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Effect of Plastic Deformation and H_2S on Dynamic Fracture Toughness of High Strength Casing Steel 被引量:1
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作者 曾德智 ZHANG Naiyan +3 位作者 TIAN Gang HU Junying ZHANG Zhi SHI Taihe 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期397-403,共7页
The effects of plastic deformation and H2 S on fracture toughness of high strength casing steel(C110 steel) were investigated. The studied casing specimens are as follows: original casing, plastic deformation(PD)... The effects of plastic deformation and H2 S on fracture toughness of high strength casing steel(C110 steel) were investigated. The studied casing specimens are as follows: original casing, plastic deformation(PD) casing and PD casing after being immersed in NACE A solution saturated with H2S(PD+H2S). Instrumented impact method was employed to evaluate the impact behaviors of the specimens, meanwhile, dynamic fracture toughness(JId) was calculated by using Rice model and Schindler model. The experimental results show that dynamic fracture toughness of the casing decreases after plastic deformation. Compared with that of the original casing and PD casing, the dynamic fracture toughness decreases further when the PD casing immersed in H2 S, moreover, there are ridge-shaped feature and many secondary cracks present on the fracture surface of the specimens. Impact fracture mechanism of the casing is proposed as follows: the plastic deformation results in the increase of defect density of materials where the atomic hydrogen can accumulate in reversible or irreversible traps and even recombine to form molecular hydrogen, subsequently, the casing material toughness decreases greatly. 展开更多
关键词 sour gas fields high strength casing C110 steel plastic deformation H2S fracture toughness
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A new strategy to strength-toughen metals: Tailoring disorder 被引量:1
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作者 Minqiang Jiang Lanhong Dai 《Theoretical & Applied Mechanics Letters》 CSCD 2021年第6期362-369,共8页
Metals have been mankind’s most essential materials for thousands of years.In recent years,however,innovation-driven development of major national security strategy and core areas of the national economy is highly im... Metals have been mankind’s most essential materials for thousands of years.In recent years,however,innovation-driven development of major national security strategy and core areas of the national economy is highly impeded by a shortage of advanced higher-strength-toughness metals.One of the main reasons is that metals inherently exhibit the inverted-relationship of strength-toughness.The emergence of two types of disordered metals:amorphous alloys and high entropy alloys,provides a fully-fresh strategy for strength-toughening by tailoring the topological and/or chemical disorder.In this paper,we first briefly review the history of strength-toughening of metals,and summarize the development route-map.We then introduce amorphous alloys and high entropy alloys,as well as some case studies in tailoring disorder to successfully achieve coexisting high strength and high ductility/toughness.Relevant challenges that await further research are summarized in concluding remarks. 展开更多
关键词 Amorphous alloys High entropy alloys Strength-toughening Disorder tailoring plasticity and fracture
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Impact toughness of a gradient hardened layer of Cr5Mo1V steel treated by laser shock peening 被引量:1
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作者 Weiguang Xia Lei Li +5 位作者 Yanpeng Wei Aimin Zhao Yacong Guo Chenguang Huang Hongxiang Yin Lingchen Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2016年第2期301-308,共8页
Laser shock peening(LSP) is a widely used surface treatment technique that can effectively improve the fatigue life and impact toughness of metal parts.Cr5Mo1 V steel exhibits a gradient hardened layer after a LSP p... Laser shock peening(LSP) is a widely used surface treatment technique that can effectively improve the fatigue life and impact toughness of metal parts.Cr5Mo1 V steel exhibits a gradient hardened layer after a LSP process.A new method is proposed to estimate the impact toughness that considers the changing mechanical properties in the gradient hardened layer.Assuming a linearly gradient distribution of impact toughness,the parameters controlling the impact toughness of the gradient hardened layer were given.The influence of laser power densities and the number of laser shots on the impact toughness were investigated.The impact toughness of the laser peened layer improves compared with an untreated specimen,and the impact toughness increases with the laser power densities and decreases with the number of laser shots.Through the fracture morphology analysis by a scanning electron microscope,we established that the Cr5Mo1 V steel was fractured by the cleavage fracture mechanism combined with a few dimples.The increase in the impact toughness of the material after LSP is observed because of the decreased dimension and increased fraction of the cleavage fracture in the gradient hardened layer. 展开更多
关键词 Laser shock peening Gradient hardened layer plastically affected depth Impact toughness Cleavage fracture
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Effects of Ni on austenite stability and fracture toughness in high Co-Ni secondary hardening steel 被引量:1
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作者 Chen-chong Wang Chi Zhang Zhi-gang Yang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第2期177-183,共7页
Three kinds of high Co Ni secondary hardening steels with different Ni contents were studied. The nanoscale austenite layers formed at the interface of matensite laths were observed. Both observation and diffusion kin... Three kinds of high Co Ni secondary hardening steels with different Ni contents were studied. The nanoscale austenite layers formed at the interface of matensite laths were observed. Both observation and diffusion kinetic simulation results showed that both Ni and Co did not obtain enough time to get the equilibrium content in this system. The Ni content in austenite layers decreased significantly, and Co content increased slightly with the decrease of Ni content in overall composition. The austenite stability was estimated by Olson-Cohen model, in which both chemical and mechanical driving force could be calculated by equilibrium thermodynamic and Mohr's circle methods, respectively. Simulation and mechanical test results showed that The decrease of Ni content in austenite layers would cause the change of austenite stability and decrease the fracture toughness of the steels. When the Ni content in the overall composition was lower than 7 wt. %, the Ni content in y phase would be lower than 20 wt.%. And the simulation value of M; (stress induced critical martensite transformation temperature) would be up to 80 ℃, which was about 60℃ higher than room temperature. Based on the analysis, the Ni content in the overall composition of high Co Ni secondary hardening steels should be higher than 8 wt. % in order to obtain a good fracture toughness. 展开更多
关键词 Austenite stability Transformation-induced plasticity fracture toughness Diffusion kinetic Element distribution
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