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冲击疲劳
相关语句
  impact fatigue
    Study on strength,ductility,toughness,and resistance of impact fatigue of cold forming steels
    冷变形工模具钢强度、塑性、韧性及冲击疲劳抗力的研究
短句来源
    The Feature of Fracture at Initial Region and Mechanism of Crack Initiation under Repeated Impact Fatigue Load for 300M Steel
    300M钢冲击疲劳断口起裂部位宏观特征和裂纹萌生机制
短句来源
    THE INFLUENCE OF MICROSTRUCTURE ON IMPACT FATIGUE CRACK INITIATION LIFE OF 40CrNi2Si2MoVA STEEL
    40CrNi2Si2MoVA钢的显微组织对其冲击疲劳裂纹起始寿命的影响
短句来源
    Inquiry of Impact Fatigue Life Estimation for Roller Conveyer at the Blooming-Shabbing of Baoshan Iron &. Steel Complex
    宝钢初轧厂工作辊道冲击疲劳寿命估算
短句来源
    The investigation on impact fatigue wear of low-alloy steel
    低合金钢的冲击疲劳磨损
短句来源
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  shock fatigue
    Thermal Shock Fatigue Behavior of Ceramets Containing 20% Nickel
    含20%Ni金属基陶瓷的热冲击疲劳
短句来源
    Formative Mechanism of Thermal Shock Fatigue Crack of Cemented Carbide YG8
    YG8硬质合金热冲击疲劳裂纹的萌生机制
短句来源
    FORMATIVE MECHANISM OF THERMAL SHOCK FATIGUE CRACK OF CERMETS
    金属陶瓷热冲击疲劳裂纹形成机制
短句来源
    Formation Mechanism of Thermal Shock Fatigue Crack of Cemented Carbide YG10
    YG10硬质合金热冲击疲劳裂纹形成机制
短句来源
    The formative mechanism of thermal shock fatigue crack of cemented carbide YG8 has been investigated.
    研究了YG8硬质合金热冲击疲劳裂纹的萌生机制。
短句来源
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  impact-fatigue
    Application of Impact-fatigue Test to High Chromium Cast Iron
    冲击疲劳试验在高铬铸铁研究中的应用
短句来源
    The procedures for determining the fatigue crack initiation life and the crack propagation rates by using the impact-fatigue testing set were proposed,and the expression for correlation between the impact energy and the stress intension factor range,ΔK,was developed in the present study.
    提出了利用冲击疲劳试验机测定疲劳裂纹起始寿命和裂纹扩展速率的原理和方法,建立了应力强度因子范围△K 与冲击能之间的定量表达式。
短句来源
    Experimental Study on Impact-Fatigue Life of Commercial Low Alloy Steels' Weld
    常用低合金钢焊接接头冲击疲劳寿命的试验研究
短句来源
    On thecontrary, the repeated impact-fatigue properties decrease because of the large possibility ofthe initiating of micro-cracks and the short distance of the propagation of cracks.
    但是组织中碳化物数量越多、分布越弥散,在基体和碳化物的界面上形成微孔洞和微裂纹的几率越大,且裂纹扩展距离越短,所以高铬铸铁抗冲击疲劳能力随着二次保温温度的提高逐渐下降。
短句来源
    And when holding in the range of 3 hours,precipitated secondary carbides will agglutinate, causing a drop in hardness of the samplesand an increase in the repeated impact-fatigue properties.
    继续延长二次保温时间(3~6h之内),由于组织中已析出的二次碳化物不断聚集长大,二次碳化物的间距变大,强化效果变弱,故硬度逐渐下降,而抗冲击疲劳能力出现升高趋势;
短句来源
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  “冲击疲劳”译为未确定词的双语例句
    Effect of Rare Earth Elements on Impact Fatique Resistance of ZG60CrMnSiMo
    稀土对ZG60CrMnSiMo钢冲击疲劳抗力的影响
短句来源
    Laser melting experiments were carried out on the CO_2 laser(HGL—90),the repeated impact experiments were carried out on self making repeated impact machine.
    在HGL—90型5kw横流CO_2激光器上进行熔覆加工,并在自制的多冲碰撞疲劳试验机上进行多次冲击疲劳试验。
短句来源
    The overload retardation effects on crack propagation in impact and non-impact fa-tigue in low carbon alloy steel 12CrNi3A were studied.
    对12CrNi3A 钢在冲击和非冲击疲劳栽荷下的过载裂纹扩展延迟效应研究表明:过载对随后裂纹扩展的影响不仅取决于过载力作用下的裂尖塑变,还取决于随后基载力作用下的裂尖塑变.
短句来源
    Cract propagation in impact and non-impact fatigue test were studied using a low carbon steel 10~# and 45CrNi alloy steel in different heat-treatment conditions.
    本文对10~#钢和45CrNi合金钢的几种组织状态分别进行了冲击疲劳及非冲击疲劳裂纹扩展试验,结果表明:45CrNi的组织状态对冲击疲劳裂纹扩展的影响较对非冲击疲劳的大;
短句来源
    EFFECTS OF OVERLOAD ON CRACK PROPAGATION BEHAVIOUR IN IMPACT AND NON-IMPACT FATIGUE
    冲击和非冲击疲劳载荷下过载对裂纹扩展的影响
短句来源
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  impact fatigue
AISI 4615 steel differential gears were plasma carburized at 1040 °C for performance tests to determine whether the more rapid carburization at the higher temperature would have any deleterious effect on impact fatigue life.
      
Static and impact fatigue behaviour of borosilicate glass
      
Impact fatigue study was conducted in an improved pendulum type repeated impact apparatus specially designed and fabricated for determining single and repeated impact strength.
      
Using a square waveform as applicable to the present impact tests and fracture mechanics interpretation, the number of cycles to failure during impact fatigue tests were predicted from quasi-static fatigue measurements.
      
Impact fatigue behaviour of carbon fibre-reinforced vinylester resin composites
      
更多          
  shock fatigue
Single-quench thermal shock and thermal shock fatigue tests were performed in a room-temperature distilled water bath on glass microscope slides.
      
An exploratory investigation of cumulative shock fatigue
      
  impact-fatigue
Impact-fatigue behaviour of unidirectional carbon fibre reinforced polyetherimide (PEI) composites
      
Effect of structurally-free ferrite in the core on the impact-fatigue strength of carburized steels
      
Effect of retained austenite on the impact-fatigue strength of steel
      
1.The effect of retained austenite on the impact-fatigue strength of steel depends on the acting stresses.
      
At a high stress level, when machine parts have a short service life, retained austenite increases the impact-fatigue resistance, but decreases it at low stresses.
      
更多          


In present work, the influence of three diffsre.it microstructures on the mechanical properties and the fractures of the marteasite type α-β titanium alloy, Ti-6.5Al-3.5Mo-2Zr-0.3Si, was investigated. These three types of microstructures are the equiaxed structure with the volume fraction of equiaxed a about 50%; the mixed structure, consisting of the nearly equiaxed a and the distorted acicular a morphology ;and the lamellar structure which consists of Widmanstatten and grain boundary α. It was found that the...

In present work, the influence of three diffsre.it microstructures on the mechanical properties and the fractures of the marteasite type α-β titanium alloy, Ti-6.5Al-3.5Mo-2Zr-0.3Si, was investigated. These three types of microstructures are the equiaxed structure with the volume fraction of equiaxed a about 50%; the mixed structure, consisting of the nearly equiaxed a and the distorted acicular a morphology ;and the lamellar structure which consists of Widmanstatten and grain boundary α. It was found that the tensile, impact, high cycle fatigue and the room temperature tensile properties after prolonged exposure at 500℃ of the equiaxed structure are superior to those of the mixed and lamellar structures. The highest stress-rupture and creep strength were obtained in the mixed structure which appeared to have a better combination of the properties than the others. The scanning electron fractographs showed that the dimple patterns were observed in the materials with equiaxed and mixed structures. The fractures of the material with the lamellar structure were characterized as the intergranular fracture with the mechanism of microvoid coalescence.

本工作对比研究了一个马氏体型α-β钛合金(Ti-6.5Al-3.5Mo-2Zr-0.3Si)三种类型退火组织的机械性能和电子断口相的特征。这三种类型的组织是:等轴组织(等轴初生α体积分数在50%左右)、混合组织(由接近等轴的α颗粒和歪扭的片状α交替排列的组织)和片状组织(片状α+β的魏氏组织+晶界α)。发现在拉伸、冲击、疲劳、500℃长时热暴露后的室温拉伸性能等方面,等轴组织优于另外两种组织,而在500℃的持久强度和蠕变强度方面,则混合组织优于其它两种组织。混合组织具有较好的综合性能。等轴组织和混合组织的电子断口相的特征是初窝,片状组织的断裂特征则为微孔聚合型的晶间断裂。

The behavior and mechanism of the tempered martensite embrittlement(TME) of an ultra-high strength steel 30CrMnSiNi2A, subjected to oil quench-ing from 900℃ and tempering at various temperatures below 600℃, arestudied in this paper. The experiments carried out include determination ofmechanical properties, measurement of quantities of retained austenite, examina-tion of microstructures, and fraetographies. The results are summarized asfollows: 1. TME is observed in the 30CrMnSiNi2A steel oil quenched and tem-pered....

The behavior and mechanism of the tempered martensite embrittlement(TME) of an ultra-high strength steel 30CrMnSiNi2A, subjected to oil quench-ing from 900℃ and tempering at various temperatures below 600℃, arestudied in this paper. The experiments carried out include determination ofmechanical properties, measurement of quantities of retained austenite, examina-tion of microstructures, and fraetographies. The results are summarized asfollows: 1. TME is observed in the 30CrMnSiNi2A steel oil quenched and tem-pered. The behavior of TME is markedly affected by straining rate, and thisis attributable to different embrittlement machanisms. 2. At high rate of strain (i.e. impact test with Mesnager U-notch speci-men), the impact toughness decreases in the tempering temperature range of350-550℃. The minimum value of impact toughness is observed at about 450℃.Therefore, it may be called 450℃ embrittlement. This embrittlement is mainlyattributed to noncontinuous precipitation of cementite formed by the decomposi-tion of retained austenite films at the boundaries of martensite laths or aroundthe M/A island structures. In this case, the fractograph looks like a mixturetype of transgranular quasi-cleavage and dimple. 3. At lower rate of strain (i. e. the plane strain fracture toughness testand the impact-fatigue test), the fracture toughness and impact-fatigue lifedecrease in the tempering temperature range of_300-400℃. The minimum valuesof these are observed at about 350℃. Therefore, it may be called 350℃ embrit-tlement. This embrittlement is mainly attributed to decreasing mechanical sta-bility of retained austenite, which in turn greatly favours the formation ofhigh carbon content martensite located in interlaths during plastic strain. In this case, the crack propagates mostly along the lath boundaries and seldomthrough the laths. 4. Increasing the mechanical stability of retained austenite is one im-portant way to improve the combination of strength and toughness of 30CrMn-SiNi2A steel subjected to low tempering temperature. The mechanical stabilityof retained austenite can be controlled by tempering. Consequently, this resultprovides a general theoretical basis for laying down tempering temperature ofother ultra-high strength steel. The experiment indicates that optimum combination of strength, toughnessand impact-fatigue life for 30CrMnSiNi2A steel can be obtained through oilquenching and tempering at about 250℃. This result is attributed to the highestmechanical stability of its retained austenite.

本文研究了超高强度钢30CrMnSiNi2A的回火马氏体脆性(以下简称TME)及与之有关的机械性能,结果表明:该钢TME的表现行为随着加载条件的不同而异。在高速加载条件下,即冲击韧性试验时,TME发生在350~550℃回火温度区间;在低速加载条件下,即静态断裂韧性或冲击疲劳试验时,TME发生在300~400℃回火温度区间。通过在适当温度(200~300℃)回火,可提高其残余奥氏体γ_R的机械稳定性,从而获得良好的强韧化效果。实践证明,在250℃附近回火可获得强度、韧性和冲击疲劳寿命的最佳配合。

The continuous cooling transformation curve for 18Cr2Ni4WA steel hasbeen experimentally determined. The relationships between microstructures--obtained under different cooling rates with optical and electron microscope--andmechanical properties have been studied. The following conclusions may be drawn: (1) Microstructures and mechanical properties of the steel are controlledby cooling rate. Lath martensite, mixture martensite and bainite, bainite oreven all granular bainite have been obtained respectively under...

The continuous cooling transformation curve for 18Cr2Ni4WA steel hasbeen experimentally determined. The relationships between microstructures--obtained under different cooling rates with optical and electron microscope--andmechanical properties have been studied. The following conclusions may be drawn: (1) Microstructures and mechanical properties of the steel are controlledby cooling rate. Lath martensite, mixture martensite and bainite, bainite oreven all granular bainite have been obtained respectively under different cool-ing rates. Martensite/retained austenite (M/A) island of certain amount andsizes are found in different microstructures stated above. (2) When the coolig time is about an hour from 900℃ to 270℃ the mainmicrostructure of steel is granular bainite and its overall properties are betterthan others. Compared with oil quenching, impact toughness a_k is increased by37%; fracture toughness J_(0.05), 105%; rotating beam fatigue limit σ_(-1), 5%;impact fatigue life N_f, 33%; and crack propagation rate da/dN is lower. Butthe strength σ_b of 120 kg/mm~2 can still be assured (tempering temperature220℃). Therefore this quenching regime is the best one. (3) (M/A) islands of certain amount and sizes in microstructure canretard crack propagation effectively. According to this paper's experiments therelationship among impact fatigue life (N_f), diameter (D) of (M/A) islandand mean distance (λ) between (M/A) islands can be expressed by: Nf= 1/λ~(1.166)(λ-D)~0.213 (4) The relationship between fracture toughness K_(10), other mechanicalproperties and mean distance (λ) between (M/A) islands can be expressed by: K_(10)=2π/3·ε_f·E·σ_b·e~(n_2ψ)·λ (1/2)

本文测定了18Cr2Ni4WA钢奥氏体连续冷却转变曲线,分析了不同冷速下的显微组织,研究了冲击疲劳、旋转弯曲疲劳、断裂韧性和常规机械性能,讨论了组织和性能的关系。结果表明:该钢的显微组织依冷速不同可分别获得板条马氏体、板条马氏体和贝氏体、贝氏体、以至全部为粒状贝氏体。冷却时间约一小时得到以粒状贝氏体为主的组织,其综合机械性能优于其他组织。不同冷速的组织中均存在一定数量和尺寸的(M/A)岛,对疲劳裂纹扩展有阻碍作用,可提高疲劳寿命。

 
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