The optimal determination of forging process parameters for Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy with thick lamellar microstructure in two phase field based on P-map

Characterization of Microstructural Evolution for a Near-α Titanium Alloy with Different Initial Lamellar Microstructures

“…With the strain rate increasing to 0.1 s −1 , it was evident that the morphology of α phase changed in an obvious manner, which was more likely to be elongated rather than spheroidized (marked with a black arrow in Figure 6d). Thus, the η value at the lower strain rate was higher than that of the higher strain rate in the temperature range of 900 to 990 • C. The deformation characteristic of flow instability regions is always attributed to adiabatic shear deformation, internal cracks, and grain boundary cavities during the hot deformation of titanium alloys [23][24][25][26]. The results in our previous work by Zhao et al [4] showed that microstructures of the present alloy with acicular microstructure deformed in flow instability regions at a strain rate of 10 s −1 and exhibited flow localization bands.…”

The analysis of the hot deformation behaviour of the Ti–3Al–8V–6Cr–4Zr–4Mo alloy, using processing maps, a map of microstructure and of hardness

“…P-maps are prepared through the combination of a power dissipation efficiency map (g), illustrated by isoclines, with the parameter of flow instability (n). Processing maps, generated for a constant true strain and a changing temperature, are usually created from the results of compression testing [4,[8][9][10][11]. A strain rate sensitivity parameter, m, is a key parameter defining the relative (not absolute) partitioning of power between heat generation and microstructural changes.…”

“…Processing maps made the analysis of the behaviour of the broad spectrum of alloys [3,8,16], especially those of titanium [9][10][11][17][18][19][20][21][22][23][24][25][26][27][28][29][30], in the course of hot working, possible. Several approaches of material modelling, besides of the analysis of the shapes of stress-strain curves [9][10][11][18][19][20][21][22][23][24][25][26] and kinetic analysis [9,10,[18][19][20][21][22]26], used P-maps to aid forging process design [9][10][11]18,19,[21][22][23][24]…”

High temperature deformation behavior of BTi-62421S alloy

“…Titanium alloys have been used in many fields, especially in the aerospace industry due to their light weight, high specific strength, excellent fracture toughness, good creep and corrosion resistance [1][2][3][4][5][6][7]. However, high cost of raw materials, alloys, and final products severely restricts the wide applications of titanium alloys [3].…”