搜索结果: 1-15 共查到“工学 ECAP”相关记录23条 . 查询时间(0.062 秒)
连续柱状晶Cu-ECAP中的晶界演变及其与剪切带的交互作用
连续柱状晶Cu 等通道转角挤压 晶界演变 剪切行为
2019/11/5
金属发生塑性变形时形成的剪切带在高应变状态下会被分割为孪晶-基体片层状组织,而纳米尺度的孪晶界能实现材料强塑性的高度匹配。因此,利用等通道转角挤压(ECAP)技术研究剪切带的形成与作用可为材料的强塑性匹配提供有效支持。通过对具有特殊晶界角度的连续柱状晶纯Cu进行1道次ECAP变形,研究变形过程中晶界的演变,分析变形过程中剪切带的形成机制及与晶界的交互作用,测试了不同晶界角度试样变形后的力学性能。结...
室温ECAP变形对T250马氏体时效钢组织和性能的影响
等径弯曲通道变形 马氏体时效钢 时效处理
2014/12/19
研究等径弯曲通道变形(ECAP)过程中T250马氏体时效钢的组织变化规律,以及后续时效处理过程中,时效时间对硬度的影响.采用ECAP工艺对T250马氏体时效钢进行C方式2道次室温变形,并对原始试样和ECAP变形试样进行480℃/(15~480min)的时效处理.结果表明,随着ECAP道次的增加,材料x面的组织由较均匀整齐的板条状马氏体变成弯曲杂乱的马氏体,且在马氏体上出现位错胞和亚晶,y面则是马氏...
在室温下以等径弯曲通道变形(ECAP)技术制备超细晶工业纯钛,利用光学显微镜(OM)和透射电子显微镜(TEM)研究室温ECAP变形纯钛微观组织演变过程,并讨论纯钛室温ECAP变形的显微组织演化机制。结果表明:显微组织演化分为3个不同阶段,分别对应3种不同机制:第一阶段在真应变ε≤1.27时,为位错滑移和孪生交互作用细化机制,形成含有高密度位错和孪晶的板条状组织;第二阶段在真应变量1.27<ε<
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在500℃采用C方式ECAP变形制备了亚微晶45钢, 用光学显微镜(OM)、透射电子显微镜(TEM)和电子衍射(SAED)等分析技术对其进行表征, 研究了铁素体组织的演变特征和晶粒细化机制。结果表明: 在初始变形道次后, 原始的粗大铁素体晶粒因剧烈剪切变形而沿着剪切变形的方向形成剪切变形带, 在其内大量的具有亚微米尺寸的板条状位错胞或亚晶使铁素体晶粒显著细化。进一步变形使板条状位错胞或亚晶组织继续...
ECAP methods application on selected non-ferrous metals and alloys
Metallic alloys ECAP method Mechanical properties Microstructure
2010/8/17
In many technical processes of forming the deformation is substantially greater than conditions at the tensile test. In this case a torsion tests have already been used for a long time at investigatio...
Microstructure and properties of α + β brass after ECAP processing
ECAP Severe plastic deformation Ultra-fine grained materials
2010/1/11
Purpose of this paper is to determine the effect of Equal Channel Angular Pressing (ECAP) processing on the microstructure and hardness of α+β brasses. The effect of deformation temperature an...
Influence of change of direction of deformation at ECAP technology on achieved UFG in AlMn1Cu alloy
Plastic Forming ECAP process of AlMn1Cu alloy Structure analysis
2009/12/14
Purpose: of this paper is to extend a complex evaluation of aluminium alloy, which requires very often knowledge of behaviour of deformation at the ECAP process and achieved strengthening, intensity o...
Influence of severe plastic deformation by the ECAP method on structure and properties of the P2-04BCh steel
Nanomaterials Low-carbon steel ECAE deformation
2009/12/3
Purpose: Maim aim of this paper is to describe the plastic deformation executed by ECAE of low carbon steel. The ECAE method lead to significant improvement of strength of investigated material.
Desi...
Increase of efficiency of the ECAP technology at grain refinement of the alloy AlMn1Cu
ECAP process Mathematical simulation Channel geometry
2009/12/2
Purpose: The foundation of the resolved problem consists of verification of influence of temperature and also
geometry of the ECAP tool on obtaining of required amount of deformation which substantia...
Purpose: Main aim of this paper is to describe the plastic deformation executed by ECAP on low cycle fatigue
of steel AISI 316. Among others was attention fixed on mechanical properties after this tr...
Influence of ECAP technology on the metal structures and properties
Nanomaterials ECAP Microstructure Mechanical properties
2009/12/1
Purpose: The purpose of the paper is the verification of functionality of the ECAP technology at extrusion of the
copper, alluminium alloys, magnesium alloys and steel.
Design/methodology/approach: ...
Using severe plastic deformation to prepare of ultra fine - grained materials by ECAP method
Severe plastic deformation Die geometry Microstructures analyse
2009/12/1
Purpose: The purpose of the paper is to design a tool and propose a procedure for verification of development
of structure at equal channel angular pressing. The goal is to obtain after extrusion th...
ECAP变形下304L奥氏体不锈钢的形变诱导马氏体相变
奥氏体不锈钢 等通道转角挤压 亚微米晶
2009/10/15
研究了304L奥氏体不锈钢在严重塑性变形(等通道转角挤压, ECAP)下发生形变诱导马氏体转变的微观特征, 包括形核特征、长大方式和相变晶体学, 探讨了粗大晶粒和亚微米晶粒发生马氏体相变的异同和微观机理. 结果表明: 粗大奥氏体晶粒发生相变时, 马氏体主要形核于微观剪切带(包括层错、变形孪晶和ε相等)的相互交割处, 马氏体与奥氏体之间为K---S(Kurduumov---Sachs)关系, 而不是...
ECAP对纯铝拉伸性能和断裂行为影响的研究
等通道转角挤压(ECAP) 位错 断裂机制
2013/10/8
利用等通道转角挤压(ECAP)对纯铝进行了连续的挤压,结合位错及断口形貌,分析了位错强化及断裂机制.结果表明,剪切变形使位错滑移,晶粒细化,挤压4道次后材料屈服强度、抗拉强度分别较初始态提高了38.5%和24.0%,断裂机制呈现典型的沿晶断裂特征.