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条状铁素体     
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  banded ferrite
     Effect of Banded Ferrite on Properties of ZG20CrMo Steel
     条状铁素体对ZG20CrMo钢性能的影响
短句来源
     The mechanical properties of the ZG20CrMo steel with banded ferrite in varying degrees has been investigated. Research results are of great significance for application of the ZG20CrMo steel.
     本文研究了具有不同程度条状铁素体的ZG2 0CrMo钢的力学性能 ,所得结果对ZG2 0Mo钢的应用具有重要的指导意义
短句来源
  bar ferrite
     Effect of Bar Ferrite on Properties of ZG20MnSi Steel
     条状铁素体对ZG20MnSi钢性能的影响
短句来源
     (2)The fine carbide from the bar ferrite can improve the mechanical properties of the diffusion bonding joints;
     ②焊缝中条状铁素体内大量细小碳化物的析出,提高了扩散焊接头的机械性能;
短句来源
  ferrite lath
     In thermal Simulated way,Simulating specimens of needle ferrite,lath ferrite,boundary ferrite of all kind of morphology.
     采用热模拟方法,模拟不同形态的针状铁素体,板条状铁素体,边界状铁素体。
短句来源
     Steel specimens were thermally simulated to form needle ferrite, lath ferrite and widmanstatten structure.
     采用热模拟方法 ,模拟不同形态的针状铁素体、板条状铁素体和魏氏组织的试样 ,测定试样的断裂参量。
短句来源
  “条状铁素体”译为未确定词的双语例句
     The mechanical properties of the ZG20MnSi steel with different degrees bar- fertile has been investigated.
     研究了具有不同程度条状铁素体的ZG20MnSi钢的力学性能,发现少量条状铁素体有利于钢的综合力学性能。
短句来源
     The microstructure of 84% acicular ferrite and 16% retained austenite in the low carbon modular cast iron was obtained by austenitizing at 900℃ and austempering at 370℃ for proper time then air cooling to room temperature.
     低碳球墨铸铁经过900℃奥氏体化,在370℃等温适当时间,空冷到室温后可以获得约84%簇条状铁素体和约16%的残留奥氏体组织。
短句来源
     Under rapid cooling rate, lathy ferrite will be formed among the austenite dendrite branches, badly effect on the stainless steel microstructure and properties.
     铁素体数量与不锈钢的铬镍当量比率成正比关系,快速的冷却速度容易在奧素体枝晶间形成长条状铁素体,对不锈钢组织和性能产生不利影响;
短句来源
     The microstructures of isothermal treatment of 18CrNiWA steel at various austenitizing temperatures were investigated by means of optical and electron microscopes. It is found that within the whole range of intermediate-temperature both massive ferrite and lath ferrite (i.e. bainite ferrite) can be formed. These morphologies are different from each other.
     应用光学显微镜及电子显微镜对18 CrNiWA钢经不同温度奥氏体化及等温处理所得的组织进行了研究,发现该钢在整个中温转变温度范围内可同时存在块状铁素体及板条状铁素体(即贝氏体铁素体),这是两种不同类型的铁素体组织。
短句来源
     The transformation of the massive ferrite, besides the lath one, was observed in the low or medium carbon ahoy steels under middle temperatures.
     在低、中碳合金钢的中温区内,除板条状铁素体转变外还存在块状铁素体转变。
短句来源
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  banded ferrite
The combination treatment also provides a relatively homogeneous distribution of Mn in the banded (ferrite + pearlite) structure of hot rolled sheet.
      
Optical microscopy of etched samples revealed a banded ferrite-pearlite structure and the existence of forging folds near the change-in-section(160° fillets).
      
In the banded ferrite/pearlite structure, the carbon-bearing phase (pearlite) is distributed in layers whereas in the other structures the carbon-bearing phases are much more evenly distributed.
      
Mechanical properties of a marine shaft steel with banded ferrite-pearlite structure
      
The structure before annealing was either banded ferrite-pearlite, homogenized ferrite-pearlite, lath martensite, spheroidal cementite dispersed in ferrite, or austenite.
      
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  其他


The microstructures of isothermal treatment of 18CrNiWA steel at various austenitizing temperatures were investigated by means of optical and electron microscopes. It is found that within the whole range of intermediate-temperature both massive ferrite and lath ferrite (i.e. bainite ferrite) can be formed. These morphologies are different from each other. It is shown that raising isothermal temperature or lowering austenitizing temperature would favour the formation of massive ferrite, while converse conditions...

The microstructures of isothermal treatment of 18CrNiWA steel at various austenitizing temperatures were investigated by means of optical and electron microscopes. It is found that within the whole range of intermediate-temperature both massive ferrite and lath ferrite (i.e. bainite ferrite) can be formed. These morphologies are different from each other. It is shown that raising isothermal temperature or lowering austenitizing temperature would favour the formation of massive ferrite, while converse conditions would promote the formation of lath ferrite. The massive ferrite of intermediate-temperature transformation has some characteristics:(1)There is no surface relief.(2)The massive ferrite of which three-dimension appearance is equiaxed or irregular has its chunky substructures with higher density of dislocations.(3)It nucleates simultaneously both in in tragranularity and in grain boundaries.(4)It grows across the grain boundaries of parent phase or the twin, the trace of austenite boundary being preserved, but there is not any inheritance of twin structure.(5)In the massive ferrite formed at higher temperature, some island constituents are often enveloped by massive ferrite without the precipitation of carbides. The carbon concentration of the former is much higher than the initial average concentration in steel. In the massive ferrite formed at lower temperature, carbides precipitate with the morphology like Widmanstatten structure. The four characteristics of phase transformation mentioned above(1)-(4)are similar to those of massive transformation. It is newly considered that the r→a transformation of the short range diffusion of iron atoms accompanied by a long range diffusion of carbon atoms may result in the formation of massive ferrite of intermediate-temperature.

应用光学显微镜及电子显微镜对18 CrNiWA钢经不同温度奥氏体化及等温处理所得的组织进行了研究,发现该钢在整个中温转变温度范围内可同时存在块状铁素体及板条状铁素体(即贝氏体铁素体),这是两种不同类型的铁素体组织。提高等温温度或降低奥氏体化温度有利于块状铁素体形成;反之有利于贝氏体铁素体转变;并得出这种中温块状铁素体具有以下的相变特征:(1)无浮凸效应。(2)三维形态呈等抽状或不规则的外形,它是由高密度位错的块状亚结构所组成。(3)可同时在晶内和晶界形核。(4)能跨越原晶界或孪晶界而生长,并仍保留原奥氏体晶界的痕迹,但不继承孪晶组织。(5)形成温度较高时,得到无碳化物析出的块状铁素体包围着的岛状组织,后者含碳量远高于原始的平均成份;形成温度较低时,在块状铁素体中可析出单向或多向分布的碳化物。上述(1)~(4)四种相变特征与块状转变相类似。我们初步认为这种中温块状铁素体的形成是铁原子短程扩散的γ→α转变与碳原子长程扩散的综合结果。

The transformation of the massive ferrite, besides the lath one, was observed in the low or medium carbon ahoy steels under middle temperatures. The massive ferrite consiste of densely dislocated substructural chunks, which are equi-axial or irregular on three dimensional morphology. They nucleate and grow noncoherently either in the interior or along the boundary of grains. No definite orientation,namely neither habit plane nor growth orientation, was found during γ→a transformation. The carbides of different...

The transformation of the massive ferrite, besides the lath one, was observed in the low or medium carbon ahoy steels under middle temperatures. The massive ferrite consiste of densely dislocated substructural chunks, which are equi-axial or irregular on three dimensional morphology. They nucleate and grow noncoherently either in the interior or along the boundary of grains. No definite orientation,namely neither habit plane nor growth orientation, was found during γ→a transformation. The carbides of different arrangements which exist certain orientations and habit planes may be presented in the chunks with the decreasing growth temperature. Some island constituents rich in carbon which is composed of twinned martensite or martensite with retained austenite at room temperature may be also formed in or at the massive ferrite chunks or along the grain boundaries. The two above-mentioned orientations between the martensite and matrix are the relationship of K-S and N-W. It seems to be considered that the formation of middle temperature massive ferrite may be resulted by the γ→α transformation of a short range diffusion of Fe atoms accompanied with a long range diffusion in the way of island rich in carbon or carbide as well

在低、中碳合金钢的中温区内,除板条状铁素体转变外还存在块状铁素体转变。中温块状铁素体的三维形态呈不规则的或等轴的块状,系由较高密度位错的块状亚结构所组成,它可在晶内或晶界形核,非共格长大。在相变时,γ/α间不具有固定的位向关系、惯析面与长大取向。随着形成温度的降低,在块内可出现不同分布方式的碳化物,它们与基体间各具有一定的位向关系和惯析面。在块内、块间或沿晶界可形成富碳的岛状组织,常温下它是由M或M+A所组成,其中马氏体与母相间有K-S和N-W位向关系。初步认为,中温块状铁素体组织的形成是铁原子短程扩散的γ→α转变与碳原子长程扩散并以富碳岛状组织或碳化物的方式出现的综合结果。

The process of deformation and crack initiation of high temper (550℃) medium-carbon steel 40Mn has been investigated using smooth tensile specimens. The midgage length part of the specimen was spark cut into 0.3mm thick sheets. The direct transmission observation of thin foil specimens was carried out on TEM. The evolution of the dislocation structure with elongation in the steel of hardened and tempered condition was studied. In the lath ferrite, the feature of dislocation structure is irregular network. At...

The process of deformation and crack initiation of high temper (550℃) medium-carbon steel 40Mn has been investigated using smooth tensile specimens. The midgage length part of the specimen was spark cut into 0.3mm thick sheets. The direct transmission observation of thin foil specimens was carried out on TEM. The evolution of the dislocation structure with elongation in the steel of hardened and tempered condition was studied. In the lath ferrite, the feature of dislocation structure is irregular network. At the stage of comparatively small elongation (δ=0.2-2.7%), near the interface of ferrites and the ferrite-cementite interface, regular dislocation networks appear and the dislocation density increases. At the deformation stage of δ=4.7%, the dislocations tangle and desify. At the deformation stage of δ=6.8-10%, the feature of dislocation structure becomes elongated dislocation cells. The crack nucleation in hardened and tempered steel has been observed by SEM and optical microscope. When the deformation attains δ=4.7%, the submicroscopic cracks are initiated at interface of metal matrix and inclusion. At the deformation stage of δ=6.8%, the submicrocrack initiated at interface of lath ferrites and interface of ferritecementite. The submicroscopic crack propagated through the formation and joining up of void groups.

本文应用金属薄膜试样的透射电子显微镜的分析方法,以及扫描电镜和光学显微镜的分析方法,研究调质状态40Mn钢拉伸加载过程变形度对位错结构和裂纹萌生的影响。条状铁素体和渗碳体试样在拉伸加载过程中随延伸率δ的增加,铁素体中的位错网很快演变为高密度的位错缠结和拉长的位错胞。显微组织特征直接影响裂纹的萌生部位。微孔往往在铁素体与渗碳体的界面处和条状铁素体间的边界处萌生,开裂的早期阶段主要是形成微孔群。

 
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