多无限远目标模拟装置光轴共面测试技术研究

提出一种基于激光准直五棱镜回转扫描和CCD技术的非接触检测方法,通过检测三块立板平面度来实现对多无限远目标模拟装置光轴共面度的高精度非接触测量。给出误差评定方法,同时对仪器精度进行分析,通过实验测得共面度为0.039mm,满足精度要求。     

冶金过程对齿轮钢窄淬透性的影响与控制

采用电炉炼钢短流程生产20CrMnTiH工艺,对影响淬透性的冶金因素进行分析,发现工艺过程对化学成份控制精度的影响因素并进行研究优化,建立电炉短流程生产齿轮钢20CrMnTiH子钢号工艺模型,加强从加料到精炼全过程控制,确保产品成份。     

偏心底电炉+LF炉冶炼不锈钢、阀门钢工艺研究

分析不锈钢和阀门钢生产中的技术难题,针对对超高功率偏心低电炉+LF炉工艺生产不锈钢和阀门钢工艺提出技改方案.试生产表明,该方案且冶炼时间短,电耗低,适应性强,且脱C效果优.     

梁柱节点刚度对无支撑钢框架性能的影响

采用有限单元法对不同层数及跨数的无支撑钢框架进行了单向和循环加载有限元分析与对比,研究了梁柱节点刚度大小对框架的抗侧刚度、屈服荷载、屈服位移、滞回性能、破坏模式等性能的影响。结果表明:随着节点转动刚度的逐渐降低,框架侧向刚度减小,侧移增大,框架柱脚很容易率先屈服,梁端很难形成塑性铰,导致结构耗能能力降低;节点刚度达到106kN.m/rad时,框架性能与理想刚接基本一致,可以看成刚性连接框架;节点刚度小于103kN.m/rad时,可以看成铰接框架;节点刚度介于103～106kN.m/rad时则属于半刚性连接框架,节点柔性对结构性能的影响不可忽略。     

Ti-Fe粉对颗粒增强45钢基表面复合材料复合层质量及组织的影响

介绍了将SHS原位合成与V-EPC铸渗相结合的方法制备TiC+Al2O3颗粒增强45钢基表面复合材料的显微组织.研究了不同的Ti-Fe粉加入量对表面复合层质量及组织的影响.研究发现:Ti-Fe粉的加入有助于改善表面复合层质量,随着Ti-Fe加入量的增多,组织致密性、均匀性逐渐得到改善;但当Ti-Fe粉增至45%时出现反应不彻底的现象;复合层组织主要由铁素体、Al2O3和TiC组成;靠近基体的复合层组织致密、均匀、硬度较高,复合层表层组织疏松.     

钢卷包装用新型纸护角和防锈纸护角的特点以及宽幅气相防锈纸的特点

新型L型纸护角是由牛卡纸和多层纱管纸经多道滚轴压合胶粘,再经护角机定型压制而成．护角成90°角,表面光滑平整,主要用于钢铁包装内层,可防止钢材边角划破外层防锈纸,增强包装物边缘支撑力和保护其整体包装强度．在底面沿纵向间隔设置三角形开口,使得本产品既可成直条形,用于金属板材棱边的包装护角,又可弯曲,用作不同直径金属卷筒外圆及内孔棱边的圆形护角．一物两用,提高了其通用性．也节省了原材料．     

核电SA508-3钢在不同冷速下的显微组织

针对由某公司生产首次应用到核电上的SA508-3钢,采用膨胀法在Gleeble1500D热模拟机上测定了其焊接连续冷却转变的膨胀曲线,结合显微组织和硬度,获得了每个冷速下对应的相变点温度.结果表明,在0.015～0.05℃/s冷速范围内.为高温转变的铁素体和珠光体区,0.1～7℃/s冷速范围内,为中温转变的贝氏体区,20～80℃/s的冷速范围内,为低温转变的马氏体区;随着冷却速度的增大,硬度值也越来越大,0.015℃/s对应的硬度值为199 HV,80℃/s对应的硬度值为546 HV,这为制定合理的焊接工艺提供了依据.     

Numerical simulation on the microstress and microstrain of low Si-Mn-Nb dual-phase steel

According to the stress-strain curves of single-phase martensite and single-phase ferrite steels,whose compositions are similar to those of martensite and ferrite in low Si-Mn-Nb dual-phase steel,the stress-strain curve of the low Si-Mn-Nb dual-phase steel was simulated using the finite element method(FEM).The simulated result was compared with the measured one and they fit closely with each other, which proves that the FE model is correct.Based on the FE model,the microstress and microstrain of the dual...     

辽宁地区农村住宅的节能研究

针对我国辽宁地区现有农宅普遍存在的采暖能耗高而居住热环境差的问题,通过对农村住宅的体型系数、平面节能设计、围护结构等方面进行充分分析,提出适合辽宁农村住宅的保温节能措施,从而增强农宅保温隔热能力,提高室内热舒适度。力求使辽宁农村住宅在经济、技术和节能方面均达到新农村建设的要求。     

Effects of chromium on the corrosion and electrochemical behaviors of ultra high strength steels

The effects of chromium on the corrosion and the electrochemical behaviors of ultra high strength steels were studied by the salt spray test and electrochemical methods. The results show that ultra high strength steels remain martensite structures and have anodic dissolu-tion characteristic with an increase of chromium content There is no typical passive region on the polarization curves of an ultra high strength stainless steel, AerMet 100 steel, and 300M steel However, chromium improves the corrosion resistance of the stainless steel re-markably. It has the slowest corrosion rate in the salt spray test, one order of magnitude less than that of AerMet 100 and 300M steels. With the increase of chromium content, the polarization resistance becomes larger, the corrosion potential shifts towards the positive direction with a value of 545 mV, and the corrosion current density decreases in electrochemical measures in 3.5wr% NaCl solutions. Because of the higher content of chromium, the ultra high strength stainless steel has a better corrosion resistance than AerMet 100 and 300M steels.