Investigation on Hot Deformation Behavior and Hot Processing Map of BSTMUF601 Super-Alloy

Abstract

Isothermal compression tests of BSTMUF601 super-alloy in the temperature range of 950˝C-1200˝C and at the strain rates of 0.2 s´1, 5 s´1, 10 s´1 were performed on a Gleeble-1500D thermo-mechanical simulator. Based on the hyperbolic sine function, the unified constitutive equations and hot processing maps during the hot deformation process were established. The flow stress predicted by the constitutive equations shows good agreement with the corrected stress. Hot processing maps for hot working conditions were established based on exploring the effect of power dissipation efficiency and the instability coefficient associated with various kinds of temperatures and stain rates. Subsequently, power dissipation efficiency and the instability coefficient were interpreted based on hot processing maps under a series of strains, temperatures and strain rates. The results show that power dissipation efficiency increases gradually with the increasing temperature and the decreasing stain rate, and instability domains reduce first, then increase with the increase of true strain. The optimum hot working condition of BSTMUF601 super-alloy was obtained.

Deformation Characteristic and Constitutive Modeling of 2707 Hyper Duplex Stainless Steel under Hot Compression

“…In order to reduce friction between the sample and thermal simulation testing machine squeeze head, graphite flakes with 0.25 mm thickness and 12 mm diameter were clamped between them. And tantalum sheets (Changsha Nanfang Tantalum Niobium Co., Ltd., Changsha, China) were used to prevent adhesion between the sample and the squeeze head [19].…”

Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases

“…Hot processing maps have been widely used to study deformation behaviors of many materials [5,16,17].Processing maps are normally constructed by overprinting power dissipation maps and instability regime maps. Processing maps are based on the dynamic materials model, the principles of which have been described earlier [18][19][20][21].…”

“…Hot processing maps have been widely used to study deformation behaviors of many materials [5,16,17]. Processing maps are normally constructed by overprinting power dissipation maps and instability regime maps.…”

Constitutive equation and hot processing map of TA15 titanium alloy

“…Based on the dynamic material model, the hot processing map of the alloy at the true strain of 0.1∼0.7 was established. The hot processing map is very practical for studying the flow stress of materials and optimizing the parameters of heat treatment, and its practicality has been used in Bstmuf601 superalloy [14], medium and high carbon high silicon bainite steel [15], as-cast 6Mo super austenitic stainless [16], Sa508-Iv steel [17], 34CrNiMo6 steel [18], Fe-Mn-Al-C steel [19] and other materials have been proven.Constitutive model is the key to the relationship between reaction rheological behavior and metal and alloy parameters [20][21][22][23]. Therefore, the flow stress, constitutive equation, hot processing map and thermal deformation structure of TA15 material under high temperature conditions should be studied.…”

“…Based on the dynamic material model, the hot processing map of the alloy at the true strain of 0.1∼0.7 was established. The hot processing map is very practical for studying the flow stress of materials and optimizing the parameters of heat treatment, and its practicality has been used in Bstmuf601 superalloy [14], medium and high carbon high silicon bainite steel [15], as-cast 6Mo super austenitic stainless [16], Sa508-Iv steel [17], 34CrNiMo6 steel [18], Fe-Mn-Al-C steel [19] and other materials have been proven.…”