6069铝合金的热变形行为和加工图

采用Gleeble-1500热模拟实验机在温度为300～450℃,应变速率为0.01～10 s?1条件下对6069铝合金进行热压缩实验,研究该合金的热变形行为及热加工特征,建立热变形本构方程和加工图。结果表明,6069铝合金热变形过程中的流变行为可用双曲正弦模型来描述,在实验条件下的平均变形激活能为289.36 kJ/mol。真应变为0.7的加工图表明合金在高温变形时存在2个安全加工区域,即变形温度为300～350℃、应变速率为1～10 s?1的区域和变形温度为380～450℃、应变速率为0.01～0.3 s?1的区域。适合加工的条件是变形温度为350℃,应变速率0.01 s?1。  

冷作模具钢D2钢高温变形行为的研究

利用ＧＬＥＥＢＬＥ－１５００热力模拟机，对Ｄ２钢的高温变形行为进行实验研究，结果表明：Ｄ２钢在变形温度为９００￣１１６０℃、变形速率为０．０１￣１０ｓ＾－１的区间变形时，发生动态再结晶、动态应变时效、脆性穿晶断裂以及热裂等过程，并分析了其原因。在此基础上对Ｄ２钢的高温变形工艺制度进行了优化，以指导生产实践。  

热带粗轧机组调宽时材料的变形行为

为实现连铸与热带轧制宽度的衔接，热带粗轧机组中广泛采用宽度方向大侧压的方法。本文简要地论述了采用平辊立轧－平轧方式调宽过程中轧件的主要变形特点，并指出了我国今后在现有热带热轧机上采用粗轧调宽技术的途径。  

BH08G焊接用钢的热变形行为及动力学再结晶模型

用Gleeble-1500热模拟试验机研究了成分(%)为0·08C、1·59Mn、0·34Mo、0·12Ti的BH08G焊接用钢在950~1050℃、变形速率·ε为0·1~10·0s-1时的热变形行为。通过奥氏体再结晶动力学回归计算得出:BH08G钢的Zener-Hollomon参数Z与峰值应力的关系式为Z=3·829×1012exp(0.04646σm);峰值应力σm、动态再结晶临界应变εc、峰值应变εm、动态再结晶完成应变εs与lnZ的关系为:σm=21·338lnZ-516·49,εc≈0·83εm=0.0326lnZ-0·732,εs=0.0522lnZ-0.9801。通过BH08G钢动态再结晶状态图得出,BH08G钢粗轧温度为980~1050℃、精轧温度为930~980℃,有利于变形晶粒细化,改善材料的力学性能。  

Study on the Deformation Behavior of Mg-3.6% Er Magnesium Alloy

The deformation behaviour of a casting Mg-3.6%Er magnesium alloy after T6 treatment was studied in tensile tests from room temperature to 450 ℃ under different strain rates ranging from 1.0×10-4 to 6.0×10-3 s-1.Obtained local plateau in the temperature dependence of the ultimate strength (σ b) and yield strength (σ 0.2) under constant strain rate indicated the presence of dynamic strain ageing (DSA).Serrated flow was observed at the temperature of 200, 250, and 300 ℃.The observed negative strain rate sensitivity suggested that the serrated flow behavior arose from DSA.The temperature and strain rate dependence of the critical strain for the onset of serrated flow was analyzed using a phenomenological DSA equation, and the apparent activation energy Q for the serrated flow was obtained by calculation.  

Constitution modeling and deformation behavior of yttrium bearing TiAl alloy

The deformation flow behaviors of Ti-45Al-5.4V-3.6Nb-0.3Y alloy at different temperatures and strain rates were studied by isothermal compressing simulation test.The apparent activation energy of deformation was calculated to be 402.096 kJ/mol and constitutive equation was established to describe the flow behavior.Microstructure and flow softening observations exhibited that Ti-45Al-5.4V3.6Nb-0.3Y alloy had bad hot workability at low temperature (lower than 1 100 oC) and high strain rate (higher than 0.5 s–...  

温度对Mn16Cr22Ni1.6N0.6高氮钢的热变形行为和组织的影响

通过Gleeble 1500D热模拟实验,研究了Mn16Cr22Ni1.6N0.6高氮奥氏体不锈钢(%:0.12C、22.05Cr、15.52Mn、1.64Ni、0.58N)在900～1300℃,应变速率(ε)0.005 s-1时拉伸热变形行为及其组织变化.结果表明,该高氮钢在1100～1250℃时塑性较好.1220 ℃断面收缩率最大为59%.拉伸断口处组织的观察表明,900～1000℃拉伸时,已发生再结晶,有较细的晶粒生成;1000～1100℃时,再结晶的晶粒长大,有锯齿状的晶界;1100～1300℃时有铁素体出现,而且随温度的升高,铁素体含量增多,1300℃时晶界发生了融化现象.  

Effects of temperature on tensile properties and deformation behavior of GH4586A superalloy

With the rapid development of the aero-spaceindustry, the more excellent properties of the superal-loy used for turbine disk are required. GH4586 alloyis a new precipitation hardening Ni-base wrought su-peralloy which is developed independently in Chi-na[1,2]. GH4586 alloy has improved impact toughnessat RT(room temperature), high temperature stressrupture and creep properties with higher cleanlinessand it has already been applied on the turbine disk ofrocket with 120 Thigh driving force suc…  

温度对GH4586A合金拉伸性能及变形行为的影响

Effects of temperature on tensile properties and deformation behavior of the nickel-based superalloy GH4586A have been investigated. The results showed that deforming temperature has no effect on the microstructure of the alloy, while tensile properties are thermo-sensitive. With the increasing testing temperature the strength of the alloy decreased, and the ductility increased. While, the ductility of the alloy decreased weakly at the temperature range of 823 K to 923 K. And the main reason can be considered as the easily-broken of the MC type block carbides due to the stress concentration at the interface between the matrix and carbides to form the micro - cracks during the deforming process.  

Behavior and Mechanisms of Deformation in Intermetallic Compound Al_(66) Mn_9Ti_(25) La

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