Ultrafine grain and properties of alloy 36NKhTYu aged by the mechanism of intermittent precipitation

1977 ◽  
Vol 20 (5) ◽  
pp. 667-669
Author(s):  
V. F. Sukhovarov ◽  
R. D. Strokatov
Keyword(s):  
Ultrafine Grain ◽  
Intermittent Precipitation ◽  
Alloy 36Nkhtyu

scholarly journals Study on strong spinning preparation method and mechanism of the industrial pure titanium ultrafine crystallization

2019 ◽  
Vol 14 ◽  
pp. 155892501989525
Author(s):  
Yu Yang ◽  
Yanyan Jia
Keyword(s):  
Heat Treatment ◽  
High Performance ◽  
Pure Titanium ◽  
Grain Structure ◽  
Theoretical Research ◽  
Ultrafine Grain ◽  
Forming Process ◽  
Spinning Process ◽  
And Performance ◽  
Material Utilization

Ultrafine crystallization of industrial pure titanium allowed for higher tensile strength, corrosion resistance, and thermal stability and is therefore widely used in medical instrumentation, aerospace, and passenger vehicle manufacturing. However, the ultrafine crystallizing batch preparation of tubular industrial pure titanium is limited by the development of the spinning process and has remained at the theoretical research stage. In this article, the tubular TA2 industrial pure titanium was taken as the research object, and the ultrafine crystal forming process based on “5-pass strong spin-heat treatment-3 pass-spreading-heat treatment” was proposed. Based on the spinning process test, the ultimate thinning rate of the method is explored and the evolution of the surface microstructure was analyzed by metallographic microscope. The research suggests that the multi-pass, medium–small, and thinning amount of spinning causes the grain structure to be elongated in the axial and tangential directions, and then refined, and the axial fiber uniformity is improved. The research results have certain scientific significance for reducing the consumption of high-performance metals improving material utilization and performance, which also promote the development of ultrafine-grain metals’ preparation technology.

scholarly journals Facile route to bulk ultrafine-grain steels for high strength and ductility

Nature ◽  
2021 ◽  
Vol 590 (7845) ◽  
pp. 262-267
Author(s):  
Junheng Gao ◽  
Suihe Jiang ◽  
Huairuo Zhang ◽  
Yuhe Huang ◽  
Dikai Guan ◽  
...  
Keyword(s):  
High Strength ◽  
Ultrafine Grain ◽  
Strength And Ductility ◽  
Facile Route

Fracture and Fatigue Resistance of Ultrafine Grain CuCrZr Alloy Produced ECAP

2006 ◽  
Vol 503-504 ◽  
pp. 811-816 ◽  
Author(s):  
Alexei Vinogradov ◽  
Kazuo Kitagawa ◽  
V.I. Kopylov
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Stable Crack Growth ◽  
Ultrafine Grain ◽  
J Integral ◽  
Present Communication ◽  
Angular Pressing ◽  
Fatigue And Fracture ◽  
Anisotropy Of Mechanical Properties

Anisotropy of mechanical properties, fatigue and fracture resistance of precipitation hardened CuCrZr alloy ultrafine (UFG) grained by equal-channel angular pressing (ECAP) is in focus of the present communication. Fracture toughness was estimated in terms of J-integral and the fatigue crack growth rate was quantified. It was found that although the estimated JIC-value appeared lower than that reported in the literature for a reference alloy, the ductility, fracture and crack growth resistance remained satisfactory after ECAP while the tensile strength and fatigue limit improved considerably. The stable crack growth rate did not differ very much for ECAP and reference conventional CuCrZr and no remarkable anisotropy in the stable crack growth was noticed.

Ultrafine-grain formation and improved mechanical properties of novel extruded Ti-Fe-W alloys with complete solid solution of tungsten

2021 ◽  
Vol 875 ◽  
pp. 160031
Author(s):  
Abdollah Bahador ◽  
Junko Umeda ◽  
Ridvan Yamanoglu ◽  
Astuty Amrin ◽  
Abdulaziz Alhazaa ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Ultrafine Grain ◽  
Complete Solid Solution ◽  
Grain Formation

scholarly journals Comparison of ultrafine-grain isotropic graphite prepared from microcrystalline graphite and pitch coke

Fuel ◽  
2021 ◽  
Vol 290 ◽  
pp. 120055
Author(s):  
Zhao He ◽  
Jinliang Song ◽  
Zheng Wang ◽  
Xiaohui Guo ◽  
Zhanjun Liu ◽  
...  
Keyword(s):  
Ultrafine Grain ◽  
Pitch Coke ◽  
Isotropic Graphite

Strength and tension/compression asymmetry in nanostructured and ultrafine-grain metals

2003 ◽  
Vol 51 (15) ◽  
pp. 4505-4518 ◽  
Author(s):  
S. Cheng ◽  
J.A. Spencer ◽  
W.W. Milligan
Keyword(s):  
Ultrafine Grain ◽  
Tension Compression Asymmetry

scholarly journals Effect of Mechanical Surface Treatments on the Surface State and Passive Behavior of 304L Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 135
Author(s):  
Kathleen Jaffré ◽  
Benoît Ter-Ovanessian ◽  
Hiroshi Abe ◽  
Nicolas Mary ◽  
Bernard Normand ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Surface State ◽  
Electrochemical Impedance ◽  
Passive Films ◽  
Surface Finishing ◽  
Ultrafine Grain ◽  
304L Stainless Steel ◽  
Passive Behavior

The effect of dry grinding on 304L stainless steel’s passive behavior is compared to two other surface finishing (mechanical polishing down to 2400 with SiC emery paper and 1 µm with diamond paste, respectively). The characterization of the surface state was performed using scanning electron microscopy, transmission electron microscopy, 3D optical profilometer, and X-ray diffraction. Results indicate that each surface treatment leads to different surface states. The ground specimens present an ultrafine grain layer and a strong plastic deformation underneath the surface, while an ultrafine grain layer characterizes the subsurface of the polished specimens. Grinding induces high residual compressive stresses and high roughness compared to polishing. The characterization of the passive films was performed by electrochemical impedance spectroscopy and Mott–Schottky analysis. The study shows that the semiconductor properties and the thickness of the passive films are dependent on the surface state of the 304L stainless steel.

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