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刘涛 《功能材料与器件学报》1997,3(4):243-248
对Fe-24Mn,Fe-24Mn-6Si成分的粉末混合物进行了机械球磨,并对不同时间的球磨样品进行了X射线衍射(XRD)和Mo¨sbauer谱测量。结果表明,球磨使得Fe、Mn、Si在原子尺度上发生了混合,形成了顺磁性、面心立方结构的Fe-24Mn或Fe-24Mn-6Si纳米晶合金,这是Fe、Mn或Si原子由颗粒表面到体内扩散的结果。球磨67h以后结构未发生变化,表明形成的是一种热力学亚稳结构,这个结果与Fe-Mn和Fe-Mn-Si合金在室温下的相图结构明显不同。 相似文献
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475℃ EMBRITTLEMENT DEVELOPMENT AND EMBRITTLING-INHIBITING MECHANISM BY YTTRIUM IN FeCrAl ALLOYS 总被引:5,自引:0,他引:5
经脆化动力学、内耗、TEM和Mossbauer谱等研究表明:Fe-15Cr-4Al和Fe-25Cr-5Al合金的475℃脆化包括两种过程,碳化物在晶界析出损害界面结合,降低断裂应力、使塑性在时效0.25h后消失,时效温度从400提高到600℃时,发生过时效的时间从〉1000h缩短到约1h,从α相均匀析出的富铬α‘相通过强化基体引起二次脆化,它与时效温度的关系有“C曲线”的特征,作用仅在440 ̄47 相似文献
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研究了Al、Ti、Nb对Fe-28Ni-13Cr-1.2W-1.5Mo高温合金组织和性能的影响。随Ti含量增加,合金的强度提高,但η相的析出倾向及晶界相对于晶内的弱化效应增大,合金的塑性大幅度下降。Al和Nb都明显抑制η相析出,其含量过高时分别导致胞状γ’和Laves相在晶界析出,胞状γ’相使晶界在中高温区严重脆化,Laves相适量析出使晶界在中高温区得到有效强化。 相似文献
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Standards are the basis for production enterprises to organize production ex-factory inspection trade 《中国标准化(英文版)》2008,25(1):24-25
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.…… 相似文献
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Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß. 相似文献
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《中国标准化(英文版)》2014,(4)
正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from 相似文献
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《中国标准化(英文版)》2014,(5)
正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively. 相似文献
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《中国标准化(英文版)》2014,(4)
正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to 相似文献
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刘智洋 《中国标准化(英文版)》2014,(4):M0002-M0002
正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in 相似文献
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《中国标准化(英文版)》2014,(4):3-3
正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration. 相似文献
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《中国标准化(英文版)》2014,(4)
正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions. 相似文献
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《新型炭材料》2014,(6):460
New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope 相似文献
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《中国标准化(英文版)》2014,(5):3-3
正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection. 相似文献