HR3C钢焊接接头高温时效后的显微组织和力学性能

通过光学金相显微镜、透射电子显微镜观察和力学性能试验,研究了HR3C钢焊接接头高温时效后的显微组织和力学性能。结果表明,经650℃时效,HR3C钢焊接接头的强度和硬度升高,焊缝硬度上升幅度大于母材;焊缝的时效脆化倾向明显,时效7000 h后缺口冲击吸收能量都保持在15 J以下。焊缝区晶界处M23C6相的连续网状分布及σ相、G相的存在导致了其较低的缺口冲击吸收能量和时效脆性,而晶内均匀细小Z相的沉淀强化作用则提高了接头的强度和硬度。     

T92/HR3C异种钢焊接接头蠕变断裂研究

针对采用手工氩弧焊GTAW打底,手工电弧焊SMAW焊接的T92/HR3C异种钢接头,在USC条件下对接头进行蠕变断裂加速试验,并分析蠕变断口微观形貌,研究结果表明:不同载荷条件下的蠕变断裂的位置不同;T92/HR3C异种钢焊接接头蠕变断裂属于韧窝聚集型韧性断裂;T92/HR3C异种钢焊接接头在大容量超超临界机组(USC)条件下服役是完全安全可靠的。     

镀有高反膜的1/4波片工作特性分析

基于光矢量的琼斯矩阵理论,分析了单面镀有高反膜,另一面镀有增透膜的1/4波片工作特性。结果表明,膜层会引起偏振光在波片内的振荡,从而使波片的通带出现纹波效应。     

MJS802HR喷气纺纱工艺技术及成本效益分析

介绍了喷气纺纱机的主要性能，对喷气纺纱的生产工艺及成本效益进行了分析与研究。     

Analysis of traction‐free assumption in high‐resolution EBSD measurements

The effects of using a traction‐free (plane‐stress) assumption to obtain the full distortion tensor from high‐resolution EBSD measurements are analyzed. Equations are derived which bound the traction‐free error arising from angular misorientation of the sample surface; the error in recovered distortion is shown to be quadratic with respect to that misorientation, and the maximum ‘safe’ angular misorientation is shown to be 2.7 degrees. The effects of localized stress fields on the traction‐free assumption are then examined by a numerical case study, which uses the Boussinesq formalism to model stress fields near a free surface. Except in cases where localized stress field sources occur very close to sample points, the traction‐free assumption appears to be admirably robust.     

Hybrid time and hardware redundancy to mitigate SEU effects on SRAM-FPGAs: Case study over the MicroLAN protocol

SRAM-based field programmable gate arrays (FPGAs) are particularly sensitive to single event upsets caused by high-energy space radiation. Single Event Upset (In order to successfully deploy the SRAM-FPGA based designs in aerospace applications, designers need to adopt suitable hardening techniques. In this paper, we describe novel hybrid time and hardware redundancy (HT&HR) structures to mitigate SEU effects on FPGA, especially digital circuits that are designed with bidirectional ports. The proposed structures that combine time and hardware redundancy decrease the SEU propagation mechanisms among the redundant hard units. Analysis results and fault injection experiments on some standard ISCAS benchmarks and MicroLAN protocol, as a case study over the bidirectional ports, show that the capability of tolerating SEU effects in HT&HR technique increases up to 70 times with respect to solely hardware redundant versions. On average, the proposed method provides 39.2 times improvement against single upset faults and 14.9 times for double upset faults; however it imposes about 14.7% area overhead. Also, for the considered benchmarks, HT&HR circuits become 8.8% faster on the average than their TMR versions.     

地球物理勘探人力资源管理的成功ｅ化

人力资源作为企业的重要战略资源，已逐渐为企业经理们所认可，应用IT技术的人力资源管理信息系统也在不断涌现。但如何把现代企业人力资源管理理念和当前IT技术最新进展相结合，建立一个全新的人力资源管理系统，一直是人力资源管理系统开发过程中的重要问题。针对物探行业特点，从全球人力资源共享的角度来分析现代企业人力资源管理问题，阐述如何应用最新智能电子商务建设技术如web服务等开发人力资源管理信息系统，并通过管理信息系统开发实践，推出了e RFHRMS人力资源管理系统。     

热等静压温度对V-4Cr-4Ti/HR2钢连接界面及性能的影响

以AuNi合金作为过渡层材料,采用热等静压(HIP)方法进行V-4Cr-4Ti/HR2钢(SS)扩散连接.利用扫描电镜(SEM)、能谱仪(EDS)及剪切试验分析了接头的扩散层显微组织、微区成分和力学性能.研究表明:采用AuNi过渡层材料,能够实现V-4Cr-4Ti/HR2的扩散连接;HIP温度为850℃时,接头质量良好,其剪切强度为39MPa;V、Fe、Ni等主要元素的平均扩散深度为20μm左右;在SS侧,扩散层较为均匀,在V-4Cr-4Ti侧,形成了Au的富集层和NixVy的富集层,两层呈相互交替的层状分布.     

HR3C钢管时效冲击韧性大幅降低的原因分析

借助于热处理炉和冲击试验机、扫描电镜和透射电镜等设备,分析了HR3C钢管时效后冲击韧性大幅度降低的原因.分析结果表明,时效过程中于晶界上析出了大量的第二相和杂质元素因降低了晶界断裂能而致使冲击韧性大幅度降低是其主要原因.     

HR3C不锈钢时效过程中铌的析出规律及其对性能的影响

通过金相、SEM、EDS、TEM、电化学分析及硬度测量的方法,研究了固溶处理HR3C不锈钢在800℃加速时效不同时间后,含铌析出相的种类、数量和形状大小及其对性能的影响。结果表明,HR3C中主要的析出相为MX相和Z相(NbCrN)。随着时效时间的延长,析出相尺寸逐渐增大,弥散强化效果先快速增加,后逐渐减弱。Z相的析出能提高HR3C钢的耐晶间腐蚀性能。