Abstract
In order to manufacture complex curvilinear generatrix workpieces of high-temperature titanium alloy, the hot tensile behavior of Ti55 alloy sheet was tested and the hot press forming process was investigated using Finite Element Method (FEM) simulation and experiment. The hot tensile experiments of Ti55 rolled sheet were conducted at the temperatures of 800–900 °C with the strain rates of 0.001–0.1 s−1. According to the results of hot tensile tests and microstructure evolution, the proper hot press forming parameters were determined as the temperature of 850 °C and the strain rates of 0.001–0.01 s−1. The wrinkling mechanism in the transition region was analyzed and the initial blank sheet geometry was optimized by FE simulation of hot press forming. The two-step hot press forming process was better to produce the complex sheet workpiece of Ti55 alloy than the one-step hot forming scheme, which could restrain the wrinkling trend and ensure the microstructure and mechanical properties of the hot formed workpieces.
Highlights
Titanium and its alloys are found to have extensive applications in aerospace, marine, chemical, and medical industries due to their excellent properties, such as good high temperature performance, high specific strength, good creep resistance, biocompatibility and good corrosion resistance [1].Especially, high-temperature titanium alloys, such as Ti-1100 and IMI834, are attracting increasing attention in the aerospace domain
The Finite Element Method (FEM) simulation of the hot press forming process based on ABAQUS software was conducted to reveal the wrinkling mechanism and optimize the process design for a complex curvilinear generatrix workpiece of Ti55 alloy with large dimension
The hot tensile behavior of as-rolled sheet of Ti55 alloy was tested at the temperatures of 800–900 ◦ C
Summary
Titanium and its alloys are found to have extensive applications in aerospace, marine, chemical, and medical industries due to their excellent properties, such as good high temperature performance, high specific strength, good creep resistance, biocompatibility and good corrosion resistance [1]. It is difficult to manufacture the thin-wall complex-shaped components of high-temperature titanium alloys because of their poor formability, such as high strength and strong sensitivity to deformation parameters (temperature, strain rate, etc) at elevated temperatures To address this issue, many studies are conducted to analyze and control the microstructure evolution and mechanical properties of high-temperature titanium alloy. The hot press forming process was adopted to manufacture the large curvilinear generatrix workpiece of Ti55 high-temperature titanium alloy. The Finite Element Method (FEM) simulation of the hot press forming process based on ABAQUS software was conducted to reveal the wrinkling mechanism and optimize the process design for a complex curvilinear generatrix workpiece of Ti55 alloy with large dimension. The two-step hot press forming scheme was determined to successfully produce the curvilinear generatrix workpiece of Ti55 alloy without significant change of microstructure and mechanical properties
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