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Effects of holding time and Zener-Hollomon parameters on deformation behavior of cast Mg-8Gd-3Y alloy during double-pass hot compressionXi Nie,Shuai Dong,Fenghua Wang,Li Jin,Jie DongNational... tests were carried out over a wide range of holding time(0–180 s) and Zener-Hollomon parameter(1.6 E15–1.3 E20) to study the deformation behavior of cast Mg-8 Gd-3 Y alloy.The flow curves show obvious......
形温度对合金流变应力的大小有显著影响, 流变应力随温度升高而降低, 随应变速率的提高而增大, 在应变速率<10s-1条件下, 流变应力开始随应变增加而增大, 达到峰值后趋于平稳, 表现出动态回复的特征; 而在=10s-1, t≥350℃的变形条件下, 合金发生了局部动态再结晶. 可用包含Arrhenius项的Zener-Hollomon参数描述2519铝合金高温塑性变形时的流变行为. 关键词... recrystallization.The flow stress of 2519 aluminum alloy during high temperature deformation can be represented by Zener-Hollomon parameter including the Arrhenius term. Key words: 2519 aluminum alloy; hot......
and parallel FEM simulations, it was concluded that the critical fracture strain is a function of a single argument Zener-Hollomon parameter, and there is a linear relationship between them. An Oyane... based on Zener-Hollomon parameter was established. Key words: Ti40 alloy; ductile fracture; Zener-Hollomon parameter; Oyane criterion; critical fracture value ......
. The dependence of the peak stress, initial stress, saturation stress, steady state stress and peak stain on Zener-Hollomon parameter were obtained. The mathematical models of dynamic recrystallization fraction... for numerical simulation of hot forging. Key words: microalloyed forging steel; flow stress; dynamic recovery; dynamic recrystallization; Zener-Hollomon parameter 1 Introduction During hot working......
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of the alloy during the elevated temperature deformation can be represented by a Zener-Hollomon parameter with the inclusion of the Arrhenius term. The values of n, α and A in the analytical...; hot compression deformation; Zener-Hollomon parameter ......
at different strains were calculated using the Arrhenius equation. The effects of temperature and strain rate on deformation behavior were represented using the Zener–Hollomon parameter in an exponent-type... during high temperature deformation. Key words: constitutive model; Mg-Li alloy; plastic instability; Zener-Hollomon parameter 1 Introduction Mg alloys are considered to be one of the lightest......
45钢高温拉伸峰值应力和变形储能与Z参数的关系函数研究 游红1,黄光杰1,钱宝华1 (1.重庆大学,材料科学与工程学院,重庆,400044) 摘要:通过Gleeble-1500D热模拟试验机进行高温拉伸实验,变形温度范围1123~1273K,初始应变速率范围0.01~5s-1,并采用双曲正弦模型,研究了45钢在高温拉伸条件下的峰值应力,变形储能与Zener-Hollomon参数的关系函数.结果表明:峰值应力与Z参数之间能较好地满足双曲正弦关系,其激活能为336.0kJ/mol;同时,变形储能与Z参数满足ΔGD=0.1269(lnZ)2-6.8262(lnZ)+ 93.873函数关系,且随着应变速率的增加和变形温度的下降而上升,其值在2~20J/mol之间波动. 关键词:峰值应力; 关系函数; Zener-Hollomon参数; 变形储能; [全文内容正在添加中] ......
s-1条件下的流变应力特征,并利用TEM分析了合金在不同变形条件下的组织形貌特征.结果表明,应变速率和变形温度对合金流变应力的大小有显著影响,流变应力随变形温度的升高而降低,随应变速率的提高而增大;合金平均亚晶尺寸随温度补偿应变速率Zener-Hollomon参数的升高而减小.可用Zener-Hollomon咖参数描述该Al-Zn-Mg-Cu合金热变形时的流变应力行为. 关键词:Al-Zn-Mg-Cu合金; 热压缩变形; 流变应力; zener-Hollomon参数; [全文内容正在添加中] ......
X120管线钢热变形行为及动态再结晶晶粒的演变规律高建忠1,郭斌1,徐进桥2,郭爱民1,王青峰3(1.燕山大学 亚稳材料制备技术与科学国家重点实验室,秦皇岛 0660042.武汉钢铁(集团)公司 武钢研究院3.河北省秦皇岛市燕山大学亚稳材料科学与技术国家重点实验室)摘 要:采用Gleeble-3500单道次热压缩试验研究了X120管线钢的动态再结晶行为.结果表明:该钢在温度1 050~1 150℃和应变速率0.01~0.1 s-1下变形时容易发生动态再结晶;当应变速率为1~10 s-1时,动态再结晶难于发生.该......
