scholarly journals Characterization of surface layer formed by gas blow induction heating nitriding at different temperatures and its effect on the fatigue properties of titanium alloy

2020 ◽  
Vol 5 ◽  
pp. 100071 ◽  
Author(s):  
Shogo Takesue ◽  
Shoichi Kikuchi ◽  
Hiroyuki Akebono ◽  
Tatsuro Morita ◽  
Jun Komotori
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Induction Heating ◽  
Fatigue Properties ◽  
Different Temperatures

Characterization of nanocrystalline surface layer induced by shot peening and effect on their fatigue strength.

2004 ◽  
Vol 843 ◽  
Author(s):  
Hideo Mano ◽  
Kondo Satoru ◽  
Akihito Matsumuro ◽  
Toru Imura
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Fatigue Strength ◽  
Vickers Hardness ◽  
Shot Peening ◽  
White Layer ◽  
The Other ◽  
Fatigue Properties ◽  
Nanocrystalline Layer

ABSTRACTThe shot peening process is known to produce a hard layer, known as the white layer” on the surface of coil springs. However, little is known about the fatigue properties of this white-layer.In this study, coil springs with a white-layer were manufactured. The surface of these springs was then examined using micro Vickers hardness, FE-SEM etc. to test fatigue strength of the springs.From the results obtained, a microstructure of the white-layer with grain size of 50–100 nm was observed, with a Vickers hardness rating of 8–10 GPa.Tow category springs were manufactured utilizing a double-peening process. These springs had the same residual stress destruction and surface roughness. Only one difference was observed: one spring had a nanocrystalline layer on the surface, while the other did not. The results of the fatigue test realized an increase in the fatigue life of the nanocrystalline surface layer by 9%.

scholarly journals A Study Surface Layer and Hardness Produced by Induction Hardened S45C Steel

2014 ◽  
Vol 664 ◽  
pp. 43-47 ◽  
Author(s):  
Alain Kusmoko ◽  
Rosfian Arsyah Dahar ◽  
Hui Jun Li ◽  
Syamsul Hadi
Keyword(s):  
Surface Layer ◽  
Internal Stress ◽  
Induction Heating ◽  
Retained Austenite ◽  
Surface Hardness ◽  
Case Depth ◽  
Chemical Compositions ◽  
Different Temperatures ◽  
Significant Case ◽  
Cooling Speed

A cylinder of Carbon Steel S45C with a ferrite and pearlite structure was analysed to improve the hardness and surface layer as well as the toughness. Accordingly, it is important to undertake a heat treatment process for the hardness and surface layer of this steel. The heat teatment process was carried out using induction heating with five different temperatures of 800°C, 900°C, 1000°C, 1100°C and 1200 °C followed by water quenching with certain cooling speed. The chemical compositions and microstructures of these samples were characterized by spectrometer and optical microscopy. The microhardness of the samples was measured and the surface treatment of the samples was examined using an induction heating furnace. The results showed significant case depth and surface hardness as well as microstructure with martensite and retained austenite that is hard and brittle because of internal stress. Further, to reduce the amount of retained austenite and internal stress, it is necessary to carry out tempering of 300°C, 500°C and 700°C in order to produce toughness of the steel with slightly reduce in hardness.

Study on Rotating Bending Fatigue Property of Ti65 Titanium Alloy

2016 ◽  
Vol 849 ◽  
pp. 347-352
Author(s):  
Xu Wang ◽  
Si Qing Li ◽  
Jing Nan Liu
Keyword(s):  
Titanium Alloy ◽  
Fatigue Strength ◽  
Room Temperature ◽  
Fatigue Property ◽  
Fatigue Properties ◽  
Bending Fatigue ◽  
Notched Specimens ◽  
Different Temperatures ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

The rotating bending fatigue properties of Ti65 titanium alloy blisk forging was studied in the present investigation. The smooth and notched specimens were prepared to test the fatigue properties at room temperature and 650°C. Meanwhile, the influences on rotating bending fatigue of temperature and type were analyzed. Furthermore, the fractural morphology was observed through scanning electron microscopy. The results showed that the medium fatigue strength of Ti65 titanium alloy decreased at 650°C compared with that at room temperature, and the fatigue strength of notched specimens indicated the same significant declination at different temperatures compared with smooth specimens. At room temperature the medium fatigue strength of smooth and notched are 473MPa and 173MPa, respectively, and the fatigue notch sensitive coefficient was 0.87. At 650°C the medium fatigue strength of smooth and notched specimens are 427MPa and 168MPa, where the fatigue notch sensitive coefficient was 0.78.

Experimental and Numerical Analysis of Fatigue Properties Improvement in a Titanium Alloy by Shot Peening

2010 ◽  
Author(s):  
Sara Bagherifard ◽  
Marco Giglio ◽  
Lorenzo Giudici ◽  
Mario Guagliano
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Shot Peening ◽  
Fatigue Behavior ◽  
Quantitative Description ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
X Ray Diffraction ◽  
Residual Stress Field ◽  
Good Correspondence

Shot peening (SP) is a mechanical surface treatment commonly performed to improve the fatigue behavior through creation of compressive residual stresses close to surface and work hardening of the surface material. Notwithstanding wide application of shot peening in the industrial environment, the determination of optimal peening condition for Ti alloys is still more an art than a science, taking into account that there is not a well established method to choose the process parameters in order to enhance the fatigue behavior. In this paper a comprehensive numerical and experimental study is presented aimed at finding the optimized peening conditions based on characterization of surface layer of material after multiple impacts. The numerical simulations provide a quantitative description of shot peening effects in terms of residual stress field and thickness of work-hardened surface layer. Comparison with numerical results, obtained by means of X-ray diffraction (XRD), shows a very good correspondence. Finally the results of experimental bending fatigue tests, performed on shot peened specimens by means of Rumul Cracktronics machine, confirm that shot peening significantly increases the fatigue strength of the considered Titanium alloy.

Characterization of fatigue properties of powder metallurgy titanium alloy

2016 ◽  
Vol 654 ◽  
pp. 418-425 ◽  
Author(s):  
Yuankui Cao ◽  
Fanpei Zeng ◽  
Bin Liu ◽  
Yong Liu ◽  
Jinzhong Lu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Powder Metallurgy ◽  
Fatigue Properties

Characterization of the Hydrogen Migration in a VT1-0 Titanium Alloy by Thermo-EMF and Eddy Current Nondestructive Control Methods

2020 ◽  
Vol 2020 (11) ◽  
pp. 1276-1282
Author(s):  
Syui Shupen ◽  
V. V. Larionov ◽  
V. N. Kudiyarov ◽  
R. R. Elman ◽  
A. M. Lider
Keyword(s):  
Titanium Alloy ◽  
Eddy Current ◽  
Control Methods ◽  
Nondestructive Control ◽  
Hydrogen Migration

Synthesis and Characterization of Nanocrystalline ZnO Powders by a Direct Thermal Decomposition Route Using Zinc Nitrate Hexahydrate

2013 ◽  
Vol 770 ◽  
pp. 68-71 ◽  
Author(s):  
Supphadate Sujinnapram ◽  
Uraiphorn Termsuk ◽  
Atcharawan Charoentam ◽  
Sutthipoj Sutthana
Keyword(s):  
Thermal Decomposition ◽  
Crystallization Temperature ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Absorption Peak ◽  
Synthesis And Characterization ◽  
Nitrate Hexahydrate ◽  
Different Temperatures ◽  
Zno Powders

The nanocrystalline ZnO powders were synthesized by a direct thermal decomposition using zinc nitrate hexahydrate as starting materials. The precursor was characterized by TG-DTA to determine the thermal decomposition and crystallization temperature which was found to be at 325 oC. The precursors were calcined at different temperatures of 400, 500, and 600°C for 4 h. The structure of the prepared samples was studied by XRD, confirming the formation of wurtzite structure. The synthesized powders exhibited the UV absorption below 400 nm (3.10 eV) with a well defined absorption peak at around 285 nm (4.35 eV). The estimated direct bandgaps were obtained to be 3.19, 3.16, and 3.14 eV for the ZnO samples thermally decomposed at 400, 500, and 600°C, respectively.

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