Y.Umakoshi
,
T. Nakano and H .Y. Yasuda (Department of Materials Science and Engineering
,
Faculty of Engineering
,
Osaka University
,
2-1
,
Yamada-Oka
,
Suita
,
Osaka 565 Japan)
金属学报(英文版)
Plastic behaviour of TiAl polysynthetically twinned (PST) crystals is reviewed to show our knowledge and understanding for receiving a good combination of strength and ductility of two phase TiAl alloys under monotonic and cyclic loading conditions. Anisotropy and mechanism of strength, ductility, toughness. cyclic hardening and fatigue life are described focusing on the effect of lamellar structure.
关键词:
:Fatigue. Deformation
,
null
,
null
K. Mii (Sumitomo Metal Industries
,
Ltd.
,
1-t-3 Otemachi
,
Tokyo 100
,
Japan)M Amano (National Research Institute for Metals
,
1-2-1 Sengen
,
Tsukuba 305
,
Japan)
金属学报(英文版)
The R & D of hydrogen absorbing alloys in Japan started in the early 1970s.Many alloys such as TiMm1.5 based alloys, Fe-Ti-O alloys (e.g. FeTi1.15 O0.024) andthe(mischmetal)Ni5 based alloys (e.g. MmNi4.5 Cr0.46 Mn0.04) were developed by the early 1980s. The application of these alloys to hydrogen storage, heat storage, heat pump, hydrogen purification and motor vehicles has been tried in many iaboratories,and the various techniques for using hydrogen absorbing alloys have been developed.The standarkization of evaluation methods for hydrogen absorbing alloys has been promoted by the Ministry of International Trade and Industry (MITI), and four of them were established as Japanese Industrial Standard (JIS).Alloys for Ni-Metal Hydride batteries have been extensively investigated since 1987in Japun. Mm-Ni-Co-Al-Mn alloys (e.g. MmNi3.55 Co0.75Al0.9Mn0.4) have been devel-oped and commereialized since 1990. The amount of production of small-size Ni-MH batteries in 1995 was about three hundred milliion in number and about one hundred billion yen. The R & D for higher enerpy-density Ni-MH batteries is intensively in progress.MITI and STA (Science and Technology Agency) have promoted the R & D of hydro-gen absorbing alloys in Japan by carrying out the national projects such as Sunshine Program (MITI: 1974-1993) and Utilization of Wind Engeray (STA 1980-1985). The New Sunshine Program (MITI 1993-2020) have started in 1993. This program con-tains the application of hydrogen absorbing alloys to Economical- Enerpy- City System and to We-NET (International Clean Energy System of Technology Utilizing Hydro-gen: World Energy Network.
关键词:
hydrogen absorbing alloy
,
null
,
null
,
null
Hiroshi Takechi Nippon Steel Corporation
,
Japan.
材料科学技术（英文）
This paper reviews recent developments in the contin- uous processing of steels in Japan.The following items are discussed:continuous casting-direct rolling(CC-DR) process of hot-rolled strip:thermomechanical control process(TMCP)of heavy plates:in—line heat treating pro- cess of rails:direct lead patenting(DLP)process of wire rods;and fully integrated processing line(FIPL)of cold-rolled strip.
关键词:
continuous casting
,
null
,
null
,
null
WANG Kai
,
XU Tingdong
,
SHAO Chong
,
YANG Chun
钢铁研究学报(英文版)
The data obtained by bending tests for intergranular embrittlement after 45 h and 450 h exposure to Strauss solution have been reported for 304 stainless steel. The results show that an embrittlement peak appears at 650 ℃ for all samples quenched from 1260 ℃ and then sensitized for 150 h at 480, 565, 650, 730, 815 and 900 ℃ respectively. The temperature corresponding to the embrittlement peak is decreased to 565 ℃ when the sensitizing time is prolonged to 1500 h. In this paper, these data are analyzed with an isothermal kinetic model of nonequilibrium grain boundary segregation, indicating that the embrittlement peak is related to the critical time for nonequilibrium grain boundary segregation of sulfur.
关键词:
stainless steel
,
intergranular corrosion
,
nonequilibrium segregation
,
grain boundary
,
sulfur
詹茂盛
,
方义
,
王瑛
,
范荣峥
航空材料学报
doi:10.3969/j.issn.1005-5053.2000.04.010
在40℃和80℃环境中,分别对Bayer-PC、Japan-PC、Korea-PC三种聚碳酸酯缺口冲击试样进行了热空气老化和热水老化实验研究.在0～400h老化时间内,研究了这三种PC的热空气老化和热水老化对冲击强度和断面形貌的影响,讨论了PC热空气老化和热水老化机理.结果表明:老化前,Japan-PC、Korea-PC和Bayer-PC冲击强度分别为95kJ/m2、83 kJ/m2和55 kJ/m2;在40℃和80℃热空气老化后,三种PC冲击强度均有所下降,其中80℃热空气老化引起的降幅最大,热空气老化400h后的冲击强度顺序为Japan-PC>Korea-PC>Bayer-PC,在40℃热水老化后,三种PC的冲击强度几乎不受老化时间影响;在80℃热水老化后,三种PC冲击强度均有所下降,其中Bayer-PC降幅最小,Japan-PC次之,Korea-PC最大,但PC的平衡冲击强度大小与热空气老化的情况相同.由扫描电镜对冲击断面形貌观察可知,未老化的三种PC均以剪切屈服破坏机理为主,老化后的三种PC主要以银纹集中破坏机理为主.
关键词:
聚碳酸酯
,
热空气老化
,
热水老化
,
破坏形貌
D.Watanabe
金属学报(英文版)
Cost reduction in electric power generation is a major management concern, and it is therefore necessary to reduce maintenance expenses while upholding plant reliability. A maintenance optimization system "FREEDOM", which uses RBM technique, DCF (discounted cash flow) and NPV (net present value) calculation functions, has been newly developed. This system probabilistically evaluates the lifetime of boiler and turbine and quantitatively calculates the risk defined as the cumulative probability of failure multiplied by the consequence of failure. Economically optimized timing of inspection and alternative countermeasure such as repair and replacement are then recommended. This system has already been applied to seven plants in Japan, and its effectiveness has been confirmed.
关键词:
plant asset management
,
null
,
null
Fumin XU
金属学报(英文版)
Two kinds of low carbon bainite materials were developed for fishplate usage. The microstructures and mechanical properties were measured in details. The results showed that one material was composed of fine granular bainite with the yield strength of 722 MPa at room temperature and 738 MPa at -55℃, and elongation percentages of 60.7 % and 41.7 %, respectively. The other one had a meta-bainite microstructure with corresponding strengths of 568.5~MPa and 700~MPa, elongation percentages of 63.5 % and 67.1 %, respectively. These values are all superior to the home-made B7 steel and the fishplate materials made in Japan. The major strengthening mechanisms were discussed and attributed to the solid solution, complex phases, fine grain and dislocation strengthening.
关键词:
Fishplate
毛雪平
,
刘宗德
,
杨昆
,
安江英
,
蒲泽林
钢铁研究学报
在540 ℃和565 ℃下进行了30Cr1Mo1V钢的蠕变试验.用θ函数法对蠕变试验数据进行了处理,给出了这两种温度下的持久强度公式,并将试验结果与文献[1]中30Cr1Mo1V和30Cr2MoV转子钢在相应温度下的持久强度曲线进行了比较.试验结果表明,虽然565 ℃时30Cr1Mo1V钢的持久强度比540 ℃时有较大幅度的下降,但仍然比30Cr2MoV转子钢在538 ℃下的持久强度高.因此,就持久强度方面而言,将30Cr1Mo1V转子钢的使用温度提高到565 ℃是可行的.
关键词:
30Cr1Mo1V
,
蠕变
,
θ函数
,
持久强度
蔡伟
,
魏国方
,
孟凡娜
,
胡静
材料热处理学报
利用光学显微镜、X射线衍射仪、显微硬度计、摩擦磨损试验机研究了304不锈钢在565℃进行60 ～ 180 min盐浴复合处理(QPQ)后对304不锈钢表面组织和耐磨性性能的影响.结果表明,在565℃渗氮时间为150 min时,304不锈钢硬度峰值约为1200 HV,比基体高5倍以上.工件经QPQ工艺处理后试样钢渗层结构由表及里为致密的氧化膜、渗氮层和扩散层,其中渗氮层主要物相为ε-Fe2-3N.耐磨性实验表明,QPQ处理可显著改善304不锈钢耐磨性.在565℃渗氮时间150 min为改善耐磨性的最佳时间,处理后试样的耐磨性比原始试样提高10倍左右.
关键词:
QPQ工艺
,
304不锈钢
,
耐磨性
