A5110789215- Fatigue and fracture mechanics
- Additive Manufacturing Materials and Processes
- Microstructure and mechanical properties
- Titanium Alloys Microstructure and Properties
- Welding Techniques and Residual Stresses
- Additive Manufacturing and 3D Printing Technologies
- Hydrogen embrittlement and corrosion behaviors in metals
- Surface Treatment and Residual Stress
- High-Velocity Impact and Material Behavior
- Microstructure and Mechanical Properties of Steels
- High Entropy Alloys Studies
- Metal Alloys Wear and Properties
- Aluminum Alloy Microstructure Properties
- High Temperature Alloys and Creep
- Metallurgy and Material Forming
- Metal Forming Simulation Techniques
- Aluminum Alloys Composites Properties
- Non-Destructive Testing Techniques
Institute of Mechanics
2018-2024
Chinese Academy of Sciences
2018-2024
University of Chinese Academy of Sciences
2018-2023
State Key Laboratory of Nonlinear Mechanics
2019-2021
Southwest Jiaotong University
2020
Abstract The fatigue behaviour of a titanium alloy Ti‐6Al‐4V with equiaxed microstructure (EM) under different values tensile mean stress or ratio ( R ) was investigated from high‐cycle (HCF) to very‐high‐cycle (VHCF) regimes via ultrasonic axial cycling. effect on the strength HCF and VHCF addressed by Goodman, Gerber, Authors' formula. Three types crack initiation, namely, surface‐with‐RA (rough area), surface‐without‐RA, interior‐with‐RA, were classified. maximum value intensity factor...
Additive manufacturing (AM) or 3D printing is a promising industrial technology that enables rapid prototyping of complex configurations. Powder Bed Fusion (PBF) one the most popular AM techniques for metallic materials. Until today, only few metals and alloys are available AM, e.g., titanium alloys, common which Ti-6Al-4V. After optimization PBF parameters, with without post processing such as heat treatment hot isostatic pressing, printed alloy can easily reach tensile strengths over 1100...
Abstract Gradient structure (GS) is commonly designed and processed in engineering materials to improve mechanical properties especially fatigue performance by taking advantage of the strengthened surface. However, whether very-high-cycle (VHCF) property can be improved GS questioning due different crack initiation mechanisms between low-, high-cycle VHCF. In this paper, a Ti-6Al-4V alloy generated pre-torsion characterized electron backscatter diffraction. Then VHCF behavior specimen...
The largest normal stress excursion during contiguous turn time instants of the maximum torsional is presented as an innovative path-independent fatigue damage quantity upon critical plane, which further employed for characterizing under multiaxial loading. Via using von Mises equivalent formula, axial amplitude with value proposed, incorporating range and plane. influence non-proportional cyclic hardening considered within range. Moreover, according to proposed amplitude, energy-based model...
The profile samples prepared by focused ion beam (FIB) in crack initiation region (CIR) and fish-eye (FiE) of failed specimens subjected to rotary bending (RB) ultrasonic axial (UL) fatigue testing with various stress ratios (R) were observed transmission electron microscopy (TEM) selected area diffraction (SAD) detection for two high-strength steels. grain size the thickness nanograin layer along growth path CIR underneath fine-granular-area (FGA) measured cases R < 0, a normalized quantity...
Additive manufacturing (AM) or 3D printing is a promising industrial technology that enables rapid prototyping of complex configurations. Powder Bed Fusion (PBF) one the most popular AM techniques for metallic materials. Until today, only few metals and alloys are available AM, e.g. titanium alloys, common which Ti-6Al-4V. After optimization PBF parameters, with without post processing such as heat treatment hot isostatic pressing, printed alloy can easily reach tensile strengths over 1100...
Traditionally, the primary or equiaxed α grains of titanium alloys are regarded as defects to cause crack initiation due their cyclic brittleness, and fatigue cracks will initiate from rather than lamellar microstructure (LM) clusters. Here, we found that is prone a large domain big α+β cluster an grain in alloy with composition coarse LM clusters fine grains. Then, mechanisms for cases high-cycle very-high-cycle under stress ratio R = -1, 0.1 0.5 addressed, showing numerous pressing process...