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Retained austenite in the cracking process of 70MnCrMoV9-2-4-2 tempered steel
Tool materials Fracture toughness Retained austenite
2010/2/4
Purpose: The aim of this study was a review of opinions molded within last 35 years on a part of steel cracking process played by retained austenite.Design/methodology/approach: Dependencies between v...
Microstructure, properties and hot deformability of the new maraging steels
Metallic alloys Maraging steels Mechanical properties
2010/2/4
Purpose: The effects of relevant metallurgical factors on the structure, fracture mode and properties of the high cobalt and cobalt free maraging steel has been studied. The aim was to better understa...
The structure of austenitic steel AISI 316 after ECAP and low-cycle fatigue
Structure Low-cycle fatigue Steel AISI 316
2010/2/4
Purpose: The article presents results of investigation of structure and properties of austenitic steel grade AISI 316 after application of Equal Channel Angular Pressing (ECAP) at the temperature of a...
蒸发淀积Al和Teflon AF薄膜间的相互作用
Al Teflon AF 相互作用 X-射线光电子光谱
2008/6/26
通过X-射线光电子光谱(XPS),研究了蒸发淀积Al与Teflon AF薄膜间的相互作用.高分辨率Al2p,Ols,Cls和Fls XPS光谱分析表明在Al和Teflon AF界面处有AI的氟化物(AlxFy)以及C-O-Al有机化合物的形成.考虑到蒸发淀积Al前后,CF3基团降低和CF2基团增加,可以认为AlxFy中氟的来源主要是由于CF3基团中一个C-F键断裂而失去的氟原子,同时产生的CF2游...
用直流磁控溅射方法制备了性能优良的以(Ni0.81Fe0.19)1-xCrx为种子层的Ni0.81Fe0.19薄膜, 研究了种子层成分及最大限度度对薄膜磁性和微结构的影响, 结果表明: 当种子层(Ni0.81Fe0.19)0.63Cr0.37厚度为5.5 nm时, Ni0.81Fe0.19(20.0 nm)薄膜的各向异性磁电阻(AMR)值为(2.53±0.06)%; 当Cr的含量为0.36时, ...
The microstructure and properties of the new bainitic rail steels
Metallic alloys Rail steels Mechanical properties CCT diagrams
2010/2/8
Purpose: The aim of this research was presentation of the Continuous Cooling Transformations (CCT) diagrams and mechanical properties of two new bainite rail steels with working names RB370 and RB390....
纳米金属微粒二元相图的尺寸效应和形状效应
纳米微粒 二元相图 形状因子
2008/5/6
通过考虑相图计算公式中基本参数------熔化温度和熔化焓的尺寸效应与形状效应, 研究了完全互溶的二元纳米金属微粒系统理想溶液的相图。研究结果表明, 纳米微粒的相图也依赖于微粒的尺寸和形状因子。 对Cr--Mo纳米微粒系统相图的计算结果表明，纳米微粒相图的固相线和液相线要比相应块体材料的固相线和液相线低，但与已报道的结果不同的是，固、液相线变化的幅度基本相同。这与本文目前不仅考虑了纳米微粒熔化温...
Microstructure and properties of vacuum melted high cobalt and cobalt-free maraging steels
Metallic alloys Maraging steels Mechanical properties
2010/2/8
Purpose: Steel cleanliness, microstructure and fracture mode have been studied, with the aim of enhancing mechanical properties and toughness of the high cobalt and cobalt-free maraging steels.Design/...
Kinetics of the austenite formation during intercritical annealing
Heat treatment Soft and intercritical annealing Mn partitioning
2010/2/8
Purpose: of this paper is the effect of the microstructure of the 6Mn16 steel after soft annealing on the kinetics of the austenite formation during next intercritical annealing.
Design/methodology/a...
Surface roughness analyses on hard martensitic stainless steel by turning
Tool materials Machining Surface roughness
2010/2/8
Purpose: The purpose of this research paper was to analyze the surface roughness produced by turning process on hard martensitic stainless steel by Cubic Boron Nitride cutting tool. The work piece mat...
利用电脉冲技术首次实现快速升温马氏体相变
电脉冲技术
2008/1/17
最近，沈阳材料科学国家（联合）实验室固体原子像研究部隋曼龄研究组通过电脉冲技术在传统的Ti-6Al-4V合金中首次实现了快速升温马氏体相变。 众所周知，快速冷却（淬火）引发的马氏体相变（无扩散型切变）普遍地存在于包括钢在内的金属和非金属晶体、陶瓷、矿物、聚合物等材料中。这种淬火马氏体转变产物已经广泛地应用到医学和工业领域。从原则上讲，只要加热速率足够高以致于可以抑制与原子扩散运动相关联的相转变发生...
Strain-Concentration Factor of Notched Cylindrical Austenitic Stainless Steel Bar with Double Slant Circumferential U-Notches Under Static Tension
Austenitic stainless steel interference slanted notch
2010/1/14
The interference effect on the new strain-concentration factor (SNCF), defined under the triaxial stress state, is studied for
circumferentially notched cylindrical bars with double-slant notches und...
预置中间层的相变超塑性焊接新工艺及其接头组织
相变超塑性扩散焊接 中间层 低碳钢
2007/12/28
提出了一种新型焊接工艺——预置中间层的相变超塑性焊接工艺(TSBI), 工艺要求在待焊母材预置入中间层材料; 在循环加热时, 峰值温度须同时大于母材的相变温度及中间层的液相线. 实验以低碳钢为母材, 以镍基非晶为中间层. 实验规范为: 峰值温度1050℃, 下限温度400℃, 压力18 MPa, 循环次数15次. 接头的拉伸性能及组织测试表明, 新工艺具有界面无残留空洞、焊合率高、循环次数少、生产...
预变形对TiNi薄膜相变行为的影响
预变形 自适应马氏体 再取向马氏体
2007/12/28
用DSC法研究了预变形对TiNi薄膜相变行为的影响,结果表明,预变形可使马氏体逆相变温度升高,马氏体发生了稳定化.经过一次完全相变循环后,这种稳定化现象消失;若TiNi薄膜在预变形后先经过一次不完全逆相变,则其后的热循环中,除第一次相变循环的逆相变是由两个独立的相变过程共同完成,其他相变循环的逆相变过程相同于变形前的状态.由此可见,预变形造成的TiNi薄膜马氏体稳定化现象,经过完全相变循环后均可以...