光纤的淬冷增强原理

本文从拉丝工艺技术的角度出发，讨论了高速、高温拉丝工艺方法对光纤的淬冷增强原理。     

锅炉压力容器用SA515Gr70钢的组织与性能研究

通过钢的成分的设计，研制了一种用于制造锅炉汽包和压力容器的奥氏体粗晶粒钢，这种钢经一定热处理后，可获得高强度高韧性的使用要求。     

利用"正火液"作为高铬铸铁磨球淬火介质的生产实践

高铬铸铁件在没有添加贵重元素的条件下,利用"正火液"配入适量的水作为淬火介质进行了试验和生产.实践证明,产品在热处理淬火时从未发生炸裂现象,同时完全达到了要求的力学性能指标.生产的锤头其使用寿命为高锰钢的6～8倍,为低铬白口铸铁的4～6倍.     

乙烯装置急冷油系统减粘技术的研究

基于乙烯装置急冷油和急冷系统结垢物的组成分析，探讨了急冷油增粘和系统结垢的机理．研究了适用于急冷油系统的新型减粘剂RIPP-1420和减粘剂的注入技术。结果表明，RIPP-1420减粘剂和该注入技术能有效降低急冷油系统物料的粘度，减少结垢物的生成。     

淬火介质对7055铝合金晶界析出行为的影响

采用透射电镜研究了淬火介质对7055铝合金晶界析出相及无沉淀析出带的影响。结果表明，空气淬火时，合金冷却过程在晶界上析出η平衡相。合金经室温水淬及沸水淬火合金时效后，晶界析出相尺寸差别小，呈链状连续分布；晶界无沉淀，析出带较窄，平均宽度分别约为33nm和43nm。空气淬火合金时效后晶界析出相尺寸差别较大，呈不连续分布；晶界无沉淀，析出带很宽，约102nm。对其原因进行了分析和讨论。     

Computer Simulation of IT-diagrams of Steel

PHASE transformation modeling is one of the mainchallenges in modeling of heat treatment[1].The mechanism of phase transformations is not fullyunderstood and interactive influence of differentelements,austenitizing temperature,etc.usually arenot taken in account.The mistakes in phase transformation calculationcould be extremely great if a model is based only ongrain size of prior austenite,austenitizing temperatureand elemental composition of steel.Phase transformation kinetic depends also o…     

热处理工艺对高速钢轧辊组织和性能的影响

研究了淬火温度、冷却方式、回火温度和回火次数对高速钢轧辊组织和性能的影响。结果表明,空冷的高速钢轧辊淬透性差,油冷的高速钢轧辊易出现裂纹,盐冷的高速钢轧辊具有优良的淬透性,不易出现裂纹,辊面硬度高,硬度均匀性好,耐磨性好。     

电磁振动雾化-速凝镁粉钝化表征研究

用电磁振动雾化-速凝法制备了粒度为0.2～1.0 mm的镁粉,研究了这种速凝镁粉在1 000 ℃的阻燃时间.结果表明,速凝镁粉阻燃时间为17～21 s,而铣削-钝化镁粉阻燃时间为11～14 s.扫描电镜和能谱仪观察和分析发现,速凝镁粉存在表面碳富集,迅速凝固产生的致密表面,增强了粉粒表面的化学稳定性,产生了钝化效果.     

Influences of Ta, Nb, or Mo additions in Zr-based bulk metallic glasses on microstructure and thermal properties

The master-alloy ingots for casting bulk metallic glasses are routinely prepared by arc melting a mixture of pure elements. This paper addresses the difficulty in achieving complete and homogeneous melting of refractory component additions in Zr-based BMGs using the above procedure, and its influences on the microstructure and thermal behavior of alloys.     

High strength and ductility of 34CrNiMo6 steel produced by laser solid forming

Because of the excellent mechanical properties of 34CrNiMo6 steel, it is widely used in high-value components. Many conventional approaches to strengthening-steels typically involve the loss of useful ductility. In this study, 34CrNiMo6 Steel having high strength and ductility is produced by laser solid forming (LSF) with a quenching-tempering (QT) treatment. Tempering of bainite is mainly by solid phase transformation in the previous LSF layers during the LSF process. The stable microstructure of LSF consists of ferrite and fine carbides. The microstructure transfers to tempered sorbite after heat-treatment. The tensile properties of the LSF steel meet those of the wrought standard. The UTS and elongation of LSF sample at 858 MPa, 19.2%, respectively, are greater than those of the wrought. The QT treatment enhanced the ultimate tensile strength and yield strength of the LSF sample. The ultimate tensile strength, yield strength, reduction in area, and elongation of the LSF+QT sample at 980 MPa, 916 MPa, 58.9%, and 13.9%, respectively, are greater than those of the wrought standard. The yield strength of the LSF+QT sample is approximately 1.27 times that of the wrought. The LSF samples failed in a ductile fracture mode, while the LSF+QT samples showed mixed-mode failure. The defects have only a small effect on the tensile properties owing to the excellent ductility of the LSF sample.