Study on Surface Engineering of Normalized Steels Subjected To Machine

Engineering the surfaces of components to improve the life and performance of parts used in automotive and aerospace engineering is the active area of research. Suitable Thermal/Mechanical/Thermo mechanical surface engineering treatments will produce extensive rearrangement of atoms in metals and alloys and corresponding marked variations in Physical, Chemical and Mechanical properties. Among the more important of these treatments are heat treatment processes such as hardening by Quenching, Induction hardening and Case Carburizing which rely on phase transformations to produce desired changes in mechanical properties. Other processes where phase transformation occur are casting, welding and machining etc. [1] Phase transformation may be homogeneous or heterogeneous. Homogeneous involves rearrangements in the structure of the material taking place simultaneously in all parts of the solid, while the heterogeneous transformation involves structural changes which are more localized. Alternatively they could be called as Isothermal and Nonisothermal transformation. But irrespective of the classification, these transformations alter the structure of the material giving rise to changes in the mechanical and physical properties of the processed material. It is of interest to review some consequences of surface modification in isothermal (Normalizing) and nonisothermal transformations (Machining) of low carbon steels.     

提高磷酸二铵产品质量方法浅析

针对磷酸二铵(DAP)产品养分波动大、含水量偏高、易结块、颜色变化大等缺点,在生产过程中采取了相应的解决措施,如配矿、联产、设备改造、工艺指标调整等,使DAP装置不仅保持了原有的优点,而且产品质量问题也得到了有效解决。养分基本保持在64.0%~64.6%,水分下降到2.1%~2.2%,结块现象较少,颜色也比较统一。     

浅谈化工建设项目竣工预验收程序和内容

结合作者的实际工作 ,总结了对工程建设实施“三道质量控制工序”的经验 ,强调了过程质量控制的重要性 ,较为系统地介绍了化工建设项目预验收工作的程序和内容     

用预分解技术改造Φ4×60m预热器窑的又一成功实例

介绍南京水泥工业设计研究院用预分解生产技术对山东水泥厂Φ4×60m预热器窑烧成系统进行的成功技术改造。技改设计指标为：熟料产量保证指标1500t／d，争取指标1700t／d，熟料热耗＜3762kJ／kg，熟料28d抗压强度＞60MPa。整个工程停产施工耗时仅用48d，烧成系统技改共耗资约3000万元。技改后一次点火投料成功，且点火当月即实现72h达标考核，所有设计指标均达标。     

如何提高预焙铝电解槽阳极质量

预焙阳极的质量已严重制约铝电解技术的发展，必须予以足够的重视．国外在提高阳极质量方面的有效措施，可以供国内阳极工厂技术改造及科研攻关借鉴．     

化肥企业质检机构的管理

针对我国化肥生产企业质检机构的现状 ,结合国家相关政策的要求 ,就如何搞好化肥企业质检机构的管理提出了诸多指导性意见     

企业核心竞争力关键要素——质量

介绍了如何体现产品质量及如何控制产品质量。     

Effect of mixing leaves with olives on organoleptic quality of oil obtained by centrifugation

Variable quantities of leaves were added to ripe olives prior to extraction to determine their effect on the quality of the resulting olive oil. The addition of 1–3% w/w leaves improved the organoleptic quality. An increase intrans-2-hexenal aldehyde content occurred, giving the pleasant flavor of “freshly cut grass.” This compound was produced by the enzymatic breakdown of 13-L-hydroperoxide of linolenic acid in leaf homogenates.     

聚合物多元醇产品质量的影响因素与控制

从内在和外在质量两个方面，简要论述了影响聚合物多元醇(POP)产品质量的因素和控制产品质量的措施。