过时效和平整对冷轧双相钢板强度、塑性及烘烤硬化性的影响

以低碳Si-Mn系冷轧双相钢为研究对象，探讨了过时效和平整工艺对双相钢板力学性能的影响。发现：过时效温度高于350℃左右时屈服强度和屈强比大幅度提高并出现屈服平台；平整对双相钢力学性能的影响也与过时效温度有关。平整和过时效均对双相钢的BH值有较大影响。过时效温度过高或者双相钢的BH值很低，不施加任何平整和预拉伸的情况下，双相钢的BH值很小。300℃以下温度过时效后进行平整和预拉伸有利于获得较高的BH值。     

Bake Hardening of Hot Rolled Multiphase Steels under Biaxial Pre‐strained Conditions

Multiphase steels show a strong bake hardening effect being of importance for shaping of car body structural parts. The raised yield strength is exploited for improved crash resistance. Especially the automotive industry has a growing interest in using this effect. Normally the bake hardening effect is examined in tensile tests whereas under industrial conditions shaping of structural parts shows a wide spread of stress strain behaviour, from uniaxial conditions over plain strain to biaxial ones. So it is obvious that the bake hardening behaviour of a material cannot be described with results of the uniaxial tension test only. To give a first answer to this question, the dependence of the bake hardening effect on different biaxial prestrains was investigated for several hot rolled multiphase steels using various baking temperatures and holding times whereas the bake hardening effect under uniaxial prestrain had already been examined in [5]. Considering the choices to generate biaxial strain, a Marciniak forming tool with a diameter of 250 mm mounted on a 2500 kN hydraulic press was chosen. For control of plastic deformation and adjustment the non‐contact measuring system ARGUS, was used. To reduce the quantity of experiments “Design of Experiments” and statistical methods were applied for a martensitic steel, a dual phase steel, a complex phase steel, a ferrite‐bainite steel, and a retained austenite steel known as TRIP, all in hot rolled condition. As a result, a formula for yield stress, tensile strength and residual deformability was developed. Furthermore, a method was found to predict easily whether a steel under investigation is qualified for additional experiments in regard to bake hardening or more exactly its response to different baking temperatures and holding times.     

优先开发和发展粉煤灰轻集料

系统介绍了国内外粉煤灰轻集料的生产方法和主要指标，并与粘土陶粒进行了比较，认为粉煤灰轻集料的生产、应用和发展前景更好，经数年调整、开发和市场竞争，必将成为我国人造轻集料市场的主导产品。     

铝合金建筑型材粉末涂料静电喷涂

在金属表面处理技术中，粉末涂料静电喷涂技术发展较晚，但与阳极氧化着色技术相比有许多优点，很有发展前途。本文介绍用在铝合金建筑型材上的这种技术的原理，工艺，所需设备及其检验等有关事项。     

Some Strengthening Methods for Austenitic Stainless Steels

Austenitic stainless steels possessing good corrosion resistance have recently found growing applications as a constructional material. In this instance, increasing strength properties, which are typically quite low, is of great interest. Due to the low stacking fault energy, strain hardening of alloyed austenite is efficient for increasing tensile strength without impairing ductility seriously. In addition, certain grades are unstable, so that cold working creates strain‐induced martensite that enhances strengthening. Grain size refinement to micrometer scale or even finer can also increase the yield strength, still providing good ductility. In the present paper dislocation and phase transformation strengthening and thereby properties achievable in temper rolled austenitic stainless steels are discussed. Strengthening by the reversion annealing is also described and excellent results achievable are shown. Finally, the effect of bake hardening through the static strain ageing is presented. Long‐term research work in various projects indicates that the current knowledge of strengthening of austenitic stainless steels is close to the industrial utilisation.     

Ti处理的ELC-BH钢板的析出物研究

采用透射电镜研究了Ti处理的超低碳强度烘烤硬化钢板（简称ELC－BH钢板）的析出物，结果表明：在Ti处理的ELC－BH钢板中，不仅有两种类型的硫化物析出，即TiS和Ti4C2S2，而且有（Fe,Ti,P)粒子析出；二相粒子的析出顺序基本上：TiS,TiN-MnS,Ti4C2S2-TiC,(Fe,Ti,P),Ti加入量的确定应考虑它与N,S，C，Fe,P相结合的现象。     

不等厚ULC-BH钢激光拼焊接头硬化机制

采用两种激光光斑加热位置,对不等厚超低碳烘烤硬化钢板进行激光拼焊,分别测定拼焊接头的显微硬度,对比分析其组织性能差异,探讨热影响区硬化软化机制.结果表明,光斑偏向厚板时,拼焊焊缝两侧组织硬度曲线较为对称;在焊接热循环作用下,热影响区基体中饱和科特雷尔(Cottrell)气团析出细小弥散的NbC等第二相颗粒,使得热影响区强硬化;光斑置中时,容易使薄板热输入过渡,析出的第二相颗粒聚集长大,热影响区重新软化,容易导致冲压时开裂.     

磷酸盐无机粘结剂自硬砂硬化强度及型砂存放稳定性影响因素研究

磷酸盐自硬砂存放稳定性差,本文在实验的基础上分析了磷酸盐无机粘结剂成分,固化剂加入量及环境湿度对自硬砂硬化强度及强度稳定性的影响,结果表明,经过含镁物质改性的粘结剂,其自硬砂在高湿度下的抗吸湿性明显改善,但低湿度下,固化剂加入量较高时,存放稳定性差。为保证在各种湿度环境下砂型均具有较高的硬化强度且具有良好的存放稳定性,粘结剂含起改性作用的成分M且保持固化剂加入量较低是必要的。     

Strain Limit of Extra Galvannealed InterstitialFree and Bake Hardened Steel Sheets Under Different Stress Conditions

The formability of bake hardened steel （thickness 0.82 mm）, and the extra galvannealed IF steel （thickness 0.82 mm） have been studied. The suitability of the above steels for forming applications has been critically examined. The microstructure, tensile properties, and formability parameters of the above sheet metals were determined. The manufacturing process of the steels and the significance with reference to its formability were studied.