FU Xuli
,
LI Jun
,
WANG Wu
,
YANG Yongqing
,
SHU Guangji Southeast University
,
Nanjing
,
China
金属学报(英文版)
Eutectic Bi/MnBi magnetic alloy was prepared by directional solidification.When the growth rate,R>2 cm/h,the MnBi fibre spacing,λ,distributed homogeneously in Bi matrix,follows λ~2R=constant.The thermal gradient.G_L,does not influence λ.The magnetic property,B_r of Bi/MnBi alloy decreases with the increase of R and increases with the increase of G_L.
关键词:
eutectic Bi/MnBi alloy
,
null
,
null
,
null
,
null
JIANG Da-wei
,
GE Chang-sheng
,
ZHAO Xiang-juan
,
LI Jun
,
SHI Lu-lu
,
XIAO Xue-shan
钢铁研究学报(英文版)
A new family of economical duplex stainless steels in which N or Mn was substituted for Ni with composition of 22Cr-80Mn-xNi-10Mo-07Cu-07W-03N (x=05-20) have been developed by examining the microstructure, mechanical and corrosion properties of these alloys. The results show that these alloys have a balanced ferrite-austenite relation. In addition, the alloys are free of precipitation of sigma phase and Cr-nitride when solution-treated at 750 to 1300 ℃ for 30 min. The yield strength, tensile strength and fracture elongation values of experimental alloys solution-treated at 1050 ℃ for 30 min are about 500, 750 MPa and 400%, respectively. Low-temperature impact properties can be improved distinctly with the increase of nickel content. Among the designed DSS alloys, the alloy with Ni of 20% is found to be an optimum alloy with proper phase proportion, better low-temperature impact properties and higher pitting corrosion resistance compared with those of other alloys. The mechanical and corrosion properties and lower production cost of the designed DSSs are better than those of AISI 304.
关键词:
economical duplex stainless steel
,
low-temperature impact property
,
pitting corrosion resistance
MA Zheng-huan
,
ZHAO Xiang-juan
,
GE Chang-sheng
,
DING Tie-suo
,
LI Jun
,
XIAO Xue-shan
钢铁研究学报(英文版)
A new family of resource-saving, high chromium and manganese super duplex stainless steels (DSSs), with a composition in mass percent, % of Cr 0.29, Mn 0.12, Ni 2.0, Mo 1.0, and N 0.51-0.68, has been developed by examining the effect of N on the microstructure, mechanical properties and corrosion properties. The results show that these alloys have a balanced ferrite-austenite relation. The austenite volume fraction decreases with the solution treatment temperature, but it increases with an increase in N content. The increases in nitrogen enhance the ultimate tensile strength (UTS) and reduce the ductility of the material slightly. The pitting corrosion potential increases first and then decreases with an increase in nitrogen content when the amount of N arrives to 0.68%. The yield stress and ultimate tensile strength of solution-treated samples were more than 680 and 900 MPa, the elongation of experimental alloys are higher than 30%, respectively, what is more, the pitting potentials were beyond 1100 mV.
关键词:
duplex stainless steel
,
microstructure
,
mechanical property
,
pitting potential
WANG Jian
,
LI Jun
,
WANG Xin-feng
,
et al
钢铁研究学报(英文版)
The effects of rapid heating (heating rate ranging from 15℃/s to 300℃/s) during the final annealing process on microstructure evolution and magnetic properties of cold rolled non-oriented electrical steel had been investigated. It was found that the heating rate increasing could cause the substantially refined structures for the recrystallization grains and this grain refinement would decline when the heating rate beyond 50℃/s. The recrystallization texture exhibited pronounced improvement with hearting rate, such as the intensity decrease of {111}//ND fiber and the intensity increase of {110}<100> Goss component. The texture improvement and grain size refinement caused by heating rate increasing resulted in complicated variation of the magnetic properties. The magnetic induction (B50) keeps increasing while the heating rate increasing from 15℃/s to 300℃/s and the core losses variation (P1.5/50) is reverse, but it begins to increase when the heating rate ranges from 100 to 300℃/s. The results indicate that recrystallization texture and the magnetic properties of the non-oriented electrical steel have been improved definitely by the rapid heating during the final annealing treatment.
关键词:
Non-oriented electrical steels;Rapid heating;Texture;Core loss;Magnetic Induction.
LIANG Xuan
,
LI Jun
,
PENG Yinghong
钢铁研究学报(英文版)
The effect of recrystallization annealing temperature on the properties and microstructure of onestep cold rolled steel strip for shadow mask was studied. The results showed that there was no yield point elongation when the tensile tests were performed on the samples for annealing temperatures ranging from 750 ℃ to 810 ℃. Moreover, increasing annealing temperature resulted in large grains, which was beneficial to the formability and magnetic property of steel strips. On the other hand, when the sample was annealed at 840 ℃, its microstructure showed ununiformity with 004% yield point elongation, which was not good for the function of the shadow mask. Therefore, the proper recrystallization annealing temperature was about 810 ℃ for the present steel strip for shadow mask.
关键词:
steel strip;shadow mask;mechanical property;microstructure;recrystallization annealing
李志宏
,
柳卫平
,
白希祥
,
郭冰
,
连钢
,
颜胜权
,
王宝祥
,
陆昀
,
曾晟
,
苏俊
原子核物理评论
doi:10.3969/j.issn.1007-4627.2005.01.006
利用8Li次级束测量了质心系能量7.8 MeV 2H(8Li, 9Li)1H反应的角分布, 导出了8Li(d, p)9Li反应的天体物理S因子及9Li→8Li+n虚衰变的渐近归一化系数.
关键词:
8Li(d,p)9Li反应
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角分布
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天体物理S因子
,
渐近归一化系数
HUANG Jianshun CHEN Junming Shanghai Institute of Metallurgy
,
Academia Sinica
,
Shanghai
,
China Research Associate
,
Shanghai Institute of Metallurgy
,
Academia Sinica
,
Shanghai 200050
,
China
金属学报(英文版)
Crystal structure of γ-Li_xFe_2O_3,inserted Li electrochemically,was studied by Moss- bauer spectroscopy together with X-ray diffraction,XPS and electrochemical method,On the insertion of Li at low current density,the crystal structure is keeping original spinel; while at higher current density or by thermal activation,owing to violent movement of Li~+ ions,part of crystal structure transforms into rock type similar to face-centered cubic structure of ferrous oxide.The transition channels during insertion of Li~+ ions and limitation of Li~+ ions inserted were discussed.
关键词:
null
,
null
,
null
Journal of Materials Research
The effect of Li(3)N additive on the Li-Mg-N-H system was examined with respect to the reversible dehydrogenation performance. Screening Study with varying Li(3)N additions (5, 10, 20, and 30 mol%) demonstrates that all are effective for improving the hydrogen desorption capacity. Optimally, incorporation of 10 mol% Li(3)N improves the practical capacity from 3.9 wt% to approximately 4.7 wt% hydrogen at 200 degrees C, which drives the dehydrogenation reaction toward completion. Moreover, the capacity enhancement persists well over 10 de-/rehydrogenation cycles. Systematic x-ray diffraction examinations indicate that Li(3)N additive transforms into LiNH(2) and LiH phases and remains during hydrogen cycling. Combined structure/property investigations suggest that the LiNH(2) "seeding" should be responsible for the capacity enhancement, which reduces the kinetic barrier associated with the nucleation of intermediate LiNH(2). In addition, the concurrent incorporation of LiH is effective for mitigating the ammonia release.
关键词:
complex hydrides;improvement;mixtures;imides;amide;h-2
