YU Xuejie WANG Jianlin Shanghai Iron and Steel Research Institute
,
Shanghai
,
ChinaZHOU Tianjian Anhui Institute of Technology
,
Hefei
,
China YU Xuejie
,
Senior Engineer
,
Shanghai Iron Steel Research Institute
,
1001 Taihe Road
,
Wusong
,
Shanghai
,
China.
金属学报(英文版)
In order to clarify that the IFP and the “Type 2”α phase are also arising from TiC,a metastable β-Ti alloy was selected for investigation in this work.The results showed that af- ter heating the alloy just below the α+β→β transus temperature and quenching,the TiC lay- er existed at the α/β interface.The morphology of TiC is similar to that of the IFP arising from TiH_2 in the α-β two-phase alloys.The IFP TiC also provided an easy crack path or the crack initiation sites.The fracture is also identical to that caused by IFP TiH_2.The arced diffractions(characteristic of “Type 2”α)were found in the selected area diffraction pat- terns of some specimens which had been isothermally aged after solid solution treatment.The particles which bring on the arced diffractions may be TiC on the basis of structure and lat- tice parameter analysis,not the so called “Type 2”α phase.
关键词:
interface phase(IFP)
,
null
,
null
,
null
XU Wenchong MA Xiang SUN Fuyu ZONG Guisheng Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China XU Wenchong
,
Senior Engineer
,
Department No.13
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China
金属学报(英文版)
The strain-induced isothermal precipitation and the law of coarsening of Nb,V and Ti carbonitrides in Nb-steel.V-steel.Nb-V steel and Ti-V-Nb steel have been investigated systematically by means of STEM,EDAX,a new extraction replica technique and the quanti- tative phase analyses method.
关键词:
microalloyed steels
,
null
,
null
,
null
REN Jianshi ZHAO Huilin ZHANG Gongshu Institute of Metal Research
,
Academia Sinica.Shenyang
,
China ZHANG Gongshu
,
Senior Engineer
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
Glow discharge cathodic sputtering of alloys containing second phase precipitates or injected oxide particles has been observed with energy dispersive X-ray spectrometer and scanning electron microprobe.It was shown that the formation of cones during the sputtering in these alloys is due to masking of the matrix by glow sputtering second phase precipitates or oxide particles.At steady state,the density of cottes were found to be a function of the densities pre- cipitates or oxide particles in bulk alloy.In addition to the changes of local sputtering rate,the electrostatic effect may play a role on the formation fo cones.
关键词:
glow discharge
,
null
,
null
ZHENG Yunrong RUAN Zhongci Institute of Aeronautical Materials
,
Beijing
,
China ZHENG Yunrong
,
Senior Engineer
,
Laboratory No.4 Institute of Aeronautical Materials
金属学报(英文版)
In consideration of the envelopment of γ dendrites by the Hf-rich melts at the late period of solidification of the cast Ni-base superalloys containing Hf,a heat of brazing filler alloy composed of Ni-18.6Co-4.5Cr-4.7 W-25.6Hf(wt-%)was prepared.This alloy is hypereutectic.γ phase is the leading phase in eutectic γ+Ni_5Hf and γ bars are surrounded by Ni_5Hf phase.At the section perpendicular or parallel to the γ growing direction,the eutectic morphology is cellular or laminar respectively.The content of Ni_5Hf in the alloy is 68.7v.-%. The compositions of primary and eutectic Ni_5Hf are very similar.Ni,Co and Hf are the main elements and solubility of Cr and W in Ni_5Hf is very low.This alloy is an ideal brazing filler suitable to the directional or single crystal superalloy,and the elements are beneficial to superalloys properties.This filler alloy is of low melting point and of good fluidity.After braz- ing at 1240℃,5 min+1190℃,I h in 10~(-3) Pa vacuum,the microstructure of bond is the same as that of Hf-bearing superalloy.No Si and B contamination is involved.
关键词:
Ni-Hf brazing alloy
,
null
,
null
,
null
,
null
Yanhong WEI
,
Yingchun ZHANG
,
Renpei LIU
,
Zujie DONG
材料科学技术（英文）
A computer-aided system for simulating weld solidification crack has been developed by which a welding engineer can carry out the welding solidification crack simulation on the basis of a commercial finite element analysis software package. Its main functions include calculating the heat generations of the moving are, mesh generation, calculating stress-strain distributions with element rebirth technique.
关键词:
杨涛
,
李开越
,
姜锋
,
高殿斌
玻璃钢/复合材料
doi:10.3969/j.issn.1003-0999.2008.03.012
大梁带芯模较长(9m),宽度较窄(50mm),因此将大梁带铺放设备设计为龙门式结构.主要包括X、Y轴直线运动机构和Z轴旋转运动机构.将预浸带铺放过程中所必需的放料装置、除膜装置、张力控制装置、施压装置、剪切装置集中设计在铺放头内部.在Pro/Engineer中建立了大梁带铺放机的三维立体模型,研究大梁带铺放机各机构的运动方式,利用Pro/Engineer的运动仿真模块对大梁带铺放机的铺放过程进行了计算机仿真.
关键词:
预浸带铺放
,
铺放头
,
复合材料
,
仿真
Kee-Hyeon Cho
,
Byung-Moon Kim
材料科学技术（英文）
In the present study, a numerical optimization program has been developed for predicting the optimal secondary cooling patterns in a continuous slab caster. Optimization strategy using Broydon-Fletcher-Goldfarb-Shanno (BFGS) method is carried out by determining the constant heat transfer coefficients in each spray zone, which could satisfy the casting conditions and metallurgical criteria specified by the engineer. From the present results, it is found that even a slight variation in the pouring temperature, allowable surface temperature, and casting speed could give rise to the changes in the cooling pattern throughout the spray zones.
关键词:
Continuous casting
,
null
,
null
NING Hua ZHANG Lixin Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
The segregation behaviour of P and its effect on structure of 70%-reduction cold rolled Fe-P alloys containing different contents of P,e.g.,0.007,0.06 and 0.09% P,during annealing at 200-700℃ under vacuum have been studied by means of metallography and EPMA.The P was found to segregate preferentially along dislocation line during recovery annealing.The P-riched dislocation densing region,the P-depleted region and the sub-grain-like boundary thus formed.The nuclei grow preferentially during recrystallization in such region that the P segregation is more evident and the residual strain by dislocation densing increases to large extent.After recrystallizing,the P segregates along grain boundaries and makes the grains in alloy fine. Engineer,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang 110015,China
关键词:
P
,
null
,
null
,
null
冯古雨
,
曹海建
,
钱坤
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2015.06.005
借助Pro/Engineer绘图软件,建立三维浅交弯联机织复合材料及弯曲压头的结构模型,进行弯曲性能研究.借助ANSYS Workbench有限元软件,探究复合材料在5mm弯曲位移载荷作用下纤维、树脂和复合材料的应力、应变分布,并对复合材料的破坏模式进行预测.结果表明:三维浅交弯联机织复合材料在弯曲载荷的作用下,试样与上、下压头接触处最容易发生弯曲破坏;三维浅交弯联机织复合材料在承载弯曲载荷时,增强体纤维起到主要承载作用,树脂基体起次要承载作用;在5 mm的弯曲载荷作用下,复合材料的破坏模式主要是树脂的破碎.
关键词:
有限元分析
,
三维机织复合材料
,
浅交弯联
,
弯曲载荷
黄东男
,
于洋
,
宁宇
,
马玉
材料工程
doi:10.3969/j.issn.1001-4381.2013.03.007
采用了一种基于Deform-3D结合Pro/Engineer的对分流模挤压过程中焊合而相互穿透网格进行重构的技术,并对空心型材分流模挤压过程中金属的流动行为、温度场及模芯受力情况进行了模拟分析.结果表明,网格重构技术对于空心型材挤压的数值模拟具有可行性,可实现焊合面与对称面不一致(非流动对称面)空心型材的分流、焊合及成形的挤压全过程的仿真,从而为研究挤压全过程(尤其是焊合过程)的金属流动行为、模具结构的合理性、变形体的温度场分布情况、焊合阶段模具的受力等提供了一种新的计算分析方法.
关键词:
分流模挤压
,
网格重构
,
数值模拟
,
Deform-3D
