１Cr17Ni2钢的热处理的性能研究

通过对１Cr17Ni2不锈钢相区变化的分析,从理论上阐述了１Cr17Ni2钢的热处理的机理,并通过实例给出了能够同时使１Cr17Ni2钢获和高韧性的热处理方法。     

1Cr17Ni2不锈钢平衡组织的预测及控制

1Cr 17Ni2不锈钢属于火电大机组零部件所采用的材料之一,因其组织中易产生铁素体而使钢的热加工工艺性能和热处理工艺性能下降。采用Thermo Calc软件对不同条件下1Cr 17Ni2不锈钢的平衡组织进行了定量计算,分析了温度和化学成分两因素对钢的平衡组织的影响规律,在此基础上提出了1Cr 17Ni2 不锈钢化学成分的控制范围和热加工及热处理的温度规范。结果表明,Thermo Calc预测结果与现有试验数据基本上吻合,可以用于指导1Cr 17Ni2 不锈钢的生产和使用。表1参9     

超临界、超超临界机组用超高强韧性螺栓材料30Cr3Ni3Mo钢的应用性能研究

SNCM630相应的国产牌号为30Cr3Ni3Mo。通过优化30Cr3Ni3Mo钢热处理工艺,其力学性能满足SNCM630材料的要求。30Cr3Ni3Mo钢的国产化成功,不仅解决了依赖成品进口的问题,降低了机组的制造成本,同时为我国螺栓用钢增加了一个新的牌号。     

1Cr12Ni2WMoVNbN材料热处理工艺研究

通过试验研究摸索了1Cr12Ni2WMoVNbN材料的机械性能和微观金相组织特性,确定了最佳热处理工艺。     

AP1000核电汽轮机主要部件选材分析

为了保证AP1000核电机组的长期安全可靠运行,对AP1000汽轮机主要部件选材进行了深入分析,结果表明,AP1000汽轮机转子采用超纯净30Cr2Ni4MoV钢,末级叶片采用马氏体时效强化钢0Cr17Ni4Cu4Nb等,主要部件选材合理,但汽缸、螺栓选材可以进一步优化,比如汽缸采用性能更优的2.25Cr-1Mo铸钢、螺栓采用淬透性更好的25Cr2MoV钢等。研究成果可为核电AP1000汽轮机进一步优化选材提供参考。     

1Cr12M2WMoVNbN材料热处理工艺研究

通过试验研究摸索了1Cr12Ni2WMoVNbN材料的机械性能和微观金相组织特性,确定了最佳热处理工艺.     

原苏联电站锅炉用钢概况及发展（二）

2.3 成分复杂的Cr-Ni型奥氏体钢简单成分的Cr-Ni型奥氏体钢在600～650℃下持久强度不太高,各国均对此类钢种进行了改进,以便把使用温度提高到650～700℃。为此,原苏联70年代在上述钢的基础上添加W、Mo、Nb、V、Ti及B等合金元素,开发了12Cr14Ni18W2NbB(695)、10Cr16Ni16W2NbMoB(184)及12Cr16Ni14W2NbMnB(17)。这些钢的特点是,在680～700℃下金相     

超超临界汽轮机用ZG13Cr9Mo2Co1VNbNB钢的组织与性能研究

介绍了1000MW等级超超临界汽轮机组大型铸件用材ZG13Cr9Mo2Co1VNbNB钢。通过相图计算、模拟焊后热处理,对比了材料的组织性能变化。试验结果表明:ZG13Cr9Mo2Co1VNbNB钢正火+高温回火后为典型的板条马氏体组织;材料中未形成Laves相;模拟焊后热处理降低了材料的屈服强度和韧性,塑性有所提高。     

大型齿轮渗碳时网状碳化物形成的原因及消除的方法

对17Cr2Ni2MoA钢渗碳网状碳化物形成的原因及控制方法进行了研究,结果表明,用特殊的方法消除网状碳化物是行之有效的,同时,根据碳化物状况可选择淬火温度。     

冷却速度对12Cr2Mo1钢显微组织和硬度的影响

为了研究不同冷却速度对12Cr2Mo1钢的显微组织和力学性能的影响,采用热膨胀法研究其相变特征,并通过快速相变仪、金相显微镜、扫描电子显微镜和显微硬度计对微观组织与形貌进行分析。结果表明,随着冷却速度的增加,钢的硬度值逐渐升高。这是由于12Cr2Mo1钢中的贝氏体含量逐渐增加,且向板条状转变造成的。该研究成果可为12Cr2Mo1钢的工业热处理工艺设计及应用提供参考。     

化学成分对1Cr 17Ni2钢金相组织和力学性能的影响

引进型的电站泵平衡鼓等零件采用１Ｃｒ１７Ｎｉ２钢制造。国产的１Ｃｒ１７Ｎｉ２钢的含镍量低,导致金相组织有大量的铁素体,从而影响力学性能,通过调整热处理工艺使材料达到了设计规定的技术要求。表７参２     

Effect of post-deposition heat treatment on electrodeposited NiCoCrAlY coatings

An electrolytic process was utilised to fabricate NiCoCrAlY coatings, involving deposition of a composite coating consisting of the (Ni,Co) matrix and CrAlY particles, followed by a diffusion heat treatment to convert the composite coating to the desired NiCoCrAlY microstructure. This study focused on the effects of the post-deposition heat-treating conditions (temperature and atmosphere) on the final coating microstructure and composition. The (Ni,Co)–CrAlY composite coatings were heat-treated for 2?h at 1000, 1100 and 1200°C in vacuum and Ar, respectively. Phase constituents and concentrations of the major elements in the coating after heat treatment were examined. Vacuum heat treatment at temperatures ≥1100°C resulted in a significant decrease in Cr content at the coating surface due to Cr evaporation. Heat treatment at 1200°C also caused outward diffusion of Ti from the substrate alloy to the coating layer.     

船用柴油机气门的强化特性探讨

本文简述了船用柴油机气门的强化要求与现状;探讨了奥氏作热强钢2Cr21Ni12N气门的强化特性与热处理工艺;分析了常温与高温条件下的强度、塑性、韧性的关系,以及高温疲劳强度与常温冲击韧性、微观金相组织之间的关系;探讨了冲击韧性指标的工程应用意义．     

Characterisation of as cast model Mn–Si–Cr–Ni steels for reactor pressure vessel applications

Abstract

Initial results are reported from a study aimed to investigate the role and influence of the elements Cr, Ni, Mn and Si on the radiation stability of reactor pressure vessel steels. Twelve as cast model ferritic steels with basic composition typical of those used in Russian WWER-1000 and Western PWR reactor pressure vessel materials were subjected to Charpy impact, magnetic Barkhausen noise (MBN), Vickers hardness tests and SEM examination. Higher Cr content in model steels was found generally to give increased RMS values independent of Mn and Si contents. The ductile–brittle transition temperatures (DBTT) and hardness values of the model steels were found to be independent of composition. Two steels, with low concentration of Ni and high concentration of Cr or vice versa , showed high transition temperatures (?16 and ?42°C respectively). An additional heat treatment to improve the properties is being considered for these compositions. The correlation between DBTT and MBN results has potential for rapid determination of the effect of composition and irradiation on the steel properties. The next stage of the assessment will investigate the effect of irradiation of the model steels to accumulated neutron fluences of ～10¹⁹ cm^?2.     

MIL-101(Cr)-NH2/CaCl2复合材料的热化学蓄热性能研究

将金属有机骨架MIL-101(Cr)-NH₂与CaCl₂通过浸渍的方法复合得到MIL-101(Cr)-NH₂/CaCl₂热化学蓄热复合材料。采用X射线衍射分析仪（XRD）、扫描电子显微镜（SEM）、能谱分析（EDS）、全自动比表面积及孔径分析仪以及同步热分析仪（TG-DSC）等分析了复合材料的表观形貌、盐含量、比表面积和蓄热密度等参数。结果显示,复合材料的盐含量为49%,在30℃、32%湿度下的最大吸水量为0.54 g(H₂O)/g(样品),蓄热密度达到了1 204 kJ/kg,并且在经历了17次吸附-解吸循环后,其蓄热密度仅降低了6.5%,表现出优异的循环稳定性,出色的吸附性能表明这一新型复合材料在太阳能蓄热领域具有广阔的应用前景。     

大截面叶片材料热处理性能研究

通过对1Cr13,2Cr13和1Cr12Mo的对比热处理试验，比较了在不同淬透截面条件下的淬透性，对于超出生产标准和国家标准规定的淬透截面的上述3种材料的叶片，认为通常使用的1Cr13淬透性不足，2Cr13和1Cr12Mo能够作为该种叶片的选材。     

Evaluation of Ni-Cr-P coatings electrodeposited on low carbon steel bipolar plates for polymer electrolyte membrane fuel cell

Polymer electrolyte membrane fuel cell (PEMFC) stacks suffer from the high cost and low volumetric energy of non-porous graphite bipolar plates. To resolve this problem, a bilayer coating consisting of Ni and Ni–Cr–P is deposited on AISI 1020 low-carbon steel using pulse electrodeposition. Ni/Ni–Cr–P-coated AISI 1020 is evaluated as a bipolar plate material for PEMFCs. Ni/Ni–Cr–P-coated substrates exhibit better corrosion resistance in both cathodic (air-purging) and anodic (H₂-purging) environment than the bare AISI 1020 substrate and lower interfacial contact resistance (ICR) than bare AISI 1020 and stainless steel. Further, it is expected to show better water management as the Ni/Ni–Cr–P coating is more hydrophobic than the bare substrate. Preliminary studies show that Ni/Ni–Cr–P-coated AISI 1020 plate can be a suitable candidate for replacing graphite as the bipolar plate of PEMFCs.     

30Cr1Mo1V钢转子锻件差异热处理工艺研究

用差异热处理的方法处理了３０Ｃｒ１Ｍｏ１Ｖ钢高、低压联合转子,使转子性能满足了设计要求,特别是低压侧的脆性转变温度ＦＡＴＴ５０降至工作温度以下。与原油冷工艺相比,差异热处理方法明显改善了转子的综合性能。