10Cr4Ni4Mo4V钢和Cr4Mo4V钢的特性与断裂行为

对１０Ｃｒ４Ｎｉ４Ｍｏ４Ｖ钢和Ｃｒ４Ｍｏ４Ｖ钢的特性与断裂行为进行了试验研究。结果表明,１０Ｃｒ４Ｎｉ４Ｍｏ４Ｖ钢经微氮渗碳热处理后,其表面硬度、残余应力、断裂韧性及裂纹扩展速率均优于Ｃｒ４Ｍｏ４Ｖ钢的。     

汽轮机中压阀杆镀铬

介绍了３５ＣｒＭｏＡ调质镀铬，淬火后镀铬，２Ｃｒ１２ＮｉＭｏＷＶ、２５Ｃｒ２ＭｏＶ氮化后疲劳试验以及现场测试研究，发现了氮化和淬火后镀铬的试件使用寿命大大提高。     

16Co14Ni10Cr2MoA超高强度钢焊接接头组织和性能的研究

介绍了１６Ｃｏ１４Ｎｉ１０Ｃｒ２ＭｏＡ超高强度钢氩弧焊接头的力学性能，与４０ＣｒＭｎＳｉＭｏＶＡ超高强度钢的焊接接头作了对比分析，并借助金相和电镜对接头组织进行了分析。结果表明，该超高强钢的焊接性良好，不仅接头强度高，而且塑性和韧性仍保持很高水平。     

(WC-Co/NiCrBSi)钎焊涂层结合机制及磨损性能研究

采用真空钎焊工艺,将ＷＣ－Ｃｏ硬质合金粉和ＮｉＣｒＢＳｉ（ＡＷＳＢＮｉ－２）合金粉钎焊到４５＃钢表面,得到（ＷＣ－Ｃｏ／ＮｉＣｒＢＳｉ）钎焊涂层。不同钎焊工艺下,涂层及涂层／基体的拉伸强度分别达１００—１４０ＭＰａ和３００－３６０ＭＰａ。初步分析了钎焊涂层结合机制。涂层的磨料磨损性能远高于同配比的火焰堆焊涂层及Ｃｏ－Ｃｒ－Ｗ堆焊层     

电镀

９９０９００１　Ｃｒ镀层、Ｎｉ－Ｐ、Ｎｉ－Ｍｏ、Ｎｉ－Ｗ－Ｐ和Ｍｎ－Ｚｎ合金镀层性能比较——ＡｇｌａｄｚｅＴ．ＴｒａｎｓＩｎｓｔＭｅｔａｌＦｉｎ,１９９７,７５（１）∶３０（英文）研究了Ｃｒ镀层、Ｎｉ－Ｐ、Ｎｉ－Ｍｏ、Ｎｉ－Ｗ－Ｐ和Ｍｎ－Ｚｎ合金镀层性能与电流效率／电流密度比值、热处理前后（对Ｎｉ－Ｐ合金镀层而言）镀层应力和显微硬度的关系。研究了热处理和放电处理对高硬度Ｎｉ－Ｗ－Ｐ合金镀层的影响,用比色分析法分析了各种镀层。详细介绍了电沉积Ｍｎ－Ｚｎ合金［含２５％（ｗｔ）Ｚｎ］的槽液成分、极化曲…     

中法新材料的对比试验

中法新材料的对比试验为确保直九国产化研制新材料不低于８０年代法国标准先进水平，哈飞公司对新材料进行了系统的剖析。进行对比试验的有铝合金２６１８Ａ、７０７５板、２０２４、２２１４、２０１４，合金钢１５ＣｒＭｎＭｏＶＡ、３０Ｎｉ４ＣｒＭｏＡ、３５Ｎｉ４Ｃ...     

（WC—Co／NiCrBSi）钎焊涂层结合机制及磨损性能研究

采用真空钎焊工艺,将ＷＣ－Ｃｏ硬质合金粉和ＮｉＣｒＢＳｉ（ＡＷＳＢＮｉ－２）合金粉钎焊到４５＃钢表面,得到（ＷＣ－Ｃｏ／ＮｉＣｒＢＳｉ）钎焊涂层。     

Ni_3Al(IC-6)合金防护涂层抗氧化性能研究

Ｎｉ３Ａｌ合金是一种新型高温合金，ＩＣ－６合金是不含Ｃｒ而含１４％Ｍｏ的Ｎｉ３Ａｌ合金。由于高温下Ｍｏ极易氧化升华，因此为使ＩＣ－６合金在高温下可靠工作，需选择ＮｉＣｒＡｌＸ涂层作为ＩＣ－６合金的保护涂层。采用磁控溅射技术，在专用装置上按通过系统研究提出的工艺涂覆ＮｉＣｒＡｌＸ涂层，并对其抗周期氧化性能进行了研究。试验表明：ＮｉＣｒＡｌＹＳｉ涂层对ＩＣ－６合金的防护是非常有效的。     

Al对含P,Mo奥氏体不锈钢应力腐蚀性能的影响

用点焊接试验方法评价了合金元素Ａｌ对含Ｐ和Ｍｏ奥氏体不锈钢应力腐蚀破裂性能的影响。结果表明，单独添加Ａｌ没有改善应力腐蚀破裂性能，而复合添加Ａｌ和Ｃｕ有效地提高了抗应力腐蚀性能。１４Ｃｒ－１６Ｎｉ－２Ｃｕ－３Ａｌ钢中添加Ｍｏ，虽然降低应力腐蚀性能，但影响较小。含０．３％Ｍｏ时应力腐蚀破裂临界温度可达１２０℃。ＡＥＳ分析表明，Ａｌ和Ｃｕ元素在表面膜中富集。Ａｌ和ｃｕ的联合作用使钢表面膜的钝化能力得到加强，从而提高了抗应力腐蚀性能。     

Ni3Al（IC—6）合金防护涂层抗氧化性能研究

Ｎｉ３Ａｌ合金是一种新型高温合金，ＩＣ－６合金是不含Ｃｒ而含１４％Ｍｏ的Ｎｉ３Ａｌ合金。由于高温下Ｍｏ极易氧化升华，因此为使ＩＣ－６合金在高温下可靠工作，需选择ＮｉＣｒＡｌＸ涂层作为ＩＣ－６合金的保护涂层。     

Stainless steels suited for solution nitriding

Solution nitriding is a new heat treatment to yield a high nitrogen case on stainless steels at 1100 ± 50°C. Combining experimental results and thermodynamic calculation steels are selected to give a hard martensitic or high strength austenitic case. Especially developed steels are discussed as well as the suitability of standard grades. A martensitic case is combined with a martensitic core in steel Cr13C0.2 and with a softer ferritic‐martensitic core in steel Cr13C0.1. The nitrogen content of an austenitic case increases with the Cr/Ni ratio, e.g. in the order of Cr17Ni12Mo2, Cr18Ni10, Cr22Ni5Mo3N0.2. The duplex microstructure of the latter provides the highest yield strength in the core. It is essential to stay clear of the austenite/austenite + M₂N boundary and avoid precipitates which deteriorate the fatigue and corrosion resistance. Seventeen steels are assessed in this report.     

Mo元素对ZG04Cr13Ni4Mo不锈钢力学性能的影响

对12%Cr和13%Cr系列ZG04Cr13Ni4Mo不锈钢进行893 K一次回火和893 K+863 K二次回火处理,使用热膨胀仪、X射线衍射仪和室温单轴拉伸等手段研究了Mo含量对这两个系列不锈钢的相组成和力学性能的影响。结果表明,随着Mo和Cr含量的提高钢的奥氏体化开始点(A_s)温度逐渐降低。不同Mo含量的钢经过893 K两相区温区一次回火处理,在加热和保温过程中马氏体向逆变奥氏体的转变量,与回火冷却至室温得到的逆变奥氏体含量不同。这种不同,导致12%Cr系列ZG04Cr13Ni4Mo钢随着Mo含量从～0.3%提高到～0.6%其屈服强度略有降低而抗拉强度略有提高,而Cr含量提高到13%Cr随着Mo含量的提高ZG04Cr13Ni4Mo钢经893 K回火后其屈服强度和抗拉强度都小幅度提高。     

航空用高强高韧钢16Co14Ni10Cr2MoEI

研究了16Co14Ni10Cr2Mo钢的力学性能和工艺性能。16Co14Ni10Cr2Mo钢的良好综合性能优于现用一般超高强度钢,可广泛地用于航空受力结构件。     

Mechanistic approach for prediction of creep deformation,damage and rupture life of different Cr–Mo ferritic steels

Abstract

A mechanistic approach based on finite element analysis of continuum damage as proposed by Kachanov has been used to assess and compare creep deformation, damage and rupture behaviour of 2·25Cr–1Mo, 9Cr–1Mo and modified 9Cr–1Mo ferritic steels. Creep tests were carried out on the steels at 873 K over a stress range of 90–230 MPa. Modified 9Cr–1Mo steel was found to have highest creep deformation and rupture strength whereas 2·25Cr–1Mo steel showed the lowest among the three ferritic steels. Creep damage in the steels has been manifested as the microstructural degradation. 2·25Cr–1Mo steel was more prone to creep damage than 9Cr–steels. Finite element estimation of creep deformation and rupture lives were found to be in good agreement with the experimental results.     

Chemische Diffusion von Molybdän in hochlegierten austenitischen CrNiMo(N)-Stählen

Interdiffusion of Molybdenum in High-Alloy Austenitic CrNiMo(N)-Steels The Volume diffusion of Mo in austenitic CrNiMo(N)-steels was studied using the sandwich method. Accordingly the interdiffusion coefficients of Mo were found to be independent of its concentration for the given steel compositions with 12 to 19 wt.% Cr, 12 to 16wt.% Ni, 0 to 2 wt.% Mo and 0 to 0.27 wt.% N and within the temperature range from 1283 to 1523 K. The diffusivity of Mo is greater than that of Cr, Ni and Fe in such steels. The diffusion parameters of Mo are decreased by alloying addition of nearly 0.25 wt.% N in Steel; possibly as a result of lattice expansion or increasing vacancy concentration caused by N. Small variations in Cr and Ni initial contents of examined specimens showed negligible effect on the absolute values of interdiffusion coefficients of Mo.     

铸造双相不锈钢点腐蚀行为研究

采用化学浸泡腐蚀试验及微观组织和化学成分分析研究了5种铸造双相不锈钢在6%Fe Cl3溶液中的点腐蚀行为,并与316L奥氏体不锈钢进行了对比。结果表明,铸造双相不锈钢的抗点腐蚀性能均优于316L的,腐蚀速率和点腐蚀深度均小于316L奥氏体不锈钢的;双相不锈钢主要耐点蚀能力合金元素在奥氏体和铁素体相内分布不均匀,铬、钼更多地分配于铁素体相内,而镍、氮则更多地分配于奥氏体相内,铁素体相的耐点蚀指数PRE(Cr%+3.3Mo%+16N%)大于奥氏体相;双相不锈钢的耐点腐蚀性能与化学成分有关,随着PRE的增加,双相不锈钢的耐点腐蚀性能提高,铜元素在铁素体内析出的富铜相导致点蚀优先在铁素体内发生和发展。     

两种AC-HVAF喷涂WC涂层微观组织以及耐蚀性研究

利用AC-HAVF喷涂技术在0Cr13Ni5Mo不锈钢上制备了WC-10Co-4Cr,WC-12Co涂层,并利用XRD,SEM,电化学以及盐雾实验分析了涂层的微观组织以及耐蚀性.结果表明:两种涂层相组成与其粉末一致,未出现其他喷涂技术普遍存在的W2C以及W,AC-HAVF喷涂技术可以有效的抑制WC的分解;两种涂层都很致密且与基体结合良好,孔隙率低;电化学以及盐雾实验发现,WC-10Co-4Cr涂层的耐蚀性好于WC-12Co涂层,并较基体0Cr13Ni5Mo不锈钢有较大的提高,粘结相中Cr元素的加入以及孔隙率低是WC-10Co-4Cr涂层耐蚀性优异的重要原因.     

激光熔敷钴合金涂层的抗空蚀和冲刷磨损性能

采用激光熔敷方法在20SiMn低合金钢表面制成了Co合金涂层，以两种目前水轮机转用材20SiMn低合金钢和0Cr13Ni5Mo不锈钢作为对比材料，对涂层进行了空蚀，液固两相流冲刷磨损及空蚀和冲刷磨损联合作用实验，采用失重法并结合能谱分析，X射线衍射分析及显微硬度测量等手段研究了涂层的显微结构和在不同形式损伤下涂层的性能并分析了原因。结果表明：在20SiMn低合金钢表面激光熔敷形成的Co合金涂层有良好的抗空蚀性能，这与涂层在空蚀过程中发生的应力诱发马氏体相变密切相关。良好的抗空蚀性能有利于提高涂层抗空蚀和冲刷磨损联合破坏，从而使涂层表现出与0Cr13Ni5Mo不锈钢接近的抗联合损伤性能。     

Microstructure in the Weld Metal of Austenitic-Pearlitic Dissimilar Steels and Diffusion of Element in the Fusion Zone

Microstructure and alloy element distribution in the welded joint between austenitic stainless steel (1Cr18Ni9Ti) and pearlitic heat-resistant steel (1Cr5Mo) were researched by means of light microscopy, scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Microstructure, divisions of the fusion zone and elemental diffusion distributions in the welded joints were investigated. Furthermore, solidification microstructure and S-ferrite distribution in the weld metal of these steels are also discussed.