共查询到16条相似文献,搜索用时 78 毫秒
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着重研究了TA5钛合金锻造工艺对组织与性能的影响.采用二次真空熔炼熔铸的α/α+β转变温度为990~1 000℃的TA5钛合金,在β相区开坯,经多火次中间锻造后,对其最后一火次的锻造,改变锻造温度和变形量共8种工艺方案进行实验,考察锻造温度和变形率对组织和性能的影响.结果表明:①最后一火次在970℃(α相区)锻造变形,得到的组织为等轴α组织,在1 020℃(β相区)变形得到的组织以粗大的片状α组织为主;②锻造变形率对TA5钛合金的拉伸性能影响不明显;③锻造温度对冲击韧性aK影响较大,成品锻造在β相区变形的aK值均高于α相区的水平. 相似文献
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研究了TA5合金板材的加工、退火及热矫形工艺对组织和力学性能的影响。结果表明:板坯第2火次锻造在相变点以上150℃变形,造成板材组织粗化,呈纤维状,强度非常高,塑性变化不大;换向轧制的板材组织均匀等轴化,再结晶晶粒尺寸增加,强度显著降低,塑性明显升高;随着精轧温度的升高,再结晶晶粒均匀化长大趋势明显,板材强度降低,塑性升高;为了避免热矫形过程对板材组织性能的影响,退火温度应高于热矫形过程中的料温;板材经过二次或三次热矫形后,不平度可达到(2~3) mm/m,室温力学性能基本不变。 相似文献
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本文主要研究了杂质元素N、O、Fe含量对TA15钛合金力学性能的影响,并通过光学显微镜、透射电镜等实验手段对不同杂质成分的微观组织进行了研究分析。研究结果表明:随着杂质N、O、Fe含量的增加,TA15钛合金的室温拉伸、高温持久均得到提高。在微观组织上,不同杂质含量的组织形貌、结构有一定的差别。 相似文献
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在实验室范围内制备了一种适用于汽车内板的Al-Mg合金材料。对厚度为6mm的热轧板采用不同的冷轧及退火工艺得到了1mm厚的板材。通过阳极覆膜和拉伸试验等方法系统研究了材料的显微组织和力学性能,并计算得到了材料的成形性能参数,包括平均应变硬化指数,平均塑性应变比和极限拉深比。结果表明:总压下率一定时,采用一次冷轧压下量为33.3%、二次冷轧压下量为75%的冷轧工艺可以得到较高的强度和较优的成形性能。在350~450℃的温度范围内,合金在450℃最终退火后表现出较好的成形性能。所得结果对此材料的实际应用有较大指导作用。 相似文献
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NiAl(Fe)合金组织和拉伸性能的研究 总被引:1,自引:0,他引:1
采用光学显微镜、扫描电镜(SEM)、透射电镜(TEM)、电子探针(EPMA)、X射线(XRD)和选区电子衍射分析(SAED)研究了NiAl(Fe)合金的显微组织及拉伸性能。结果表明,铸态NiAl(Fe)合金经均匀化退火后的组织由β及β+γ'相组成。韧性相γ'相能阻止裂纹扩展,有利于改善合金的室温塑性。比较发现,Ni50Al20Fe30合金具有最佳的室温塑性,其拉伸断口由β相的解理断口和β+γ'相的 相似文献
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Microstructure and mechanical properties of TA15 titanium alloy under multi-step local loading forming 总被引:3,自引:0,他引:3
In this paper six different local loading processes were proposed to study the effects of local loading conditions (temperature, deformation degree, loading pass, heats, cooling modes and heat treatment) on the microstructure and mechanical properties of TA15 titanium alloy workpieces including room and high temperature tensile properties, impact property, fracture toughness and high temperature duration property.It is found that it is better to finish the local loading forming in one heating time, if multi-fire forging needed the optimal forging technique as follows: adopting conventional forging (950 °C) at first and then following near-beta forging to control the proportion of the equiaxed primary α phase and the transformed β phase, allocating deformation degree of each loading pass rationally and using WQ cooling mode. Thus the workpiece with good compositive mechanical properties can be obtained. 相似文献
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采用IPG光纤激光器对8 mm厚的TA5钛合金进行激光自熔焊接,并对焊接接头的微观组织和力学性能进行分析。结果表明,激光焊接接头表面成形连续、均匀、无飞溅,内部无气孔和裂纹等缺陷。母材组织为细小均匀的等轴α相;焊缝区组织主要由粗大的β柱状晶粒、大量的针状马氏体α'以及少量的板条马氏体组成;热影响区组织主要由等轴α相、少量的针状马氏体α'和少量的残余β组成;在熔合线的边界,柱状晶粒与等轴晶粒联生结晶、外延生长,保证了焊接接头的稳定连接。焊接接头各区域的显微硬度差异较大,最高硬度出现在熔合线附近,焊缝区和热影响区的显微硬度明显高于母材的。对拉伸断裂部位进行观察,拉伸断裂发生在远离焊缝的母材处,这说明激光焊接接头的抗拉强度与母材等强或者略高于母材的,这与大量针状马氏体形成的网篮组织有直接的关系。 相似文献
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Microstructure evolution of the transitional region in isothermal local loading of TA15 titanium alloy 总被引:1,自引:0,他引:1
The microstructure of the transitional region determines the performance of TA15 component under isothermal local loading forming. To understand the characteristic of microstructure evolution in transitional region, a set of analogue experiments for isothermal local loading were designed and carried out to investigate the microstructure development under different temperatures and complex strain path. It is found that the isothermal local loading does not change the microstructural composition of TA15 alloy with initially equiaxed microstructure in the transitional region, though a small fraction of lamellar α phases appear at temperatures above 950 °C due to reheating and small deformation in the second loading step. Recrystallization takes place in the β matrix but not in the primary equiaxed α phases. The β grains are fine and equiaxed irrespective of strain path due to recrystallization. The existence of lamellar α refines the β grains. Kinked and disordered primary equiaxed α phases are produced under complex strain path. The grain size of primary equiaxed α phases increases slightly due to static coarsening and strain induced grain growth in multi-heat processing. The volume fraction of primary equiaxed α phases is not influenced by strain path but determined by working temperature. 相似文献