搜索结果: 61-75 共查到“知识库 金属学”相关记录439条 . 查询时间(3.148 秒)
Effect of carbon content upon the early stage of tempering of steel with Mn and V addition
Metallic alloys Dilatometric method Tempering ε carbide
<
2009/12/1
Purpose: In this paper the effect of carbon content on the transformations taking place at the early stage of tempering
(precipitation of the ε carbide) of the model alloys with manganese and vanadiu...
Microstructural evolution in a duplex cast steel after quench ageing process
Casting Heat treatment Quench ageing
<
2009/12/1
Purpose: The effectiveness and usefulness of the quench ageing on the service properties of massive duplex cast
steel was presented in this work. The mechanism of precipitation of a ε-Cu phase and i...
Microstructure and behaviour of ZC63 alloy and composite
Metallic alloys Magnesium alloys Non-destructive testing
<
2009/12/1
Purpose: of this paper is to study the damping behaviour of ZC63 magnesium alloy and the same alloy reinforced
with short Saffil fibres.
Design/methodology/approach: Samples were thermally cycled be...
Calculation of phase equilibrium in Fe-B-C-O system
Calculation Phase equilibrium Fe-B-C-O system
<
2009/12/1
Purpose: This paper presents calculation of phase equilibrium in Fe-B-C-O system.
Design/methodology/approach: The typical phase equilibrium diagrams do not always provide useful
information on this...
Relationship between stream forces and parameters of the powder injection into metal bath
Metallic alloys Casting Pneumatic conveying Powder injection
<
2009/12/1
Purpose: The pneumatic method of introduction of various powders into ladle or metallurgical furnaces is use
because of its many advantages. There are no problems with use of injection lances in elec...
Effect of temperature on tensile fracture mechanisms of a Ni-base superalloy
Fracture mechanics Ni-base superalloy GTD-111 Tensile test Fractography
<
2009/12/1
Purpose: The Ni-base superalloy GTD-111 is used in manufacturing of the first stage blades of powerful gas
turbines (over 125MW). The alloy posses appropriate microstructure and high temperature prop...
[011]取向镍基单晶合蠕变特征
[011]取向镍基单晶合 拉伸蠕变 位错
<
2009/11/30
研究了一种[011]取向镍基单晶合金的拉伸蠕变特征及其变形期间的微观组织结构. 结果表明: 在750 ℃/680 MPa条件下, 合金的初期蠕变和稳态蠕变速率相对较高, 蠕变寿命较短. TEM观察显示, 蠕变期间的变形特征是1/2<110>位错在基体中运动, 发生反应形成1/3<112>超 Shockley不全位错切入γ´相后产生层错; 在870 ℃/500 MPa条件下, 蠕变中期出...
恒定磁场作用下Al-Pb合金快速定向凝固
Al-Pb合金 凝固 磁场
<
2009/11/30
在恒定磁场作用下对Al--Pb合金进行了快速定向凝固实验, 考察了磁场强度对凝固组织的影响, 分析了磁场的作用机理. 结果表明, 恒定磁场能显著减弱熔体对流, 提高凝固界面前沿液--液相变过程的空间均匀性, 减缓液滴的碰撞凝并速度, 使凝固试样中的弥散相粒子最大和平均尺寸减小, 粒子尺寸分布范围变窄, 有助于获得弥散型偏晶合金凝固组织.
微粒子喷丸中碳钢疲劳性能分析
中碳钢 微粒子喷丸 应力松弛
<
2009/11/30
使用旋转弯曲疲劳试验机进行了中碳钢109 cyc的疲劳实验, 分析了直径100μm的钢球和陶瓷球喷丸处理后材料的疲劳性能及实验过程中残余应力的稳定性. 与未喷丸试样相比, 2种微粒子喷丸试样的疲劳极限分别提高了35%和23%. 根据实验过程中对残余应力的跟踪测试, 详细分析了残余应力松弛的过程及机理, 阐述了疲劳极限提高机理及其控制因素.
一种镍基单晶高温合金的蠕变各向异性
镍基单晶高温合金 蠕变 各向异性
<
2009/11/30
分别制备了[001]和[011]取向的Ni-Co-Cr-Mo-W-Al-Ti-Ta镍基单晶高温合金试样. 在 750 ℃/750 MPa条件下, [001]取向合金的平均蠕变寿命明显高于[011]取向合金, [011]取向合金延伸率稍高. 在982 ℃/248 MPa条件下, [001]取向合金的平均蠕变寿命和延伸率均高于[011] 取向合金, 各向异性主要表现在加速蠕变阶段, 但各向异性程度比低...
激光熔凝温度场的数值计算
激光熔凝 熔池 温度场 点源法
<
2009/10/28
利用激光圆形光斑时祢性的特点，建立丁激光表面快速熔凝条件下温度场的： 维数值模型。
边界条件用点源模型推导，同时采用SIMPLE算法进行计算。在保证精度的条件下简化了计算(相对于三维)。计算结果与实验结果吻舍良好，表明这种算法在一定条件下能够准确地反映激光表面熔凝过程中，熔池纵截面的温度场信息及激光重熔过程中生长界面的形态。
The influence of alloying elements in aluminium on the grain refinement with ALTI5B1
aluminium casting solidification
<
2009/10/23
This work deals with the influence of alloying elements in aluminium on the grain refinement with various additions of AlTi5B1. Grain-refinement tests were made at a cooling rate of 15 °C/s. The resul...
Possibility of determining steel grain size using ultrasonic waves
steel microstructure ultrasonic wave
<
2009/10/23
Properties of steel depend also on its internal structure. In practice, one can distinguish between primary structure (obtained during solidification) and secondary structure (being a result of the γ ...
CENTRELINE FORMATION OF Nb(C, N) EUTECTIC IN STRUCTURAL STEEL
structural steel heavy plates through thickness reduction of area
<
2009/10/23
The reduction of area in the through thickness direction is an essential mechanical property of thick steel heavy
plates. By a routine control, a very small through thickness reduction of area was fo...