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heat treating OF SINTERED Fe-1.5Mo-0.7C STEELS AND THEIR SLIDING WEAR BEHAVIOR

Acta Metallurgica Sinica(English Letters) 2003年第1期16卷 51-59页

作者： J.A.Wang Y.He et al State Key Laboratory of Mechanical Transmission Chongqing University Chongqing400044China School of Materials Science and Engineering Shanghai UniversityShanghai200072China

The influence of heat treating on mechanical properties as well as on the sliding wear behavior of sintered Fe-1.5Mo-0.7C steels was experimentally studied. The microstruc-tures of sintered steels change from upper bainite to martensite, tempered martensite, pearlite and lower bainite depending on the heat treating conditions. heat treating increases the hardness of sintered steels but high tempering temperature, i.e. 700℃, causes the hardness to be even lower than that of the as-sintered ones. The impact energy of sintered steels increases with increasing tempering temperature and arrives the highest at 700℃, while the steels tempered at 200℃ have the highest transverse rupture strength. Austempering results in fair good overall properties, such as hardness, impact energy, and transverse rupture strength. When the sintered steels were austempered, oil-quenched or tempered below 400? after quenched, the wear coefficient becomes considerably lower. Fair high hardness, such as HV30 > 380, and structures of martensite, tempered martensite or lower bainite are beneficial to lowering the wear coefficient. Under the wear test conditions given, delamination and oxidational wear are the main wear regimes for sintered Fe-1.5Mo-0.7C steels. Fe3O4 in the wear debris is beneficial to lowering wear coefficient.

关键词： heat treating sintered Fe-1.5Mo-0.7C steel sliding wear

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Effect of Prior Austenite Grain Size on the Morphology and Mechanical Properties of Martensite in Medium Carbon Steel

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Journal of Materials Science & Technology 2012年第5期28卷 461-466页

作者： Y.Prawoto N.Jasmawati K.Sumeru Faculty of Mechanical Engineering Universiti Teknologi Malaysia81310 UTMSkudaiJohor 81310Malaysia Dept.of Refrigeration and Air Conditioning Engineering Politeknik Negeri BandungIndonesia

In industrial application,unintentional manufacturing line troubles often consequence in heating raw materials excessively,in terms of either time or *** of the effects of such occurrence is a product with a variation of prior austenite grain size,even if after the heat treatment the end result is the same,*** variation of the prior austenite grain size is believed to vary the end results of the *** undesirable variation includes the variation of fatigue resistance,impact strength,yield strength,hardness,*** research studies the effect of the prior austenite grain size on the morphology of the martensite *** results show that within the typical industrial application of temperature and holding time set up,as holding time or the temperature increases,the prior austenite average diameter *** block and packet sizes in the martensite also *** variation of mechanical property dependence on the grain size is indeed due to the different characteristics reflected in the martensite *** respect to the same area,smaller grain has more blocks and packets,which agrees with higher dislocation density verified with transmission electron microscopic evaluation.

关键词： heat treating Mechanical testing Carbon/alloy steels

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Development of microalloyed steels for high temperature carburizing

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Baosteel Technical Research 2010年第S1期4卷 86-页

作者： David K MATLOCK John G SPEER Steven G JANSTO Marcos STUART Advanced Steel Processing and Products Research Center Colorado School of Mines GoldenColorado USA CBMM-Reference Metals Bridgeville PA CBMM Sao Paulo Brasil

The potential for use of microalloy additions to suppress abnormal austenite grain growth and produce steels with enhanced bending fatigue resistance after high temperature vacuum carburizing was investigated in a series of Ti-modified SAE 8620 steels with w(niobium) additions up to 0.1%.Results are considered from a series of papers at the Advanced Steel Processing and Products Research Center on the effects of Nb content,heating rate, rolling history,and processing temperature on the evolution of austenite grain structures in carburizing steels. Emphasis is placed on understanding the effects of alloying and processing on each stage in the annealing process including the as received laboratory rolled conditions,during the onset of carburizing after annealing at different heating rates,and after annealing for various times at carburizing temperatures up to 1 100℃.heating rate to the carburizing temperature was shown to be an influential variable and suppression of abnormal grain growth was dependent on the development of a critical distribution of fine NbC precipitates,stable at the austenitizing *** importance to industrial carburizing practice of heating rate effects on precipitates and austenite grain size evolution are discussed and correlated to selected data on fatigue performance.

关键词： heat treating microalloying carburizing niobium abnormal grain growth

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