固溶温度对S32750双相不锈钢低周疲劳性能的影响

通过OM观察、电子背散射衍射技术、显微硬度测试、拉伸及疲劳试验研究了5种固溶温度试验钢的组织形态及低周疲劳性能。结果表明,当固溶温度由1 050℃升至1 180℃时,试验钢屈服强度与抗拉强度分别提升41、31.5 MPa,低周疲劳寿命延长85%。随着固溶温度的升高,试验钢中α相含量由46.5%升至58.9%,也导致两相内主元素发生再分配,α相内Ni、N含量的增加,使其显微硬度由300提升至324,这是试验钢疲劳寿命提高的原因之一;其二,随着固溶温度的升高,α相内的局部取向差减小,使α相在循环过程中能承受更多载荷,进而提高试验钢低周疲劳寿命。     

Ti-50.8%Ni合金的类金属电磁特性

研究TiNi合金的宏观电磁性质与微观电子态的关系. 由TiNi合金样品的霍尔效应实验得出样品的霍尔系数为9.6×10-6 Ωm·T~(0.1). 由霍尔系数求得电子浓度n为6.5×10~(23)/m~3, 比金属电子浓度n的值小5个量级, 电学性质比金属弱得多. 而磁性测量得出TiNi合金中有很少的铁磁性晶粒, 但铁磁相很弱, 顺磁相为主相. 样品的表观顺磁磁化率为χ=(2.55±0.01)×10~(-4)(SI), 实际的顺磁磁化率的数值为4.3×10~(-4)(SI), 比金属的Pauli顺磁磁化率的数值大一个量级. TiNi合金与金属相比, 电性弱而磁性强. 电磁实验结果证明TiNi合金未满的3d与4s电子杂化后成为巡游电子, 与金属的公有化电子相比, 它们的载流能力减弱, 而局域磁性增强.     

Effects of Changes in Chemistry on Flex Bending Fatigue Behavior of Al-Based Amorphous Alloy Ribbons

The effects of changes in composition on the flow behavior and flex bending fatigue behavior of a series of Al-Gd-Ni-X (X?=?Fe or Co) amorphous alloy ribbons have been determined at 1?Hz at room temperature. It has been shown that the addition of Fe, Co, and Fe/Co combination into these materials increases the strength, T _g, and T _x1 in addition to the activation energy for crystallization. The lowest strength (i.e., 880?MPa) base alloy Al₈₇Gd₆Ni₇ exhibited the best low-cycle fatigue (LCF) and worst high-cycle fatigue (HCF) behavior, whereas the higher strength alloys (~1100?MPa) Al₈₅Gd₆Ni₇Fe₂ and Al₈₅Gd₆Ni₇Fe₁Co₁ exhibited worse LCF and better HCF behavior. The ratio of the stress amplitude at the fatigue limit at 1?×?10⁶ cycles to uniaxial failure strength ranged from 0.25 to 0.37 (240 to 397?MPa), much higher than conventional aluminum alloys. These results are also compared with those obtained on other amorphous alloy ribbons.     

High Temperature Low Cycle Fatigue Behavior of GH4742 Alloy

High temperature low cycle fatigue tests on GH4742 superalloy were studied under the total strain-controlled conditions at 650℃.Combined with fatigue test data,fatigue properties of the alloy were analyzed.Fracture morphology and dislocation structure were observed by scanning electron microscopy and transmission electron microscopy.The results showed that fatigue life and fatigue resistance of GH4742 alloy decreased significantly with increasing total strain amplitude.The cyclic hardening,cyclic softening and cyclic stability phenomena of the alloy occurred during the low cycle fatigue process.The increasing total strain amplitude is conducive to the formation ofγ′phase.Fatigue crack propagation is controlled jointly by ductile and brittle fracture.Inhomogeneous deformation and deformation restricted in slip bands are the main reasons for the reduction of fatigue life of GH4742 alloy.     

Low Cycle Fatigue Behavior and Cyclic Softening of P92 Ferritic-martensitic Steel

The low cycle fatigue(LCF)behavior of P92 martensitic steel was investigated under different controlled strain amplitudes at room and high temperatures(873K).The cyclic stress responses at all temperatures and strain amplitudes exhibited obviously rapid softening behavior at the early stage of fatigue life,and there was no saturated stage at high temperature.The fracture surfaces of the fatigue samples were observed by scanning electron microscopy(SEM)and optical microscopy.It was shown that crack initiation and propagation occurred transgranularly at both testing temperatures.A typical character was the high density crack branches or secondary cracks along fatigue striations at high temperature,which initiated from the oxidized inclusions and grain boundaries.Further investigation by transmission electron microscopy(TEM)showed that the softening behavior was attributed to the microstructure evolution during fatigue life,such as annihilation of dislocations and migration of martensite laths as well as carbide coarsening,especially for samples tested at high temperature.     

Ti-35Nb泡沫合金的单向压缩力学行为和疲劳特性

采用粉末冶金法制备出Ti-35%Nb泡沫合金,并对该泡沫合金的显微组织,静载力学行为和疲劳特性进行了研究.所制备的泡沫合金组织主要由β-Ti组成,孔洞分布均匀,开孔率高,其压缩曲线表现出典型的开孔泡沫材料的变形特征,孔隙率为66%的TiNb泡沫合金的平台应力约为56 MPa,其疲劳强度是15.1 MPa(疲劳寿命N=1×107).疲劳断口分析结果表明微孔和宏孔连接处是容易产生裂纹的地方,裂纹是以塑件疲劳裂纹扩展方式扩展,最终引起了单个孔壁的断裂,从而载荷传递给相邻的孔壁,加速了整个泡沫材料的整体断裂.     

Ti-5523钛合金热变形流变行为的研究

采用恒应变速率高温压缩模拟实验,对Ti-5523钛合金在应变速率为0.001～5.0 s-1,变形温度为600.900℃条件下的流变应力行为进行了研究,计算了变形激活能及相应的应力指数,建立了合金的应力.应变关系方程.结果表明:在恒温条件下,合金的流变应力随应变速率的增大而增大;在恒应变速率条件下.合金的流变应力随温度的升高而降低;变形激活能和应力指数分别为Q=317.811 kJ·mol-1和n=4.43;可用包含Arrhenius项的Zener-Hollomon参数描述Ti-5523钛合金高温塑性变形时的流变行为.     

340MPa级热镀锌高强低合金钢的疲劳性能

 采用拉-拉疲劳试验研究了厚1.75mm的340MPa级热镀锌高强低合金钢的疲劳断裂行为,绘制了其S-N曲线,并采用扫描电镜对其疲劳断裂特征进行了分析。结果表明,340MPa级热镀锌高强低合金钢在应力比为0.1,加载频率为15Hz的条件下的疲劳极限为190MPa,其疲劳裂纹源位于表面处,疲劳断口靠近裂纹源处锌层破坏不明显,瞬断处锌层破坏明显。     

Influence of Secondary Cyclic Hardening on the Low Cycle Fatigue Behavior of Nitrogen Alloyed 316LN Stainless Steel

In this article, the occurrence of secondary cyclic hardening (SCH) and its effect on high-temperature cyclic deformation and fatigue life of 316LN Stainless steel are presented. SCH is found to result from planar slip mode of deformation and enhance the degree of hardening over and above that resulted from dynamic strain aging. The occurrence of SCH is strongly governed by the applied strain amplitude, test temperature, and the nitrogen content in the 316LN SS. Under certain test conditions, SCH is noticed to decrease the low cycle fatigue life with the increasing nitrogen content.     

Influences of Yttrium on Cyclic Oxidation Behavior of Fe-Cr-Al Alloy

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