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| 1 | 烧结后热处理对烧结硬化粉末冶金钢零件尺寸精度与力学性能的影响显示文摘在铁基粉末冶金零件的最终形生产中尺寸精度是一个关键参数。粉末冶金零件生产厂商一直在追求较大的零件,但终端用户规定的绝对公差一般并不随零件尺寸而改变。因此,对较大的零件,尺寸变化或尺寸变化的偏差必须减小。除了与常用低合金粉末冶金钢的压制与烧结相关的尺寸变化外,烧结硬化合金对粉末冶金零件生产还提出了一些独特挑战与机遇。在烧结炉中能淬硬的零件,就不要后续淬火作业了。可是,形成的未回火的马氏体显微结构对尺寸稳定性与力学性能来说并不理想。回火的淬硬钢由于马氏体转变成了密度较高的较稳定的铁素体与碳化物显微结构,从而改善了力学性能并使尺寸产生收缩。另外,许多铜及碳含量高的烧结硬化钢牌号都会导致残留奥氏体的含量较高。残留奥氏体可改进冲击性能与延展性,但是,由于热波动残余奥氏体可转变成密度较低的贝氏体和/或马氏体从而影响尺寸的稳定性。为得到最好的力学性能与尺寸控制组合,烧结硬化钢需要进行适当的热处理。本文考察不同的烧结后热处理对烧结硬化粉末冶金钢尺寸、显微结构以及力学性能的影响。 | Bruce Lindsley Thomas Murphy 亓家钟(译) 韩风麟(校) | 2011 | 粉末冶金工业2011,21,1: | 5 |
| 2 | 烧结-硬化钢的尺寸精度显示文摘尺寸精度是铁基粉末冶金零件生产工艺的关键参数。除了和标准粉末冶金低合金钢的压制与烧结相关的尺寸变化外,烧结-硬化合金还会产生从奥氏体转变为马氏体的相变。马氏体是钢中密度最低的相,因此,冷却时马氏体的形成会导致零件显著胀大。当马氏体转变为密度较高的铁素体与碳化物显微组织时,回火的淬硬钢发生收缩。这两种相变对零件的尺寸变化都有很大影响。另外,在Cu与C含量高的马氏体区可能有大量残余奥氏体存在。奥氏体相密度最高,所以残余奥氏体会导致压坯胀大较小。除回火处理外,马氏体与残余奥氏体的存在都会影响零件的最终尺寸。本文考察了两个烧结-硬化钢牌号,同时通过不同的后烧结热处理,研究了这两个牌号钢的尺寸变化和显微组织变化。 | Bruce Lindsley Thomas Murphy | 2009 | 粉末冶金技术2009,27,6: | 2 |
| 3 | 制造烧结金属含油轴承的高性能青铜粉显示文摘自润滑青铜轴承的性能决定于许多因素的综合作用,诸如精整后的密度、径向压溃强度(RCS)、含油量、表面粗糙度、施加的载荷、轴的速度及孔隙结构。压坯与烧结体的密度以及烧结时的尺寸变化(DC),在轴承制造中都很重要。这篇文章阐述了生产高使用性能烧结轴承用的一系列新的青铜粉末。对使用性能的测定表明,与用标准的预混合青铜粉末制造的轴承相比,这些轴承摩擦系数较小,温升较低且稳定,而且径向压溃强度较高。性能优异是因为连通孔隙结构较细小,从而通过极好的毛细作用可吸入大量油。在理论上,较高的RCS可使轴承具有较高的承受载荷的能力。 | Nic Veloff Anil Nadkarni Thomas Murphy 韩凤麟(译) | 2007 | 粉末冶金技术2007,25,5: | 2 |
| 4 | 铁基粉末冶金材料烧结程度的判定显示文摘烧结过程可改进压制-烧结的铁基材料的物理-力学性能。烧结时因扩散产生颗粒结合与合金化;随着烧结时间增长,强化材料性能。烧结的作用通过显微组织特征(诸如颗粒边界与孔隙边缘)的变化可以看出。烧结的一些改进表现为颗粒边界消失,孔隙边缘变得较平滑和颗粒间尖角特征数量减少。一般将这些特征与特性的外观和它们发生的频率一起当做是烧结程度。用众所周知的体视技术(Stereological practies)与适当制备的金相试样,可以判定烧结程度。关于判定与区分烧结程度不同的材料,将讨论3种试验方法。另外,将用烧结时间不同的铁-铜-碳预混合粉材料的图像来说明这些显微组织的变化。 | Thomas F. Murphy 韩凤麟(译) | 2010 | 粉末冶金技术2010,28,2: | 2 |
| 5 | Resistant Hypertension: Diagnosis, Evaluation, and Treatment: A Scientific Statement From the American Heart Association Professional Education Committee of the Council for High Blood Pressure Research显示文摘 | David A. Calhoun Daniel Jones Stephen Textor David C. Goff Timothy P. Murphy Robert D. Toto Anthony White William C. Cushman William White Domenic Sica Keith Ferdinand Thomas D. Giles Bonita Falkner Robert M. Carey | 2008 | Hypertension2008,,6: | 1 |
| 6 | Resistant Hypertension: Diagnosis, Evaluation, and Treatment: A Scientific Statement From the American Heart Association Professional Education Committee of the Council for High Blood Pressure Research显示文摘 | David A. Calhoun Daniel Jones Stephen Textor David C. Goff Timothy P. Murphy Robert D. Toto Anthony White William C. Cushman William White Domenic Sica Keith Ferdinand Thomas D. Giles Bonita Falkner Robert M. Carey | 2008 | Hypertension2008,,6: | 1 |
| 7 | Metallography of powder metallurgy materials显示文摘 | Alan Lawley Thomas F. Murphy | 2004 | Materials Characterization2004,,5: | 1 |
| 8 | Mitochondria‐targeted antioxidant (MitoQ) ameliorates age‐related arterial endothelial dysfunction in mice显示文摘 | Rachel A. Gioscia‐Ryan Thomas J. LaRocca Amy L. Sindler Melanie C. Zigler Michael P. Murphy Douglas R. Seals | 2014 | J Physiol2014,,12: | 1 |
| 9 | Growing Epidemic of Coronary Heart Disease in Low- and Middle-Income Countries显示文摘 | Thomas A. Gaziano Asaf Bitton Shuchi Anand Shafika Abrahams-Gessel Adrianna Murphy | 2010 | Current Problems in Cardiology2010,,: | 1 |
| 10 | Metallography of powder metallurgy materials显示文摘 | MURPHY A THOMAS F | 2003 | Materials Characterization2003,51,5: | 1 |
| 11 | Use of leukocyte poor blood components and HLA match platelet donors to prevent HLA alloimmunization显示文摘 | MURPHY M F METCALFE p THOMAS H | 1986 | Br J Hematol1986,62,3: | 1 |
| 12 | A meta-analysis of hypothetical bias in stated preference valuation 显示文摘 | Murphy James Allen P Thomas Stevens | 2005 | Environmental and Resource Economics2005,30,: | 1 |
| 13 | Telangiectatic osteosarcoma:radiologic-pathologic comparison显示文摘 | Murphy MD Wan-Jaovisidha S Thomas Temple H | | 0,,02: | 1 |
| 14 | An antibody to the beta-secretase cleavage site on amyloid-beta-protein precursor inhibits amyloid-beta production显示文摘 | Thomas R S Liddell J E Murphy L S | 2006 | J Alzheimers Dis2006,10,4: | 1 |
| 15 | Polarization and far-field diffraction patterns of total internal reflection comer cubes 显示文摘 | Thomas W Murphy Jr Scott D Goodrow | 2013 | Applied Optics(S0003-6935)2013,52,: | 1 |
| 16 | Similar expression to FGF (Sef) inhibits fibroblast growth factor-induced tumourigenic behaviour in prostate cancer cells and is downregulated in aggressive clinical disease显示文摘 | DARBY S MURPHY T THOMAS H | 2009 | Br J Cancer2009,101,11: | 1 |
| 17 | Regulatory Effects of iNOS on Acute Lung Inflammatory Responses in Mice显示文摘 | Cecilia L. Speyer Thomas A. Neff Roscoe L. Warner Ren-Feng Guo J. Vidya Sarma Niels C. Riedemann Megan E. Murphy Hedwig S. Murphy Peter A. Ward | 2003 | The American Journal of Pathology2003,,: | 1 |
| 18 | Retrofitting suspension bridges using distributed dampers 显示文摘 | Murphy Thomas P Collins Kevin R | 2004 | Journal of Structural Engineering2004,130,10: | 1 |
| 19 | Percutaneous Vertebral Augmentation: The Status of Vertebroplasty and Current Controversies显示文摘 | Rikin Hargunani Thomas Le Corroller Khalid Khashoggi Kieran Murphy Peter Munk | 2011 | Semin Musculoskelet Radiol2011,,02: | 1 |
| 20 | Logistics outsourcing relationships:Customer perspectives显示文摘 | A Michael Knemeyer Thomas M Corsi and Paul R Murphy | 2003 | Journal of Business Logistics2003,24,1: | 1 |