离心球墨铸铁管的组织及退火工艺研究

从大型离心球墨铸铁管上取样，用光学金相、电子金相法研究了铸造和不同退火状态下的离心球墨铸铁的组织，实行了低温退火新工艺。研究表明，采用低温退火，使片状珠光体转变为粒状珠光体，并且控制粒状珠光体量为15%-25%，其余为铁素体 石墨，具有良好的综合力学性能。     

Nb在铸铁中的物理冶金学作用原理

介绍了Nb在铁基合金中的存在形式,根据NbC和NbN在不同铁基合金中的溶度积公式,分析了Nb在铸铁中的存在形式。在此基础上,分析了Nb在铸铁中的作用机理。固溶Nb具有非常重要的调节共析相变及强化铁素体基体的作用,凝固过程析出的Nb（C,N）可显著提高耐磨性,在奥氏体温度区间晶界析出的Nb（C,N）能有效阻止晶粒长大,合适的成分设计和工艺措施可充分发挥Nb的作用效果。     

超细晶过共析钢的纳米球状珠光体转变

过共析钢在奥氏体化温度下加热后空冷或炉冷将会产生片状珠光体组织和网状渗碳体,在超细晶条件下得到了不遵循这一规律的固态相变新现象。本实验采用高能球磨快速烧结方法制备了超细晶过共析钢块体试样,通过控制球磨时间控制烧成试样晶粒度。结果表明：当球磨时间超过40 h,烧结后试样晶粒细化到2～4μm的量级,试样空冷无法得到片状珠光体,经共析转变得到纳米级球状渗碳体和铁素体组织,渗碳体球的尺寸在10～100 nm范围。热力学分析表明,晶粒细化导致原奥氏体中碳化物形核率增加,尺寸较小的粒状碳化物相对于片状碳化物具有更大的形核动力;动力学分析表明,晶粒细化导致钢中碳扩散速度提高,层片状珠光体的长大受到抑制,共析转变中珠光体更易长成为粒状。     

膨胀珍珠岩敏化的乳化炸药爆速试验研究

文章分析了乳化炸药的膨胀珍珠岩敏化机理，通过对爆速测试，主要研究膨胀珍珠岩敏化的乳化炸药的密度，膨胀珍珠岩含量，复合敏化剂等因素对乳化炸药爆速的影响，并对构成复合酶化剂的各组分对乳化炸药焊速的影响程度进行了显著性分析。     

The effects of alloying elements on tensile strength and the occurrence of delamination in cold-drawn hyper-eutectoid steel wires

The effects of alloying elements and initial interlamellar spacing on tensile strength and the occurrence of delamination in cold-drawn hyper-eutectoid steel wires were investigated under equivalent drawing conditions. The initial interlamellar spacing showed little influence on the occurrence of delamination. The addition of Cr effectively increased attainable tensile strength, since the added Cr not only increased tensile strength but also delayed delamination. The addition of Ni also increased attainable tensile strength, since the effect of the added Ni on delaying delamination prevailed over the tendency to decrease tensile strength and work hardening. The addition of Cr increased the attainable tensile strength more effectively than the addition of Ni in cold-drawn hyper-eutectoid steel wires, although the added Ni markedly delayed delamination-associated strain.     

Modeling of Austenite Decomposition in Low SiMn TRIP Steel During Cooling

Transformation behavior in low carbon SiMn TRIP steel was investigated by means of microstructural observation and computer modelling. A transformation model in which transformation is controlled by carbon diffusion was suggested, which well described the volume fractional change of ferrite, pearlite, and bainite during continuous cooling. The influence of Si content and austenite grain size was thoroughly investigated. The calculated results indicated that Si retards pearlite transformation, accelerates polygonal ferrite transformation, refines the austenite grain, and increases the ferrite transformation rate.     

Mn13Mo1钢C曲线的测定

用金相法测定了Mn13Mo1钢等温转变曲线。结果表明Mn13Mo1钢的等温转变产物与普通高锰钢一样,也仅是碳化物和珠光体。但高锰钢中加入1％Mo强烈推迟珠光体转变,并且对700℃以下碳化物的析出,也有明显的抑制作用。Mn13Mo1钢的珠光体转变和碳化物析出,都是首先在晶界处发生的。珠光体是极细的;晶内析出的碳化物形态与转变温度有关。600℃以上析出的晶内碳化物为块状;600℃以下析出针状的晶内碳化物。     

高蒙粉膨胀珍珠岩外复合墙试点建筑研究

高蒙粉膨胀珍珠岩制品是一种地方保温产品，将其用于复合墙体，可满足节能标准的要求。试点建筑采用该墙体与普通砖墙进行比较，测试结果表明：复合墙体可节能２０％￣３０％，减轻墙体自重，节能投资回收期小于１５年。     

膨胀珍珠岩缓冲衬垫发泡机理研究

发泡机理是制定成型定型工艺的主要依据.通过大量的试验观察,分析了膨胀珍珠岩缓中衬垫发泡成型定型过程中经历的3个阶段,即气泡核形成、气泡核长大和泡体固化定型过程.实验结果表明,膨胀珍珠岩缓冲衬垫的气泡长大是在黏合剂失去一定的水分、其黏度逐渐增加的条件下才得以实现.控制好发泡剂分解时刻、分解速度与料浆的黏度相匹配,是制备优良性能衬垫的关键.     

Steelmaking in India – new evidence from microscopic and archaeometallurgical analysis from middle Ganga plain,Balirajgarh

The present study deliberates on the archaeometallurgical examination of 2300 years old excavated iron nail from India's middle Ganga plain of Balirajgarh. The nail was subjected to multianalytical investigations in order to determine the raw materials used, manufacturing technology and preservation state. The combined analytical techniques optical microscopy, scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDX), Vickers hardness and X-ray diffractometry shed light towards the characterisation and use of the iron artefact. Special attention was paid for qualitative and quantitative analysis of slag inclusions, metal matrix and corrosion products. The presence of heterogeneous microstructure and inclusion of impurities suggests that nail has been produced through the direct process and work hardened. The noncorroded nail is made of hypereutectoid steel and used for building purpose. The study is important to understand the role of technology in the evolution of cultural changes in India that also provides archaeometric data on the method used in the forging work.