Fatigue Fracture and Microstructure of TC11 Titanium Alloy after High Cycle Fatigue at Room Temperature
Journal Title: 河南科技大学学报（自然科学版） - Year 2019, Vol 40, Issue 1
Abstract
The fatigue fracture and microstructure near the fatigue fracture of TC11 titanium alloy after high cycle fatigue were analyzed by means of optical microscope ( OM) , scanning electron microscopy ( SEM) and transmission electron microscopy ( TEM) . The results show that the fatigue fracture under different loads is composed of fatigue source area, crack propagation area and transient breaking area. Meanwhile, there are large amounts of secondary cracks perpendicular to propagation directions of the fatigue crack. With the load increasing, the number of secondary cracks and the width of the cracks increase, as well as the width of fatigue striations. When the load is from 475 MPa to 525 MPa, the width of fatigue striations increases from 0. 6 μm to 1 μm. Under alternating load, a large number of dislocation substructures are emerged in titanium alloy, and high density dislocation pile-up lies in the interface of α and β, leading to the stress concentration. Finally, the crack source is formed and the fatigue life is reduced.
Authors and Affiliations
Meixiang FAN, Yi XIONG, Yanna CHEN, Xiaoqin ZHA, Pei CHEN
Keywords
Related Articles
- EP ID EP427024
- DOI 10.15926/j.cnki.issn1672-6871.2019.01.002
- Views 84
- Downloads 0
Microwave Synthesis of K2Ti4O9 Whiskers
The microwave heating was applied to synthesize K2Ti4O9 whiskers by using K2CO3 and TiO2powders as raw materials. The phase composition and microstructure of the samples were characterized by X-ray diffraction( XRD) and...
Combustion Properties of Hydrogen-Enriched Methane in Micro-Power Plants
In view of the problem of combustion instability in the the micro homogeneous charge compression ignition ( HCCI) free-piston power plant, the combustion propery of hydroge-enriched methane in a cylindrical micro-combust...
Effect of Fermentation Mode on Content and Antioxidant Activity of Total Flavonoids in Humulus scandens
To study effect of fermentation mode on the content and antioxidant activity of total flavonoids in Humulus scandens, the test of control group, natural fermentation and lactobacillus fermentation group was conducted, re...
Fuzzy Controller Design for Nonlinear Systems Under Nonuniform Sampling
The nonuniform sampling fuzzy state feedback control for a class of nonlinear systems satisfying the locally Lipschitz condition was studied. By defining a Lyapunov function dependent on sampling time and using a convex...
Interface Layer Structure and Properties of Cu / Al Compound Plate
The Cu / Al composite plate was prepared by twin-roll casting. Peel testing and tensile testing were used to test mechanical properties of Cu / Al composite. The scanning electron microscope( SEM),energy dispersive spect...