Super mechano-systems project

The super mechano-system (SMS) project is the Grand-in-Aid for COE Research Project, which started is April 1997 at the Tokyo Institute of Technology for the Creation of New Functionality by the Fusion of Control and Mechanisms, and is supported by the Ministry of Education, Sciences, Sports and Culture. The project aims to establish a new discipline by the functional integration of advanced technologies in mechanisms and control. This paper briefly describes the SMS project.     

SUPER304H锅炉钢管局部腐蚀分析及其防护对策

对某沿海在建机组锅炉用SUPER304H钢管出现的局部腐蚀进行了宏观形貌、化学成分、金相、扫描电镜及能谱分析结果表明,SUPER304H钢管局部腐蚀的主要原因是由氯离子引起的。对此,建议在SUPER304H钢管海运及存放时,加盖帆布和采用缓蚀剂进行防护。对已产生局部腐蚀的管材进行打磨,并经渗透探伤和壁厚测量检验合格后可正常使用。     

Properties and improvement of super fine grained steel friction welded joint

Abstract

This paper describes friction welded joint properties of super fine grained steel (SFGS) and discusses improvements in these joint properties. The average grain size diameter of the SFGS base metal is ～0·6 μm, and its ultimate tensile strength is 660 MPa. The joint, made by a continuous drive friction welding machine (conventional method), fractured at the welded interface even though it possessed 100% joint efficiency. This was due to both the coarsening of the grain size and the softening of the welded interface with its adjacent region caused by heat input during braking times. The authors developed a joining method using a continuous drive friction welding machine that has an electromagnetic clutch to eliminate heat input during braking time, which was called the 'low heat input friction welding method' (LHI method). The joint obtained by the LHI method had the same tensile strength as the base metal at the friction time when the friction torque reached the initial peak. That is, the joint obtained 100% joint efficiency and fractured at the base metal, although the adjacent region of the welded interface softened only slightly. The grain size of this joint was smaller than that obtained by the conventional method. It was clarified that the optimum friction welded joint of the SFGS could be obtained by the LHI method in comparison with the conventional method.     

Sintering transformations in mixtures of austenitic and ferritic stainless steel powders

Abstract

The microstructural transformations and the dimensional evolution of green specimens obtained by pressing mixtures of austenitic and ferritic stainless steel powders have been investigated by sintering at 1120 and 1240°C. Dilatometry experiments show that the linear shrinkage is influenced by the amount of ferritic powder. Moreover, during sintering Ni diffuses into the ferritic grains causing austenite destabilisation and the formation of a mixed constituent, whose constitution has been investigated by means of EDXS and interpreted on the basis of the Schaeffler diagram. Sigma phase also forms during sintering of the duplex mixtures.     

虚拟仪器技术在SUPER9-XG卷烟机烟支重量控制系统中的应用

阐述虚拟仪器技术的定义作用,从其在SUPER9-XG卷烟机重量控制系统中典型应用了解其功能。     

S30432钢管与T92异种钢焊接接头性能试验研究

通过材质成分、室温及高温短时强度、室温及高温短时塑性、冲击韧性、工艺性能、金相组织检验、力学性能断口检验、时效试验及高温持久性能试验,对S30432钢管与T92异种钢焊接接头的性能进行评价,并与进口SUPER304H钢管与T92异种钢焊接性能进行了比较.结果表明,S30432+T92异种钢焊接性、焊接接头短时性能满足DL/T868-2004、DL/T 751-2001及相关标准要求,与同批制备的进口SUPER304H+T92异种钢接头和日本原装SUPER304H+T92接头的性能相当.     

SUPER304H奥氏体不锈钢晶间腐蚀试验分析和预防方法

为防止SUPER304H奥氏体不锈钢由于具有晶间腐蚀倾向而对锅炉受热面的运行产生威胁,对其进行了采样和试验,避免在超超临界锅炉受热面中使用具有沿晶腐蚀倾向的管材,同时对该种不锈钢的管理和晶间腐蚀预防措施进行了宏观分析和阐述,避免运行中发生晶间腐蚀倾向的诱发因素。     

超级标注软件应用及相关问题的研究

通过三维绘图软件Pro/E 5.0转化成.dwg或.dxf二维图形格式,输出的工程图纸信息资料,均无法实现与对应零部件三维模型的信息相关联.使用“超级标注”软件解决了这一难题.对于在使用“超级标注”软件过程中所遇到的一些问题,如增加零部件视图中辅助线、选取尺寸标注基点、焊接符号指引线丢失以及调整装配明细栏中零件顺序等问题进行研究探讨,提出解决问题的方法,取得较为满意的效果.     

焊缝金属对SUPER 304H奥氏体耐热钢焊接性的影响

综述了焊缝金属对SUPER 304H钢焊接性的影响。结果表明,SUPER 304H钢不同成分GTAW奥氏体焊缝的热裂纹倾向较大;焊缝中凝固裂纹倾向主要是受A凝固模式控制,而HAZ液化裂纹倾向的主要原因则与晶界析出相,以及铜的富集等因素有关。不同成分奥氏体焊缝接头的力学性能各异;合适的焊缝化学成分和优化的焊接工艺是获得满意接头综合力学性能的重要技术手段。不同成分形成的"同质"或"异质"焊缝,其微观组织皆为奥氏体+析出相。熔化焊焊缝为A凝固模式,非熔化焊的摩擦焊焊缝为AF凝固(相转变)模式。     

超超临界机组用SUPER304H炉管局部腐蚀现象分析与对策

通过对某沿海在建超超临界机组用SUPER304H锅炉钢管局部腐蚀的宏观形貌、化学成分、金相、扫描电镜及能谱分析,得出其局部腐蚀的主要原因是氯离子引起的孔蚀,并提出了预防措施,为将来设备维护提供了经验积累。