模具钢在硼砂：氯化钡混合熔盐中渗铬的研究

研究了在盐浴渗铬工艺中不同Ｃｒ２Ｏ３与Ａｌ的比例以及硼砂和各种氯化盐作为基盐，对Ｔ１０钢渗铬效果的影响。探讨了硼砂加氯化钡的最佳基盐成分和渗铬最佳工艺参数。分析了模具钢渗铬层的组织结构；测定了渗层厚度和表面硬度；考核了３Ｃｒ２Ｗ８Ｖ钢渗铬层的耐磨性和ＣｒＷＭｎ渗铬层的抗高温氧化性。     

Q235钢热浸渗铝层的组织分析和性能

分析了Q235钢热浸渗铝层的组织,并对其抗高温氧化和耐高温腐蚀性能进行了研究,显微硬度试验结果表明渗层硬度可达1000HV,并具有较大的脆性,经扩散退火后,渗层组织和显微硬度都发生了明显的变化。高温氧化和热腐蚀试验结果表明,渗铝Q235钢的抗高温氧化性能和1Cr18Ni9Ti奥氏体不锈钢相当,而耐热腐蚀性能明显优于后者。     

35碳钢Cr-Ti共渗及Al-Ti共渗层的高温氧化行为

用循环氧化法测定了35钢Cr Ti及Al Ti共渗层的抗高温氧化性能.Cr Ti共渗层内侧富集的Ti以稳定的TiC形式存在,阻碍了表层富集的Cr向内层扩散,在700、800℃×96h条件下的抗高温氧化性能与0Cr18Ni9不锈钢接近.Al Ti共渗层内侧富Al,外侧富Ti.但经24h氧化加热后,Al、Ti元素的分布发生逆转,Al向表面富集,而Ti在渗层内侧富集并形成TiC,使氧化增重速率明显下降.如果以24h氧化加热后的氧化增重速率为比较标准,Al Ti共渗层在900℃×96h的抗高温氧化性能优于Cr Ti共渗.     

稀土元素在渗铝覆层中的作用

通过对20Cr、40Cr钢及Fe-Cr-Al合金进行渗铝和稀土-铝共渗的对比研究，发现稀土元素的加入有如下作用：①可以起到催渗的作用；②可以提高覆层的抗高温氧化性能；③可提高Fe-Cr-Al合金的韧性。应用x射线衍射技术，对稀土元素提高覆层抗高温氧化性能的机理进行了分析。     

钒硼共渗层组织结构的研究

本文研究了钢T12,45在硼砂熔浴中经硼钒,硼铬共渗处理后共渗层的组织和形态。结果表明:T12钢在950℃以上硼钒共渗层主要由V_3B_2和Vc组成,处理温度低于950℃共渗层是由(Fev),B组成。随着溶剂中钒含量的增加共渗层减薄,共渗层从梳齿状变为平坦光滑连续的渗层。共渗层的硬度为Hv_(100)1650-2250,渗层具有比渗硼层高的抗蚀性、热硬性和良好的韧性。因此,硼钒、硼铬共渗将是值得研究的有前途的钢表面强化新方法。     

45^#碳钢渗硼工艺及性能的研究

研究了４５＾＃碳钢固相渗硼工艺和配方，用金相显微镜，显微硬度计算研究渗硼组织结构。结果表明：４５＾＃钢渗硼层具有高硬度，高耐磨 ，优良的耐腐蚀性和抗高温氧化性能。通过入调整工艺发迹渗硼层厚度可满足工件不同使用性能的要求。     

高碳钢V—Re共渗及其组织性能的研究

本文试验了T8、GCr15钢的盐浴V-Re共渗,并对共渗工艺性、渗层组织、渗后热处理和渗层耐蚀性以及它们之间的相互影响进行了试验分析.结果表明:添加了少量Re的V-Re共渗盐浴流动性提高、渗速加快,得到的渗层由以VC为主的化合物层及过渡层组成,化合物层硬度可达HV_(m,0.05)2500,厚度可达25μm,具有良好的耐蚀性和热处理性能;渗后进行淬火、回火可强化基体,而对渗层性能、渗层与基体间结合无显著影响.     

钢表面ZrO2陶瓷纳米等离子喷涂

采用等离子喷涂技术在20Cr钢表面等离子喷涂纳米ZrO2涂层,并用1Cr18Ni9作中间梯度涂层,用以制造特殊管状绝热体.利用SEM方法研究了梯度涂层的结构和显微组织,通过摩擦磨损试验对涂层的耐磨性能进行了分析,用热震法研究了涂层和基体的结合力,并用有无热障涂层的箱体进行实际模拟对比试验,测试了涂层的隔热性能.研究结果表明,ZrO2纳米陶瓷层和1Cr18Ni9梯度层可以形成良好的机械结合;喷涂后的试样表面显微硬度显著提高,耐磨性比GCr15轴承钢提高2.84倍;纳米陶瓷梯度涂层使20Cr钢的隔热性能和抗高温氧化性能显著提高.     

奥氏体不锈钢离子渗氮层相结构与性能研究

对1Cr18Ni9Ti奥氏体不锈钢进行离子渗氮处理,研究不同渗氮条件下渗氮层的相结构与性能。结果表明:1Cr18Ni9Ti不锈钢离子渗氮时,钢中Cr与氮反应仅形成CrN,而非Cr2N;伴随CrN的形成,渗层原奥氏体转变为马氏体。经V(N2)∶V(H2)为1∶9及1∶3气氛氮化,渗氮层韧性很高;当气氛V(N2)∶V(H2)达3∶1时,形成大量γ′、ε相,渗层韧性剧减;气氛V(N2)∶V(H2)为1∶3时,耐磨性最佳。     

奥氏体不锈钢离子渗氮层相结构与性能研究

对1Cr18Ni9Ti奥氏体不锈钢进行离子渗氮处理，研究不同渗氮条件下渗氮层的相结构与性能。结果表明：1Cr18Ni9Ti不锈钢离子渗氮时，钢中Cr与氮反应仅形成CrN，而非Cr2N；伴随CrN的形成，渗层原奥氏体转变为马氏体。经V(N2)：V(H2)为1：9及1：3气氛氮化，渗氮层韧性很高；当气氛V(N2)：V(H2)达3：1时，形成大量γ’、ε桐，渗层韧性剧减；气氛V(N2)：V(H2)为1：3时，耐磨性最佳。     

Preparation and property of chromium carbide thermal diffusion coating on cold working die materials

Thermal diffusion (TD) salt bath chromizing of cold working dies was studied. Firstly, it obtained an ideal salt bath formula by comparing with a variety of formulas, and then obtained the influence rule of coating thickness based on studying of some process parameters. The microstructure morphologies and phase structures of the TD chromizing coating were investigated by X-ray diffraction (XRD), energy-dispersive spectrometry (EDS) and other modern analysis methods. Meanwhile, it carried out a system of testing and analysis of coating, such as hardness, wear resistance, etc.     

渗铬P110钢在CO2饱和模拟油田采出液中的耐蚀性

为了提高P110油套管钢的表面性能,以满足其在油田环境下服役的要求,采用包埋法对P110钢进行渗铬处理.借助扫描电镜、能谱仪和x射线衍射仪,对渗铬层的表面形貌、显微组织、成分分布和相结构进行了分析和表征,利用电化学测试技术测定P110钢及其渗铬层在CO₂饱和模拟油田采出液中的开路电位、极化曲线和交流阻抗谱.结果表明：渗铬层由Cr₂₃C₆、Cr₇C₃和（Cr,Fe）₇ C₃等相构成,且均匀、连续,与P110钢相比,具有更高的开路电位和电荷转移电阻及更低的电流密度和腐蚀速率.渗铬处理显著提高了P110钢的耐蚀性.     

Coordinately Improving the Wear and Fatigue Properties of Ti6Al4V Alloy by Designed CrZr-alloyed Layer

A CrZr-alloyed layer was prepared through a pre-zirconizing and subsequent chromizing treatment on a Ti6Al4V substrate.After the removal of the top Cr deposit and Ti_4Cr layers,a(Cr,Zr)-Ti solidsolution layer was obtained.The microstructure,composition,microhardness and toughness of the(Cr,Zr)-Ti solid-solution layer were evaluated.The results showed that the pre-addition of Zr played an important role in inhibiting the precipitation of the soft Ti_4Cr phase,which in turn allowed us to obtain a material characterized by a remarkable hardness.Wear and fatigue tests showed that the(Cr,Zr)-Ti solid-solution layer could coordinately improve the properties of the Ti6Al4V alloy.This was mainly due to the good match of hardness and toughness of the(Cr,Zr)-Ti solid-solution layer.In addition,the gradual change in composition and mechanical properties was conducive to the coordinated deformation between the(Cr,Zr)-Ti solid-solution layer and the Ti6Al4V substrate during fatigue tests.This reduced the stress concentration in correspondence of the interface between the two materials.     

低碳钢和不锈钢粉末渗铝研究进展

文章介绍了低碳钢、不锈钢粉末渗铝的特点和原理。钢经过渗铝后,表面硬度增加,渗铝层的耐磨性、抗高温氧化性能、耐蚀性均得到提高,在石油、化工、电力等行业具有广泛的应用前景。     

High temperature behaviors of high velocity arc sprayed Fe-Al/Cr3C2 composite coatings

Fe-Al/Cr3C2 composite coatings were manufactured using high velocity arc spraying （HVAS） technology. The high temperature erosion, wear and corrosion resistance of the coatings were investigated. The coating properties such as bonding strength, porosity, hardness as well as microstructures were characterized. The results show that the coatings have relatively high heat tremble bond strength, hardness, and typical layer-shaped coatings＇ microstructures. With the rise of temperature, the coating erosion resistance increases too; the impingement angel does effects on erosion properties, and the erosion mechanism changes from ductile to brittle behaviors at 450℃. The coatings have good room temperature wear resistance and relatively good high temperature resistance. The wear mechanism of the coatings is peeling wear behavior. The coatings have excellent high temperature corrosion resistance because of the produce of oxides during corrosion.     

大功率内燃机车气缸套的无污染盐浴软氮化处理工艺

用无污染盐浴软氮化工艺处理大功率内燃机车气缸套，其渗层均匀、缸径变形极小，缸套的耐磨、耐蚀、耐疲劳性能良好．经工艺试验和生产性试验证明，该工艺简单、性能可靠，所处理的缸套可替代美国G．E．公司生产的同种缸套使用．     

Microstructure and corrosion properties of laser cladding MoNi based alloy coatings

Mo-based alloys are widely used for their excellent wear and corrosion resistance as well as high temperature resistance.Mo-NiCrBSi and Mo-Ni alloy coatings were prepared on 1020 water wall tube by laser cladding technology in the present study.The microstructure and phase compositions were analyzed by means of the scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS)and X-ray diffractometry(XRD).The corrosion properties of the coatings were evaluated by an electrochemical experiment at room temperature in 3.5 wt.%NaCl electrolyte.With increasing content of Mo,the structure homogeneity in Mo-Ni coatings deteriorated,the grain size increased,the average hardness and the corrosion resistance declined,due to the more content of harmful phases.Compared to the Mo-Ni coatings,the overall performance was better for the Mo-NiCrBSi,which had the higher hardness contributed by the element B and Si as well as the better corrosion resistance due to the addition of Cr.     

M2高速钢强脉冲离子束表面改性及其耐磨耐蚀性

针对陶瓷梯度涂层性能优良,在大气氛围下等离子喷涂制备涂层会受到空气氧化这一情况,在可控气氛（Ar气）中采用等离子喷涂的方法制取了NiCrBSi/Al₂O₃的梯度涂层,并且与大气条件下制取的NiCrBSi/Al₂O₃的梯度涂层进行对比.借助扫描电子显微镜（SEM）、x 射线衍射仪（XRD）对涂层的组织分布、相结构进行分析.结果表明：在Ar气和大气中梯度涂层的组织内部都没有明显的界面,实现了组织的连续变化;在Ar气中制取的梯度涂层的组织更加致密,被氧化的程度更低,质量更好.     

单晶硅表层机械力学特性的各向异性分析

为探究挠性筋结构单晶硅材料的各向异性特性以及KOH腐蚀工艺对其力学性能的影响规律,进行纳米压痕实验,并结合原子力显微镜观察单晶硅表层3个主晶面上压痕裂纹形貌随晶向的变化规律,分析单晶硅材料表层弹性模量、硬度、断裂韧性等机械力学特性参数在(001)、(110)及(111)3个主要晶面上沿各个晶向的变化规律;分析挠性筋结构单晶硅材料(001)晶面的KOH腐蚀工艺对其材料表面机械特性的影响规律.结果表明:挠性筋单晶硅在(001)晶面上弹性模量的各向异性变化幅度明显,硬度及断裂韧性各向异性的变化幅度不大;挠性筋单晶硅在(110)晶面弹性模量和断裂韧性的各向异性变化幅度明显,硬度各向异性变化幅度不大;挠性筋单晶硅在(111)晶面硬度值、弹性模量及断裂韧性参数的变化幅度幅值均较小;确定了单晶硅表层3个晶面裂纹最易扩展的晶向方向,KOH腐蚀工艺使得单晶硅表面质量降低,腐蚀后暴露的表面微裂纹、缺陷等会使得单晶硅(001)晶面表层硬度、断裂韧性降低,从而降低了挠性筋结构的实际断裂强度.