h,the HE susceptibility index reaches 45.86%,approximately 3.6 times that at a charging time of 0 ***,a charging pressure of 4 MPa results in a HE susceptibility index of 31.61%,approximately 2.5 times higher than that at a charging pressure of 0.3 MPa.

关键词： Hydrogen embrittlement X52 pipeline steel material Tubular specimen Hydrogen charging time Hydrogen charging pressure

Mechanical Behavior and Failure Mechanism of an As-Extruded Mg-11wt%Y Alloy at Elevated Temperature

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Acta Metallurgica Sinica(english Letters) 2024年第6期37卷 969-981页

作者： Lan Zhang Dao-Kui Xu Bao-Jie Wang Cui-Lan Lu Shuo Wang Xiang-Bo Xu Dong-Liang Wang Xin Lv en-hou han School of Materials Science and engineering University of Science and Technology of ChinaShenyang110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of environmental and Chemical engineering Shenyang Ligong UniversityShenyang110159China Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Institute of Corrosion Science and Technology Guangdong510070China

Through carrying out the high-temperature tensile experiments on an as-extruded Mg-11wt%Y alloy at 350℃,400℃,450℃,500℃and 550℃,the mechanical behavior and fracture mechanisms at elevated temperatures are investigated and *** results show that with the increase of temperature,the yield strength and ultimate tensile strength of the alloy increase at first and then decrease,while that the elongation ratio decreases firstly and then *** the sample being tested at 350℃,the values of yield strength,ultimate tensile strength and the elongation ratio are 188 MPa,266 MPa and 11%,*** 400℃,the yield strength and ultimate tensile strength reach the maximum values of,respectively,198 MPa and 277 MPa,but the elongation ratio is the lowest and its value is only 8%.When the applied temperature is increased to 550℃,the values of yield strength and ultimate tensile strength,respectively,decrease to 140 MPa and 192 MPa and the elongation ratio increases to 38%.Failure analysis demonstrates that the fracture surfaces of different samples are mainly composed of plastic dimples and exhibit the typical characteristic of ductile *** observation to the fracture side surfaces indicates that at the temperatures of 350℃and 400℃,microcracks mainly initiate in the interior of Mg_(24)Y_(5)*** the temperatures are 450℃,500℃and 550℃,the cracks preferentially initiate at the Mg_(24)Y_(5)/α-Mg interfaces.

关键词： Mg-Y alloy High-temperature tensile properties Fracture mechanism Failure analysis

Cl-induced passivity breakdown in α-Fe_(2)O_(3)(0001), α-Cr_(2)O_(3)(0001),and their interface: A DFT study

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Journal of Materials Science & Technology 2022年第34期129卷 70-78页

作者： Xiaoran Yin Haitao Wang en-hou han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and engineering University of Science and Technology of ChinaShenyang 110016China Institute of Corrosion Science and Technology Guangzhou 510530China

The presence of chloride ions is the critical factor of passivity breakdown of the protective film and eventually leads to localized corrosion. However, the mechanism and the role of chlorides in these processes are still controversial. Hematite and chromia are generally believed to be the major components of outer and inner oxide layers on stainless steels. In the present paper, a comparative study of Cl ingress into pristine and defective α-Fe_(2)O_(3)(0001) surface, α-Cr_(2)O_(3)(0001) surface, along with their interface, was conducted using density functional theory. Vacancy formation energy calculation confirms good stability of α-Cr_(2)O_(3)and high reactive activity of the interface region. Cl inserts into an O vacancy is energetically more favorable than Fe vacancy and interstitial site, demonstrating Cl-induced degradation complies with the ion exchange model. Transition state search for Cl diffusion through O vacancies shows α-Cr_(2)O_(3)is more protective than α-Fe_(2)O_(3), while the interface region is the weak point of the duplex passive film.

关键词： Hematite Chromia DFT+U Interface Cl-induced depassivation

Effect of Nb Content on Microstructure and Mechanical Properties of Mo_(0.25)V_(0.25)Ti_(1.5)Zr_(0.5)Nbx High-entropy Alloys

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Acta Metallurgica Sinica(english Letters) 2022年第10期35卷 1641-1652页

作者： Fengqi Zhang Chao Xiang en-hou han Zijian Zhang Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and engineering University of Science and Technology of ChinaShenyang110016China Institute of Corrosion Science and Technology Guangzhou510530China

High-entropy alloys(HEAs)have significant application prospects as promising candidate materials for nuclear industry due to their excellent mechanical properties,corrosion resistance and irradiation *** this work,the Mo_(0.25)V_(0.25)Ti_(1.5)Zr_(0.5)Nb_(x)(x=0,0.25,0.5,0.75 and 1.0)HEAs were designed and *** alloys were prepared by vacuum arc melting,and all the ingots were annealed at 1200℃ for 24 *** microstructures,crystal structures,hardness and mechanical properties of Mo_(0.25)V_(0.25)Ti_(1.5)Zr_(0.5)Nb_(x) HEAs were *** as-cast alloys are composed of single BCC ***,the single BCC phase is retained after annealing at 1200℃ for 24 *** compressive and microhardness tests show that the strength and hardness of the alloys decrease gradually with the increase of Nb content,while the plasticity increases and the fracture mode of the alloy changes from brittle fracture to ductile fracture,which is mainly owing to the decrease of grain *** addition of Nb significantly improves the plasticity of the Mo_(0.25)V_(0.25)Ti_(1.5)Zr_(0.5)Nb_(x) *** particular,Nb1.0 alloy can reach 28.32%strain without fracture,which exhibits promising potential in industrial application.

关键词： High-entropy alloy CALPHAD Microstructure Hardness Mechanical properties

Effect of thermal ageing and dissolved gas on corrosion of 308L stainless steel weld metal in simulated PWR primary water

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Journal of Materials Science & Technology 2022年第1期96卷 308-324页

作者： Xiaodong Lin Qunjia Peng Yaolei han en-hou han Wei Ke Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Suzhou Nuclear Power Research Institute Suzhou 215004China School of Materials Science and engineering University of Science and Technology of ChinaShenyang 110016China Institute of Materials Shanghai UniversityShanghai 200072China

The corrosion of unaged and 7000-h thermally aged 308 L stainless steel weld metals in simulated PWR primary water under aerated and deaerated conditions was investigated,involving the corrosion of austenite,δ-ferrite andδ-ferrite/austenite phase *** results revealed that thermal ageing for 7000 h had a limited effect on the corrosion behavior of 308 L weld metal as it only increased the inner oxide thickness ofδ-ferrite slightly under the deaerated *** obvious corrosion enhancement of 308 L weld metal under the aerated condition was found compared to the deaerated condition regardless of the thermal ***,Cr-enrichment on the surface of oxide particles,dissolved regions at the metal/oxide interface and localized corrosion along theδ-ferrite/austenite phase boundary occurred under the aerated condition.

关键词： Stainless steel weld metal Thermal ageing Corrosion High temperature water TEM

Deformation and cracking behaviors of proton-irradiated 308L stainless steel weld metal strained in simulated PWR primary water

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Journal of Materials Science & Technology 2022年第25期120卷 36-52页

作者： Xiaodong Lin Qunjia Peng en-hou han Wei Ke Institute of Materials Shanghai UniversityShanghai 200072China Suzhou Nuclear Power Research Institute Suzhou 215004China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The proton-irradiated 308L stainless steel weld metal was strained by using constant extension rate tensile testing in simulated PWR primary water, and its deformation microstructures and irradiation assisted stress corrosion cracking(IASCC) behavior were investigated. The results suggest that the irradiation significantly increases the SCC susceptibility of 308L weld metal and causes various deformation microstructures including lathy faulted planes, dislocation channels and deformation twins in austenite and atomic plane rotation in δ-ferrite. The propagation of intergranular IASCC cracks is closely related to the location of the crack tip. For the crack tip in the specimen matrix interior, localized deformation is likely the key factor responsible for the crack growth. For the crack tip close to the specimen surface, however, localized corrosion along the grain boundary rather than the localized deformation appears to dominate the crack propagation. Unlike the intergranular cracks, the IASCC cracks along the δ-ferrite/austenite phase boundary can initiate either by crack initiation at the phase boundary or by crack propagation from the grain boundary. In both cases, the cracked phase boundaries contain a large number of carbides and are severely corroded, but no deformation microstructures are observed, which implies that the localized corrosion may play an important role in the IASCC along the phase boundary. In addition, δ-ferrite can retard the IASCC crack propagation along the grain boundary, which is probably related to the reduction of localized deformation by δ-ferrite.

关键词： Stainless steel weld metal Proton irradiation Deformation microstructures Irradiation assisted stress corrosion cracking Grain and phase boundaries

Effect of Initial Oxide Film on the Formation and Performance of Plasma Electrolytic Oxidation Coating on 7075 Aluminum Alloy

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Acta Metallurgica Sinica(english Letters) 2022年第9期35卷 1559-1571页

作者： Mingyu Zhu Yingwei Song Kaihui Dong Dayong Shan en-hou han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and engineering University of Science and Technology of ChinaHefei230026China

In the early stage of plasma electrolytic oxidation(PEO),the quick formation of the initial oxide film on the surface of the aluminum substrate is necessary for the subsequent discharge spark ***,the compactness of the initial oxide film greatly affects the quality of the PEO coating,but the related mechanisms are not investigated in *** this paper,the status of the initial oxide film was adjusted by adding the(NaPO)into the based electrolyte,and then the effect of initial oxide film on the formation of the PEO coating was *** and chemical composition were analyzed by scanning electron microscope,transmission electron microscopy and X-ray photoelectron *** compactness of the initial oxide film was characterized by Mott-Schottky *** corrosion resistance was measured by electrochemical impedance *** results show that the addition of(NaPO)can promote the co-deposition of phosphide compound into the initial oxide film and improve the film compactness,which is beneficial for the more uniform spark discharge in the later *** a result,the addition of(NaPO)is helpful to obtain PEO coating with better performance.

关键词： Aluminum alloys Plasma electrolytic oxidation Initial oxide film Growth process Spark discharge Compactness

Effect of Normal Force on Fretting Wear Behavior of Zirconium Alloy Tube in Simulated Primary Water of PWR

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Acta Metallurgica Sinica(english Letters) 2023年第5期36卷 865-880页

作者： Yusheng Zhang Jiang Lai Hongliang Ming Lixia Gao Jianqiu Wang en-hou han School of Materials Science and engineering University of Science and Technology of ChinaShenyang110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Nuclear Power Institute of China Chengdu610213China

The effect of normal force on fretting wear behavior of zirconium alloy tube mated with grid dimple in simulated primary water of pressurized water reactor nuclear power plant was *** showed that the maximum wear depth,wear volume and wear coefficient of Zr alloy tube in simulated primary water at 315℃ gradually increased with increasing normal force,while the friction coefficient gradually *** process could be divided into four stages according to the variation of friction coefficient during *** normal force exceeds 30 N,the fretting regime would transition from gross slip regime to partial slip regime after 3×10^(7 )*** was aggravated with increasing normal force,while abrasive wear became slighter.A thicker third-body layer with monoclinic ZrO_(2) was formed by the tribo-sintering mechanism under higher normal *** addition,the schematic evolution processes of delamination and third-body layer formation were displayed according to morphology observation.

关键词： Zirconium alloy tube Fretting wear Grid-to-rod High-temperature pressurized water Normal force

Fretting wear behavior of Zr alloy cladding tube mated with Zr alloy dimple under mixed fretting regime in simulated primary water of PWR

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Journal of Materials Science & Technology 2023年第27期158卷 43-52页

作者： Yusheng Zhang Hongliang Ming Jiang Lai Lixia Gao Jianqiu Wang en-hou han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and engineering University of Science and Technology of ChinaShenyang 110016China Nuclear Power Institute of China Chengdu 610213China

The fretting wear behavior of Zr alloy cladding tube under mixed fretting regime in a high-temperature pressurized water was *** main wear mechanism is adhesive wear,with characters of small-scale delamination at the center of worn area and serious delamination on the worn edge.A long crack throughout the worn area and other cracks propagated towards the substrate are *** cross-sectional microstructure of worn area can be divided into a thick third-body layer,thin inner oxide layer and thick tribologically transformed structure layer,and their formation mechanisms are analyzed in ***,the mixed fretting regime process and the microstructural evolution during fretting wear are discussed.

关键词： Fretting wear Mixed fretting regime Zr alloy tube High temperature pressurized water Microstructure

Effect of phosphate conversion film on fatigue and corrosion fatigue behavior of an as-rolled Mg–3.08Zn–0.83Al(in wt.%)alloy

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Journal of Iron and Steel Research(International) 2023年第12期30卷 2557-2565页

作者： Bao-jie Wang Dao-kui Xu Shuo Wang Xiang-bo Xu en-hou han School of environmental and Chemical engineering Shenyang Ligong UniversityShenyang110159LiaoningChina Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina Binzhou Institute of Technology Binzhou256606ShandongChina Shandong Key Laboratory of Advanced Aluminium Materials and Technology Binzhou256606ShandongChina Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819LiaoningChina

Through investigating and comparing the fatigue behavior of an as-rolled Mg–3.08Zn–0.83Al(in wt.%)alloy performing surface phosphate conversion film treatment,it revealed that the determined fatigue strength of surface treated samples at 106 cycles in air was 65 MPa,whereas the fatigue strength was only 35 MPa when tested in 3.5 wt.%NaCl *** analysis demonstrated that in air,the fatigue crack initiation was mainly dominated by the interaction between the retarding effect of phosphate conversion film on cyclic slips occurring in the underneath *** the matrix cannot endure the accumulated stress concentration due to the irreversibility of cyclic slips,the fatigue crack will preferentially initiate at sample *** the phosphate conversion film cracked easily under the cyclic loading and lost its protectiveness on the substrate in 3.5 wt.%NaCl solution,fatigue cracks were preferentially nucleated at the localized corrosion pits.

关键词： Mg alloy Corrosion fatigue Surface film Pitting Crack initiation