The Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Bar with a Large Diameter of 450 mm

2011 ◽  
Vol 690 ◽  
pp. 473-476
Author(s):  
Wei Qi Wang ◽  
Jie Dong
Keyword(s):  
Mechanical Properties ◽  
Large Diameter ◽  
Ultrasonic Inspection ◽  
Thermomechanical Process ◽  
Aerospace Application ◽  
Class A ◽  
Uniform Microstructure ◽  
Heavy Section ◽  
Microstructure And Mechanical Properties

A special thermomechanical process has been developed in order to improve the homogeneity of the microstructure and mechanical properties of Ti-6Al-4V alloy bar with a diameter of 450 mm for aerospace application. This study has investigated microstructure and mechanical properties on the large diameter bar. It has been found that the heavy section of the bar has uniform microstructure and mechanical properties, which can meet the specifications for Ti-6Al-4V alloy bar with a diameter of 300 mm, and ultrasonic inspection can meet the specification of ASM 2631 class A.

scholarly journals Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1351 ◽  
Author(s):  
Yuebing Li ◽  
Wei Fang ◽  
Chuanyang Lu ◽  
Zengliang Gao ◽  
Xiakang Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Manufacturing Process ◽  
Large Diameter ◽  
Base Material ◽  
Flow Forming ◽  
Cold Flow ◽  
Microstructure And Mechanical Properties ◽  
Hot Drawing ◽  
34Crmo4 Steel ◽  
Gas Cylinders

An integral manufacturing process with hot drawing and cold flow forming was proposed for large-diameter seamless steel gas cylinders. The main purpose of this study was to find out the effects of the manufacturing process on the microstructure and mechanical properties of gas cylinders made of 34CrMo4 steel. Two preformed cylinders were produced by hot drawing. One cylinder was then further manufactured by cold flow forming. The experiments were carried out using three types of material sample, namely, base material (BM), hot drawing cylinder (HD), and cold flow-formed cylinder (CF). Tensile and impact tests were performed to examine the mechanical properties of the cylinders in longitudinal and transverse directions. Microstructure evolution was analyzed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) to reveal the relation between the mechanical properties and the microstructure of the material. It is found that the mechanical properties of the 34CrMo4 steel gas cylinders were significantly improved after hot drawing and flow forming plus a designed heat treatment, compared with the base material. The observations of microstructure features such as grain size, subgrain boundaries, and residual strain support the increase in mechanical properties due to the proposed manufacturing process.

scholarly journals Process Design Strategies for Producing Heavy Section Steel with Improved Quality

2013 ◽  
Vol 652-654 ◽  
pp. 988-991
Author(s):  
Jing Wei Zhao ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei ◽  
Chong Soo Lee
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Longitudinal Direction ◽  
Ring Rolling ◽  
Design Strategies ◽  
Noticeable Effect ◽  
Heavy Section ◽  
Microstructure And Mechanical Properties ◽  
Impact Energies ◽  
The Impact

Uniformity of microstructure and mechanical properties is required for the heavy section steel. In the present work, a heavy section wind tower flange was manufactured by controlled ring-rolling. Post-rolling heat treatment was employed to optimize the microstructure and mechanical properties. The chemical composition, microstructure and mechanical properties in different zones of the flange were investigated. The results showed that the chemical composition and microstructure were uniformly distributed in the flange. The tensile strength showed similar values in different sampling locations. The strain and impact energies of specimens prepared along the longitudinal direction were higher than that prepared along both the radius and thickness directions. Notch direction did not have noticeable effect on the impact energy. It is demonstrated that the designed process is effective for producing heavy section steel with improved quality.

scholarly journals Microstructure and Mechanical Properties of Si3N4-Fe3Si Composites Prepared by Gas-Pressure Sintering

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1206
Author(s):  
Jiasuo Guan ◽  
Laifei Cheng ◽  
Mingxing Li
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Crack Deflection ◽  
Gas Pressure ◽  
Interface Debonding ◽  
Abnormal Growth ◽  
Pull Out ◽  
Uniform Microstructure ◽  
Microstructure And Mechanical Properties ◽  
Gas Pressure Sintering

Si3N4-Fe3Si composites were prepared using Fe-Si3N4 as the source of Fe3Si by gas-pressure sintering. By adding different amounts of Fe-Si3N4 into the starting powders, Si3N4-Fe3Si composites with various Fe3Si phase contents were obtained. The microstructure and mechanical properties of the composites were investigated. With the increase of Fe-Si3N4 contents, the content and particle size of Fe3Si both increased. When more than 60 wt. % Fe-Si3N4 were added, the abnormal growth of Fe3Si particles occurred and oversized Fe3Si particles appeared, leading to non-uniform microstructures and worse mechanical properties of the composites. It has been found that Fe3Si particles could toughen the composites through particle pull-out, interface debonding, crack deflection, and particle bridging. Uniform microstructure and improved mechanical properties (flexural strength of 354 MPa and fracture toughness of 8.4 MPa·m1/2) can be achieved for FSN40.

Sign in / Sign up

Export Citation Format

Share Document