团球状巫晶体奥氏体——贝氏体钢抗冲击磨料磨损行为

采用ＴＥＭ,ＳＥＭ,电子探针和ＭＤＬ－１０型动载磨料磨损实验机研究Ｍｇ－Ｃｅ－Ａｌ复合变质团球状共晶体奥－贝钢（简称ＡＢＮＥ钢）复相组织的形成及抗冲击磨料磨损行为。结果表明,钢中贝工体组织由板条铁素体与残余奥氏体组成,团球状共晶体是（Ｆｅ,Ｍｎ）３Ｃ和奥氏体两相伪共晶组织。ＡＢＮＥ钢在中、低冲击工况下耐磨性优于奥－贝钢、奥－贝球铁、团球状碳化物中锰钢,其原因与团球状共晶体可有效地减轻磨料的侵入深度     

耐磨锰钢中共晶体的球化

对Ｃａ变质处理的奥氏体－贝氏体耐磨锰钢进行了热力学二维点阵错配度计算，采用ＴＥＭ和ＳＥＭ观察及电子探针分析，发现ＣａＳ可以作为共晶体（奥氏体－渗碳体）的异质核心而使共晶体球化．     

E.C.Bain在X射线金相学方面的重要贡献

Ｅ．Ｃ．Ｂａｉｒ在１９２１－１９２７年间将Ｘ射线粉晶法引入金相学研究，首先发现ＡｕＣｕ３及Ａｕ３Ｃｕ超点阵结构、Ｆｅ－Ｍｎ的奥氏体面心立方结构、高速钢中的Ｆｅ３Ｗ３Ｃ（Ｍ６Ｃ）碳化物以及铬镍不锈钢中的Ｓｉｇｍａ相。他还对奥氏体的转变进行了深入的研究，提出奥氏体／马氏体相变的晶体学关系（Ｂａｉｎ关系），发展出用Ｘ射线测定残留奥氏体的方法，终于在１９３０年开创奥氏体恒温转变的研究，在中温转变得出的以他     

ESTABLISHMENT AND APPLICATIONS OF MATHEMATICAL MODELS FOR CONCENTRATION DISTRIBUTIONS IN Mo－Fe－Ni－Co DIFFUSION QUARTERNARY （Ⅰ） Establishment of Mathematical Models

ＥＳＴＡＢＬＩＳＨＭＥＮＴＡＮＤＡＰＰＬＩＣＡＴＩＯＮＳＯＦＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＳＦＯＲＣＯＮＣＥＮＴＲＡＴＩＯＮＤＩＳＴＲＩＢＵＴＩＯＮＳＩＮＭｏ－Ｆｅ－Ｎｉ－ＣｏＤＩＦＦＵＳＩＯＮＱＵＡＲＴＥＲＮＡＲＹ（Ⅰ）Ｅｓｔａｂｌｉｓｈｍｅｎ...     

MAGNETIC PROPERTIES AND CRYSTALLIZATION BEHAVIOR OF AN AMORPHOUS（Fe＿（1－x）Mo＿x）＿（79）Si＿9B＿（13）ALLOY

ＭＡＧＮＥＴＩＣＰＲＯＰＥＲＴＩＥＳＡＮＤＣＲＹＳＴＡＬＬＩＺＡＴＩＯＮＢＥＨＡＶＩＯＲＯＦＡＮＡＭＯＲＰＨＯＵＳ（Ｆｅ＿（１－ｘ）Ｍｏ＿ｘ）＿（７９）Ｓｉ＿９Ｂ＿（１３）ＡＬＬＯＹＭＡＧＮＥＴＩＣＰＲＯＰＥＲＴＩＥＳＡＮＤＣＲＹＳＴＡＬＬＩＺＡＴＩ...     

ESTABLISHMENT AND APPLICATIONS OF MATHEMATICAL MODELS FOR CONCENTRATION DISTRIBUTION IN Mo－Fe－Ni－Co DIFFUSION QUARTERNARY──（Ⅱ） Characteristics and Applications of Mathematical Models

ＥＳＴＡＢＬＩＳＨＭＥＮＴＡＮＤＡＰＰＬＩＣＡＴＩＯＮＳＯＦＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＳＦＯＲＣＯＮＣＥＮＴＲＡＴＩＯＮＤＩＳＴＲＩＢＵＴＩＯＮＩＮＭｏ－Ｆｅ－Ｎｉ－ＣｏＤＩＦＦＵＳＩＯＮＱＵＡＲＴＥＲＮＡＲＹ──（Ⅱ）Ｃｈａｒａｃｔｅｒｉｓ...     

ON DISCONTINUOUS REINFORCED NiAl-BASED COMPOSITES

ＯＮＤＩＳＣＯＮＴＩＮＵＯＵＳＲＥＩＮＦＯＲＣＥＤＮｉＡｌ－ＢＡＳＥＤＣＯＭＰＯＳＩＴＥＳＣＨＥＮＧＴｉａｎｙｉ（ＭｅｔａｌＭａｔｅｒｉａｌｓＳｅｃｔｉｏｎ，ＢｅｉｊｉｎｇＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ，Ｐ．Ｏ．Ｂｏｘ３２７，Ｃｈｉｎａ，...     

奥氏体型Fe—Cr—Mn（M,V）合金相稳定性研究

通过形变加工和长期时效热处理，研究了（Ｃ＋Ｎ）复合强化的Ｆｅ－１３Ｃｒ－１７Ｍｎ（Ｍ，Ｖ）奥氏体合金的稳定性和相平衡特点，结果表明：在５００℃以下合金奥氏体稳定，不发生γ→α转变。采用（Ｃ＋Ｎ）复合添加晶粒细化，可有效抑制ε马氏体形成和σ相析出。５００～７００℃长期时效后形变诱发大量碳化物析出，Ｍｓ点提高，加快形变诱发α马氏体分解和再结晶，促使γ→α转变和σ相析出，合金奥氏体变得不稳定。     

CARBIDE PRECIPITATION AND BAINITE TRANSFORMATION IN Fe-C-Si ALLOY

ＣＡＲＢＩＤＥＰＲＥＣＩＰＩＴＡＴＩＯＮＡＮＤＢＡＩＮＩＴＥＴＲＡＮＳＦＯＲＭＡＴＩＯＮＩＮＦｅ－Ｃ－ＳｉＡＬＬＯＹ￥Ｒ．Ｌ．Ｚｕｏ;Ｌ．ＦａｎｇａｎｄＰ．Ｄ．Ｄｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｌｌｕｒｇｙａｎｄＭａｔｅｒｉａｌｓＥｎｇｉｎｅ...     

EFFECT OF TRACE ELEMENTS P AND Mn ON THE MICROSTRUCTURE AND HYDROGEN EMBRITTLEMENT OF AN Fe－Ni－Co BASED SUPERALLOY

ＥＦＦＥＣＴＯＦＴＲＡＣＥＥＬＥＭＥＮＴＳＰＡＮＤＭｎＯＮＴＨＥＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＨＹＤＲＯＧＥＮＥＭＢＲＩＴＴＬＥＭＥＮＴＯＦＡＮＦｅ－Ｎｉ－ＣｏＢＡＳＥＤＳＵＰＥＲＡＬＬＯＹＷＡＮＧＡｎｃｈｕａｎ;ＹＡＮＧＫｅ;ＦＡＮＣｕｎｇａｎ...     

奥-贝球墨铸铁制焊管预弯机下预弯模具的可行性研究

采用球化+二次孕育以及等温淬火工艺制备了球化等级为2级的奥-贝球墨铸铁,比较了奥-贝球墨铸铁、珠光体球墨铸铁和Cr12Mo1V1冷作模具钢的力学性能和摩擦磨损特性。结果表明:奥-贝球墨铸铁具有良好的力学性能和优异的摩擦磨损性能,组织中的贝氏体在摩擦磨损中可以有效地传递应力和起到支撑作用,提高了其抗磨性;较高的硬度和弹性模量以及石墨进入磨损表面润滑,减小了摩擦因数。认为采用奥-贝球墨铸铁制备焊管预弯机的下预弯模具具有可行性。     

A STEEL MATRIX WEAR RESISTANT COMPOSITE REINFORCED BY IN-SITU GRANULAR EUTECTICS

1. 'IntroductionA pajrticle reinforced metal matrix composite has higher strength and wear resistancethan that of its matrix material because the particle phases can strongly resist abrasivewearll--']. However, this material has significallt disadvatages of complex manufactureprocess and high cost, so it is very limited in applications. In this research, a new in sitegranular eutectic reinforced phase can be obtained for the first time by modifying witha St-Ce-Ti compound in the steel melt to…     

铸造无碳化物贝氏体耐磨钢的研究与应用

介绍了无碳化物贝氏体耐磨铸钢的合金化设计,研究了铸造无碳化物贝氏体耐磨钢热处理的组织和性能.铸造无碳化物耐磨钢正火低温回火热处理组织由贝氏体铁素体和奥氏体组成,属于非典型贝氏体或无碳化物贝氏体或奥氏体-贝氏体复相组织,淬火低温回火热处理组织由马氏体和残余奥氏体组成,属于马氏体-奥氏体复相组织.结果表明:铸造无碳化物贝氏体耐磨钢正火或淬火后低温回火,材料具有高的强度、高的韧性和高的耐磨性,低碳铸造无碳化物贝氏体耐磨钢具有良好的焊接性能.并介绍了铸造无碳化物贝氏体耐磨钢在矿山机械方面的应用.     

马贝球铁磨球动载磨料磨损试验研究

在非等温处理条件下获得的贝氏体及马贝体球铁磨球，对其解剖检测组织与性能．在ＭＬＤ－１０型试验机上进行动载磨料磨损试验，并在Ｄ＝１．８３ｍ水泥熟料磨机上实机装机验证考核．结果表明，在高冲击功的三体磨损条件下，材料的抗磨性能与韧性相关，硬度低的贝氏体不仅有好的冲击韧性，而且有与马氏体相当的抗磨性，在抗剥落磨损方面贝氏体是最佳的．马贝球铁磨球在水泥磨料中具有优异的综合效益     

高频感应熔覆铁基合金涂层组织及性能研究

采用高频感应加热熔覆方法在低碳钢基体上制备了铁基合金涂层;利用扫描电子显微镜、能谱仪及X射线衍射仪观察分析了涂层合金的显微组织结构,并对涂层合金进行耐磨性测试.结果表明:涂层合金与基体之间为冶金结合.组织为致密的放射状组织上分布着大量块状、条状的共晶体.放射状组织为马氏体相和γ合金固溶体相的混合组织上均匀覆盖着的大最的花状和枝品状共晶体.涂层具有较高的硬度和较好的耐磨性.     

Plastic deformation wear in modified medium manganese steel

A medium manganese steel with high wear-resistance, strength and toughness has been produced with addition of a complex modifier (or refining agent) containing Nb, N, RE and Si-Ca. The results showed that the wear resistance, strength and toughness of the modified medium manganese steel are respectively 1.92 times, 1.45times and 3.63 times as high as that of the referenced unmodified medium manganese steel. The plastic deformation characteristic involved in the wear mechanism of the modified medium manganese steel was investigated by means of plastic-elasticity calculation and TEM electro-microscopy. The relationship between wear resistance and yield strength of the steel was established. Since the wear volume W is proportional to the square of the loading and to the numbers of the abrasives, and inversely proportional to the square of the yield strength of the materials, the wear resistance can be substantially improved by the enhancement of yield strength of the materials. The calculation results generally agreed with the experimental results.     

Effect of Friction-Induced Deformation on the Structure,Microhardness, and Wear Resistance of Austenitic Chromium—Nickel Stainless Steel Subjected to Subsequent Oxidation

The effect of plastic deformation that occurs in the zone of the sliding friction contact on structural transformations in the 12Kh18N9T austenitic steel subjected to subsequent 1-h oxidation in air at temperatures of 300–800°C, as well as on its wear resistance, has been studied. It has been shown that severe deformation induced by dry sliding friction produces the two-phase nanocrystalline γ + α structure in the surface layer of the steel ~10 μm thick. This structure has the microhardness of 5.2 GPa. Subsequent oxidation of steel at temperatures of 300–500°C leads to an additional increase in the microhardness of its deformed surface layer to the value of 7.0 GPa. This is due to the active saturation of the austenite and the strain-assisted martensite (α′) with the oxygen atoms, which diffuse deep into the metal over the boundaries of the γ and α′ nanocrystals with an increased rate. The concentration of oxygen in the surface layer of the steel and in wear products reaches 8 wt %. The atoms of the dissolved oxygen efficiently pin dislocations in the γ and α′ phases, which enhances the strength and wear resistance of the surface of the 12Kh18N9T steel. The oxidation of steel at temperatures of 550–800°C under a light normal load (98 N) results in the formation of a large number of Fe₃O₄ (magnetite) nanoparticles, which increase the resistance of the steel to thermal softening and its wear resistance during dry sliding friction in a pair with 40Kh13 steel. Under a heavy normal load (196 N), the toughness of 12Kh18N9T steel and, therefore, the wear resistance of its surface layer decrease due to the presence of the brittle oxide phase.     

非合金化管坯冲孔模使用寿命的研究

研究用非合金化奥氏体-贝氏体球铁取代铁素体-珠光体稀土镁钼球铁,提高管坯冲孔模使用寿命的可行性。研究结果表明:球化处理+二次孕育处理的冶炼工艺提高了管坯冲孔模的铸态性能;900℃奥氏体化3h、400℃等温处理3h及水+油的双液快冷的热处理工艺,在管坯冲孔模的工作层中得到了奥氏体-贝氏体组织。经冶炼、热处理后的奥氏体-贝氏体球铁冲孔模的力学性能得到提高,使用寿命延长。     

连续冷却淬火球墨铸铁的性能研究

研究了连续冷却淬火球墨铸铁的组织与性能。结果表明:采用适当的化学成分,选择合适的淬火介质,可用连续冷却淬火获得奥贝组织的球铁,其硬度达54HRC,冲击韧度为21 J·cm(-2),相对耐磨性为淬火马氏体低合金钢的2.17倍。     

直缝焊管轧机轧辊球铁材质研究

研究了轧辊新材质———铜钒钛球铁。对石墨球化、铸态基体组织、力学性能、淬硬性、淬透性和滚、滑动摩擦磨损特性的系统研究表明，合金铜钒钛球铁是一种价格低廉、淬透性、耐磨性比ＧＣｒ１５钢更好的轧辊材质，更适合替代ＧＣｒ１５钢材质制造中、小截面轧辊