TANG Zhizhong LIU Minzhi Chengdu University of Science and Technology
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Chengdu
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ChinaXIAO Yaotian Institute of Metal Research
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Academia Sinica
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Shenyang
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China Dept.of Metal Materials
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Chengdu University of Science and Technology
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Chengdu
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China
金属学报(英文版)
The effect of different microstructures of steel 30CrMnSiNi2A on the susceptibility of cadmium embrittlement has been studied and compared under the unique yield strength level. The results show that the tempered martensite exhibits the maximum susceptibility to cadmium embrittlement,while the lower bainite shows the minimum susceptibility.The mixed microstructure of the above two has a susceptibility in between.
关键词:
steel 30CrMnSiNi2A
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ZHOU Bangxin SHENG Zhongqi PENG Feng Southwest Center for Nuclear Reactor Engineering Research and Design
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Chengdu
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China P.O.Box 291-601
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Chengdu
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Sichuan
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China
金属学报(英文版)
The bonding layers in dissimilar alloy explosive bonding joints,γ/α stainless steels, copper/carbon steel and brass/γ-stainless steel have been studied by means of TEM tech- nique.The results show that the bonding is obtained by diffusion and local melting at the con- tact surface.The structure of bonding layer not only responds to the compositions of the bond- ing alloys,but also the difference between their thermal conductivities,melting points and recrystallization temperatures,Because of the small molten region and fast cooling rate,the structure of molten region could be amorphous or microcrystals,and both stable and metastable phases exsist.
关键词:
explosive bonding
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ZHOU Bangxin ZHENG Sikui WANG Shunxin Southwest Centre for Nuclear Reactor Engineering Research and Design
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Chengdu
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China [Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A190—A195
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Southwest Centre for Nuclear Reactor Engineering Research and Design
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Chengdu
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China
金属学报(英文版)
The precipitation process of zirconium hydrides induced by stress and strain was investigated by means of electron microscopy in-situ.The precipitating hydrides induced by stress were found to be γ phase with orientation relationship of (110)_γ‖(110)_(αZr),(001)_γ‖ (0001)_(αZr) between γ-hydrides and surrounding matrix.The growth rate of γ-hydrides which was much faster along [110] direction brought them in taper shape.After fracture of y-hydrides,a new one will precipitate at the tip of cracks.This is the essential process of hydrogen-induced delayed cracking in Zircaloy.The precipitating hydrides induced by strain were found to be δ phase with both orientation relationships of(111)_δ‖(0001)_(αZr),(110)_δ‖ (110)_(αZr) or (010)_δ‖(0001)_(αZr),(001)_δ‖(110)_(αZr)between δ-hydride and surrounding matrix.The δ-hydrides become much finer as the strain rate increased.
关键词:
Zircaloy-2
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ZHO U Bangxin Southwest Centre for Reactor Engineering Research and Design
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Chengdu
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China Bangxin
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Professor
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P.O.Box 291-106
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Chengdu 610005
,
China
金属学报(英文版)
After70-90% cold-rolling,strong{111}〈110〉and weak {111},〈112〉 cold-rolled tex- tures and perfect{111}〈112〉 recrystallization texture were obtained in Fe-Si single crys- tals.The cold-rolled textures with different orientations possesses different ability for recov- ery because of the difference of dislocation structure and store energy alter cold-rolling.The recovery taking place at{111}〈112〉orientation region was prior to that at{111}〈110〉 orientation region.hese subgrains with{111}〈112〉 orientation became recrvstallization nuclei during their growth at expending the surrounding matrix which was sluggish in recovery process.The development of recrystallization textures may be suggested as a process of “nucleation in-situ-selective growth”.The formation of(111)textures in low carbon steel sheets has been discussed in the light of this suggestion.
关键词:
Fe-Si single crystal
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YANG Liu Southwestern Jiaotong University
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Chengdu
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ChinaFANG Hongsheng Tsinghua University
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Beijing
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ChinaMENG Zhihe Luoyang Institute of Technology
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China
金属学报(英文版)
A proper addition of Mn to Fe-C alloys could delay the isothermal transformation and change remarkably the TTT-curves to bay-like shape.The concentration of Mn at the α/γ interphase boundary and thir partition between α- and γ- phase were measured by STEM/TEM-EDAX.The results show that the partition of Mn diminishes gradually as the reaction temperature decreases.There exists a certain temperature range with the strong- est Mn concentration spike at the interphase although no Mn partition is found between austenite and ferrite,and this temperature range is correspondent with the bay-temperature on TTT curves of the alloys.It is thus suggests that the change of TTT-curve configuration is due to the partition of alloy elements.The bay-like shape is attributed to the solute drag ef- fect and the solute drag-like effect caused by the enrichment of Mn at the α/γ interphase.
关键词:
TTT curve
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