膨胀珍珠岩——玻璃彩色复合饰面板的研制

本文介绍以膨胀珍珠岩为基层,玻璃为面层,利用玻璃在800℃左右产生烧结复合,形成具有绝热,耐腐蚀和装饰等多功能的复合饰面板的研制.文中从原材料分析入手,对复合饰面板的制作和烧结过程进行了分析和研究,并指出了这种饰面板的应用前景.     

高寒地区节能住宅

简述了高寒地区一种新型节能住宅的设计,这种住宅建筑造价低,易于推广。     

合金化和球化工艺对超高碳钢组织和性能的影响

 研究了合金化和球化工艺对超高碳钢组织和性能的影响。用扫描电子显微镜、透射电子显微镜和能谱仪观察了钢的组织形貌和元素分布。结果表明：在碳和铬含量相同的超高碳钢中加入同量的合金元素铝和硅时,铝可明显抑制锻造组织中网状或粗大的颗粒状碳化物的析出、细化珠光体组织和控制石墨形成。UHCS 213Si和UHCS 261Al钢经850 ℃×3 h球化退火处理后,都能得到较好的球化组织,其力学性能分别为：UHCS 213Si钢,Rm=1 033 MPa,Re=734 MPa,A=149%;UHCS 261Al钢,Rm=973 MPa,Re=677 MPa,A=182%。     

Microstructural Evolution of a Hypoeutectoid Pearlite Steel under Rolling-sliding Contact Loading

To study the microstructural evolution of pearlite steel subjected to pure rolling and rolling-sliding contact loading,a hypoeutectoid pearlite steel with composition and microstructure similar to BS11 was designed and twindisc tests of this pearlite steel were performed to simulate the wheel/rail system.After a series of twin-disc tests,optical microscope(OM)observation,scanning electron microscope(SEM)observation,X-ray diffraction(XRD),and micro-hardness tests were conducted to characterize the microstructure.Under the pure rolling contact condition,a large amount of reticular cracks emerged within 60μm below the contact surface of the samples after 120 000 revolutions.The largest deformation was approximately 200μm below the contact surface.Under the rolling-sliding contact condition,the nodularization of pearlite within 100μm below the contact surface was obvious.The microstructure and stress-strain distribution of the area within 2mm below the contact surface were investigated.The distribution of micro-hardness under the contact surface varied with contact conditions.Finite element method(FEM)was used to simulate the stress-strain distribution.The results of SEM,FEM,and micro-hardness tests indicated that under the pure rolling contact condition,the maximum plastic strain was approximately 200-400μm below the contact surface.Conversely,under the rolling-sliding contact condition,the maximum plastic strain emerged on the contact surface.Under the pure rolling contact condition,the distribution of micro-hardness was almost identical to that of the equivalent plastic strain.Under the rolling-sliding contact condition,the distribution of micro-hardness was affected by the equivalent plastic strain and tangential stress.     

共析珠光体钢在冷轧过程中的组织变化

用SEM、TEM及XRD等方法研究了共析钢中珠光体经40％-90％的冷轧变形后所产生的显微组织变化．接渗碳体形态特点,变形珠光体组织可分为以下3种类型：(1)不规则弯曲片层型,即变形后的渗碳体与轧制面呈大角度偏离且不规则弯曲的珠光体．(2)带有剪切带的粗大片层型,即被渗碳体剪切带分开且变形轻微的珠光体．(3)精细片层型,即与轧制方向平行排列、片间距细小且渗碳体严重变形的珠光体．精细片层区域的比例随着轧制压下率的提高而增大．此外,重度冷轧变形还引起渗碳体严重塑性变形和部分溶解．     

THERMODYNAMIC EXPLANATION OF LEADING PHASE IN PEARLITE TRANSFORMATION

1.IntroductionThedisputationon"leadingphase"inpearlitetransformationislong-standing.UPtonow,manydifferentopinionswhichincludealmosteverypossibility,havebeenpresented[1--4].However,aunanimousconclusionhasnotformedyet.Manymetallurgistspaytheirattentiontothisproblembecauseitisveryinterestinginthefieldofthesolidstatetransformationandithasimportantpracticalsignificancefordevelopingnewhot-workingprocessesandprojectingnewengineeringalloys.Inthispaperanexplanationofthethermodynamicattributiontoleadin…     

Li_2O在烧结型膨胀珍珠岩釉面砖的应用

本文在大量实验的基础上,对烧结型膨胀珍珠岩基釉面砖的釉面裂纹成因进行了探讨,指出了热膨胀系数、坯釉界面作用及坯体强度是其主要影响因素。实验表明,通过在坯中添加Ｌｉ２Ｏ能有效地克服此种缺陷。     

膨胀珍珠岩基复合釉面砖的坯釉适应性研究

采用热膨胀系数测定方法和电子探针元素分析方法,对膨胀珍珠岩基复合釉面砖的坯釉适应性进行了初步研究,指出制品出现釉面裂纹的主要原因,提出了改进措施。     

变形终止温度对GCr15轴承钢显微组织的影响

采用MMS300热模拟试验机对GCr15轴承钢的热变形工艺进行模拟,研究变形终止温度对其显微组织的影响。结果表明,变形终止温度在770~870℃内变化时,其显微组织均为片层状珠光体+沿晶界分布的先共析碳化物,并且先共析碳化物周围存在铁素体薄膜。随着变形终止温度的升高,晶粒尺寸和珠光体团的尺寸均增加,珠光体的片层间距略微减小,硬度增加。通过回归分析获得维氏硬度与片层间距倒数的拟合方程HV=38.3S-1+92.7。变形终止温度在810~870℃内升高时,碳化物的网状程度增加。与810℃相比,变形终止温度为770℃和790℃时,碳化物的网状程度较严重。     

Q235D热轧钢板低温冲击性能不合原因分析及改进措施

针对重钢4 100 mm产线生产的厚度为16～25 mm Q235D热轧钢板低温冲击性能不合问题,通过对钢板化学成分、金相组织和轧制工艺进行分析,发现产生沿晶界呈连续带状分布的珠光体组织,并且同时伴随有混晶现象是导致钢板低温冲击性能不合的主要原因。将精轧终轧温度提高至890～900 ℃,改善了钢板组织形态,获得均匀的组织,提高了Q235D钢板低温冲击性能,满足了标准要求。