SI Zhongyao WANG Zhaoqing LIU Peng YU Dehua LIU Lei ** Institute of Metal Research
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Academia Sinica
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Shenyang
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110015
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China*** Capital Iron and Steel Company
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Beijing
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100053
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China+ To whom correspondence should be addressed
材料科学技术（英文）
Effects of microalloying Ti and B on the microstructures and low temperature toughness of manual metal arc (MMA) deposits were investi- gated.Weld metals containing 200-300 ppm Ti and 29-60 ppm B deposited by manual coated elec- trodes provided an optimum low temperature toughness.The addition of B in weld metals low- ered the γ→α transformation temperature which promoted the acicular ferrite (AF) transformation. Solid solutioned B suppressed grain boundary ferrite as well as side plate ferrite formation and benefited the acicular ferrite formation.Titanium protected B from oxidizing as well as nitriding and formed Ti-Mn silicate inclusions.Ultra-high volt- age electron microscope analyses showed that TiO structure in the Ti-Mn silicate inclusions was the favorable nucleation site for acicular ferrite forma- tion.
关键词:
toughness
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MA Zongyi YAO Zhongkai Harbin Institute of Technology
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Harbin
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China
金属学报(英文版)
The SiC_w/Al composite prepared by squeeze casting has a combination of superior room temperature specific strength and modulus together with excellent thermal properties.The extrusion can make an improvement on the strength and ductility of the composite from 582 MPa as squeeze casted up to 639 MPa,and on the transformation from isotropic to the anisotropic structure.This seems to be explained by the orientation of whiskers and the densification of dislocations in matrix.TEM observation indicates that the stacking fault is the usual planar defect on the SiC_w surface. composite;;SiC whisker;;Al alloy;;microstructure
关键词:
composite
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S.H.O
材料科学技术（英文）
The magnetic property of soft magnetic metals and alloys depends strongly on the crystallographic orientation. In automated equipment for orientation research. the intensity for drawing up the pole figure is measured in detail. The present research shows that the accurate pole figure can be drawn up without measuring concretely the intensity. For directional Si steel sheet the measuring step may be 4 similar to 5 degrees. In this paper the experimental equation for defocusing correction was derived from the experimental data in different specimens with random orientation.
关键词:
Corrosion
This paper introduces the design of a localized corrosion rate monitoring instrument that can monitor and evaluate the maximum and stable localized corrosion rate of a nonpassivable metal in a corrosive environment by measuring the current density in a corrosion sensor with an occluded anode.
关键词:
instrument;localized corrosion rate;monitor
李玉璞
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陈坚
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刘家瑞
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章其初
材料研究学报
<正> Au-Si 系统是一种典型的共晶体系。B.X.Liu 等通过对Au 与Si 迭层膜的研究得到多种组分比和相结构的Au 与Si 的混合层~([1]);S.S.Lau 等通过对Au 膜-Si 衬底样品的研究0得到过Au_(71)Si_(29)(～Au_5Si_2)亚稳相~([2])。本文在更宽的离子束参数及更宽的温区(77—573K)下,系统地研究了Ar 离子束诱导的Au 膜-Si衬底体系的原子混合现象,
关键词:
Guoyou GAN
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Xiuhua CHEN
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Jingchao CHEN
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Xiaolong ZHOU
材料科学技术（英文）
Interaction between single crystal Si and TiC block was studied by electron probe micro analysis (EPMA). The distribution of the reaction products from Si to TiC is reported. The diffusion kinetics constant of Si is given. The implications of the observed microstructure are discussed.
关键词:
Daqian SUN
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Zhenfeng ZHOU
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Wenquan WANG
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Lian LIU
材料科学技术（英文）
The effects of Si, Mn and Al on the microstructure and mechanical properties of ADI weld have been studied. The microstructure of ADI weld metal mainly consists of bainitic ferrite and retained austenite. Mechanical properties of ADI weld increase with increasing Si content, but an excess of Si(3.79%) results in decreasing the austemperability owing to decreasing the carbon content of the matrix austenite. Mn increases the retained austenite volume fraction, but the ductility and impact toughness of weld obviously decrease with increasing Mn content because of increased amount of martenite and twin martenite. In the range of 0.13%~0.64%, increasing Al content favours improving the mechanical properties of ADI weld. Therefore, it is very important to select suitable Si, Mn and Al contents to improve mechanical properties of ADI weld.
关键词:
ADI weld metal
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