Microstructure evolution and strengthening mechanisms of pure titanium with nano-structured surface obtained by high energy shot peening

Vacuum ◽  
2016 ◽  
Vol 125 ◽  
pp. 215-221 ◽  
Author(s):  
Shijuan Dai ◽  
Yuntian Zhu ◽  
Zhaowen Huang
Keyword(s):  
Microstructure Evolution ◽  
Shot Peening ◽  
Pure Titanium ◽  
High Energy ◽  
Strengthening Mechanisms ◽  
Structured Surface

Effect of Surface Nano-Crystallization on Microstructure and Mechanic Properties of Commercial Pure Titanium

2004 ◽  
Vol 261-263 ◽  
pp. 1605-1610 ◽  
Author(s):  
Ai Ling Wen ◽  
R.M. Ren ◽  
Sheng Wu Wang ◽  
Shinichi Nishida
Keyword(s):  
Grain Size ◽  
Surface Layer ◽  
Shot Peening ◽  
Pure Titanium ◽  
High Energy ◽  
X Ray Diffraction ◽  
Surface Microhardness ◽  
Commercial Pure Titanium ◽  
Nano Crystalline ◽  
Crystalline Surface

The paper investigated nano-crystallization on surface layer of commercial pure titanium by using high-energy shot peening. The grain size and the microstructure in deformed surface layer by high-energy shot peening are analyzed with X-ray diffraction and TEM etc. In addition, the variations of surface microhardness are examined after high-energy shot peening. The results described that the nano-crystalline surface layer have been formed in commercial pure titanium with a structure of hexagonal closet packet, by high-energy shot peening. The surface microhardness increases and the grain size in nano-crystalline surface layer diminishes, with increasing the time in high-energy shot peening. The minimum nano-crystalline grain size is approximately 40 nm.

High Energy Shot Peening of Commercially Pure Titanium TIG Weld Joint

2010 ◽  
Vol 148-149 ◽  
pp. 659-663
Author(s):  
Chun Huan Chen ◽  
Rui Ming Ren
Keyword(s):  
Surface Layer ◽  
Weld Joint ◽  
Shot Peening ◽  
Welded Joint ◽  
Pure Titanium ◽  
High Energy ◽  
Commercially Pure Titanium ◽  
Nanostructured Surface ◽  
Commercially Pure ◽  
Cp Ti

Commercially pure Titanium (CP-Ti) TIG weld joint was treated by means of high energy shot peening (HESP) using a shot peening equipment commonly used in industry. The nanostructured surface layer was characterized by XRD, TEM, SEM and Microhardometer. The results showed that surface nanocrystallization of CP-Ti TIG weld joint were realized by high energy shot peening treatment. The finest grain size in the top surface layer is about 40nm. The hardness of the surface layer is enhanced significantly after shot peening compared with that of the as-welded joint, which resulted in a remarkable surface hardening effect. Surface welded defects such as air pores are eliminated successfully so that relative uniform surface layer was obtained.

Microstructure evolution of AZ91D induced by high energy shot peening

2008 ◽  
Vol 18 (5) ◽  
pp. 1053-1057 ◽  
Author(s):  
Li-feng HOU ◽  
Ying-hui WEI ◽  
Bao-sheng LIU ◽  
Bing-she XU
Keyword(s):  
Microstructure Evolution ◽  
Shot Peening ◽  
High Energy

Prepare and Properties of Titanium with Surface Nanostructure by High Energy Shot Peening

2013 ◽  
Vol 842 ◽  
pp. 267-270 ◽  
Author(s):  
Bao Di Yin ◽  
Shuo Fei Zhang ◽  
Jing Yuan Yang ◽  
Zhen Nan Deng ◽  
Yu Sun
Keyword(s):  
Surface Modification ◽  
Shot Peening ◽  
Titanium Surface ◽  
Pure Titanium ◽  
High Energy ◽  
Tissue Growth ◽  
Nanostructured Titanium ◽  
Modification Process ◽  
Proliferation And Differentiation ◽  
Surface Nanostructure

The investigation was carried out to study the effect of a novel process of surface modification, surface nanocrystallization by high energy shot peening (HESP), on osteoblast proliferation and differentiation. A disc of pure titanium was processed to HESP in a commercial shot peening equipment, to create nanostructure at the surface. The surface microstructure was characterized by SEM and osteoblasts were co-cultured with the surface nanostructured titanium and unreceived titanium surface to evaluate their biocompatibility. The nanostructured surface layer on titanium was successfully processed by HESP, and the nanosized grains were about 60 nm in diameter and inhomogeneous distributed on the surface of n-Ti. The results also confirmed the proliferation and differentiation of osteoblasts were highly improved on surface nanostructured titanium. This finding suggests that there is high potential of this novel surface modification process which could enhance bone tissue growth of dental implant.

Effect of Surface Nanocrystallization Method on Fatigue Strength of TA2

2009 ◽  
Vol 620-622 ◽  
pp. 545-549 ◽  
Author(s):  
Ai Ling Wen ◽  
Rui Ming Ren ◽  
Sheng Wu Wang ◽  
Jun Yong Yang
Keyword(s):  
Fatigue Strength ◽  
Fatigue Limit ◽  
Shot Peening ◽  
Fatigue Crack Initiation ◽  
Pure Titanium ◽  
Small Diameter ◽  
Surface States ◽  
High Energy ◽  
Commercial Pure Titanium ◽  
Initiation And Propagation

The enhancement of the fatigue strength is significant for the engineering applications of commercial pure titanium and its alloys. The paper investigated improvement of fatigue strength for commercial pure titanium by combined high-energy shot peening. Firstly, nano-crystallization in surface layer of pure titanium was carried out by high-energy shot peening, and then the shot peening with small diameter shots was introduced to degrade the surface roughness, enhancing the quality of the nano-grained surface. The fatigue limit of pure titanium by high-energy shot peening turns out to be increased by 34%, and the fatigue limit of pure titanium by compound high-energy shot peening turns out to be increased by 52.3%, according to the results. Effective factors such as surface states etc. to fatigue life, the fatigue crack initiation and propagation behaviors were also discussed in this paper.

Microstructure Evolution of a Fine Grain Al-50wt%Si Alloy Fabricated by High Energy Milling

2011 ◽  
Vol 479 ◽  
pp. 54-61 ◽  
Author(s):  
Fei Wang ◽  
Ya Ping Wang
Keyword(s):  
Grain Growth ◽  
Microstructure Evolution ◽  
Room Temperature ◽  
Milling Time ◽  
High Energy ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Laser Method ◽  
X Ray ◽  
Fine Grain

Microstructure evolution of high energy milled Al-50wt%Si alloy during heat treatment at different temperature was studied. Scanning electron microscope (SEM) and X-ray diffraction (XRD) results show that the size of the alloy powders decreased with increasing milling time. The observable coarsening of Si particles was not seen below 730°C in the high energy milled alloy, whereas, for the alloy prepared by mixed Al and Si powders, the grain growth occurred at 660°C. The activation energy for the grain growth of Si particles in the high energy milled alloy was determined as about 244 kJ/mol by the differential scanning calorimetry (DSC) data analysis. The size of Si particles in the hot pressed Al-50wt%Si alloy prepared by high energy milled powders was 5-30 m at 700°C, which was significantly reduced compared to that of the original Si powders. Thermal diffusivity of the hot pressed Al-50wt%Si alloy was 55 mm2/s at room temperature which was obtained by laser method.

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