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A method to study interface diffusion of arsenic into a Nb-Ti microalloyed low carbon steel 被引量:3
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作者 yuan-zhi zhu Jian-ping XU 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第9期821-826,共6页
A novel diffusion couple method was used to investigate the interface diffusion of arsenic into a Nb-Ti microalloyed low carbon steel and its effects on phase transformation at the interface. It is discovered that the... A novel diffusion couple method was used to investigate the interface diffusion of arsenic into a Nb-Ti microalloyed low carbon steel and its effects on phase transformation at the interface. It is discovered that the content of arsenic has great effect on grain growth and phase transformation at high temperature. When the arsenic content is no more than lwt%, there is no obvious grain growth and no obvious ferrite transitional region formed at the diffusion interface. However, when the arsenic content is no less than 5wt%, the grain grows very rapidly. In addition, the arsenic-enriched ferrite transitional layer forms at the diffusion interface in the hot-rolling process, which results from a slower diffusion rate of arsenic atoms than that of carbon in ferrite. 展开更多
关键词 low carbon steel alloy steel ARSENIC diffusion bonding phase transformation grain growth
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Evolution of carbides and carbon content in matrix of an ultra-high carbon sintered steel during heat treatment process 被引量:3
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作者 yuan-zhi zhu Zhe zhu +1 位作者 Zhi-min Yin Zhi-dong Xiang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第3期299-303,共5页
DTA, thermal expansion, XRD, and SEM were used to evaluate the effect of quenching temperature on the mechanical properties and microstructure of a novel sintered steel Fe-6Co-1Ni-5Cr-5Mo-1C. Lattice parameters and th... DTA, thermal expansion, XRD, and SEM were used to evaluate the effect of quenching temperature on the mechanical properties and microstructure of a novel sintered steel Fe-6Co-1Ni-5Cr-5Mo-1C. Lattice parameters and the mass fraction of carbon dissolved in the matrix of the steel quenched were investigated. It is discovered that the hardness of the steel increases with quenching temperature in the range of 840-900℃ and remains constant in the range of 900 to 1100℃. It decreases rapidly when the temperature is higher than 1100℃. The mass fraction of carbon dissolved in the matrix of the steel quenched at 840℃ is 0.38, but when the quenching temperature is increased to 1150℃, it increases to 0.98. The carbides formed during sintering are still present at grain boundaries and in the matrix of the steel quenched at low quenching temperatures, such as 840℃. When the quenching temperature is increased to 1150℃, most of the carbides at grain boundaries are dissolved with just a small amount of spherical M23C6 existing in the matrix of the quenched steel. 展开更多
关键词 ultra-high carbon sintered steel heat treatment mechanical properties microstructure
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Grain boundary segregation of minor arsenic and nitrogen at elevated temperatures in a microalloyed steel 被引量:2
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作者 yuan-zhi zhu Zhe zhu Jian-ping Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第5期399-403,共5页
Auger electron spectroscopy (AES) was used to investigate the grain boundary segregation of arsenic and nitrogen in a kind of microalloyed steel produced by a compact strip production (CSP) technology at 950 to 1... Auger electron spectroscopy (AES) was used to investigate the grain boundary segregation of arsenic and nitrogen in a kind of microalloyed steel produced by a compact strip production (CSP) technology at 950 to 1100℃, which are similar to the hot working temperature of the steel on a CSP production line. It was discovered that arsenic segregated on grain boundaries when the steel was annealed at 950℃ for 2 h. When the annealing temperature increased to 1100℃, arsenic was also found to have segregated on grain boundaries in the early annealing stage, for instance, within the first 5 min annealing time. However, if the holding time of the steel at this temperature increased to 2 h, arsenic diffused away from grain boundaries into the matrix again. Nitrogen was not found to have segregated on grain boundaries when the steel was annealed at a relatively low temperature, such as 950℃. But when the annealing temperature increased to 1100℃, nitrogen was detected to have segregated at grain boundaries in the steel. 展开更多
关键词 alloy steel ARSENIC NITROGEN SEGREGATION grain boundaries
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Effects of the microstructure of twin roll cast and hot rolled plates on the surface quality of presensitized plates
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作者 yuan-zhi zhu Ya-Feng Zhang +1 位作者 Chao-Qi Zhao Feng Zhou 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第9期919-924,共6页
The effect of the microstructure of plates fabricated both in the traditional process, involving casting, hot rolling and cold rolling (HR), and in the novel twin roll casting + cold rolling (TRC) process on the ... The effect of the microstructure of plates fabricated both in the traditional process, involving casting, hot rolling and cold rolling (HR), and in the novel twin roll casting + cold rolling (TRC) process on the surface quality of presensitized (PS) plates was analyzed by optical microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDXS). The formation of pores on the surface of the electrolyzed HR plate could be attributed to the presence of approximately 1-μm-sized large Al-Fe precipitates in the HR plate compared to the smaller precipitates in the TRC plate. Moreover, residual graphite lubricants used during the TRC process were entrapped on the surface of the TRC plate during the subsequent rolling process. The entrapped pollutants tended to further deteriorate the formation of pores on the surface of the TRC plate, and no residual carbon was detected on the surface of the HR plate. Furthermore, the surface quality of the TRC plate can be improved by surface cleaning before the cold rolling process, which could dramatically lower the residual graphite on the surface. 展开更多
关键词 aluminum plates MICROSTRUCTURE presensitizing surface quality
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Heteroatom-Doped Black Phosphorus and Its Application:A Review 被引量:3
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作者 Lu-dong He Pei-chao Lian +2 位作者 yuan-zhi zhu Jun-ping Zhao Yi Mei 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2021年第3期690-700,共11页
Few-layer black phosphorus(BP)is a promising semiconductor with excellent optoelectronic properties.However,the poor stabilization and strong asymmetry between electron and hole transports hinder the application of BP... Few-layer black phosphorus(BP)is a promising semiconductor with excellent optoelectronic properties.However,the poor stabilization and strong asymmetry between electron and hole transports hinder the application of BP.Doping of heteroatoms is an effective strategy to regulate the electronic structure and stability of BP without sacrificing its unique 2D structure,which is a promising way to tune the physico-chemical properties of BP for various applications.In this review,the recent advances in doping engineer-ing of BP are summarized,involving the theoretical prediction of new characteristic for doped BP and the corresponding experimental synthesis methods.The effects of dopant atoms on the structure and perfor-mance of BP and its related applications,such as the field-effect transistors,optoelectronic devices,in-verter devices,and catalysis,are also summarized. 展开更多
关键词 Black phosphorus PHOSPHORUS Doping methods Physicochemical properties I Sensors
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