1.25Cr-0.5Mo钢在蠕变疲劳交互作用下的裂纹扩展分析

利用大型有限元分析软件ANSYS,模拟分析了石油化工高温设备中广泛使用的1.25Cr-0.5Mo钢在蠕变疲劳交互作用下的裂纹扩展行为,得出了裂纹在不同的条件下的扩展规律。分析过程中,采用了损伤累积的方法,对每个载荷步的裂纹扩展进行累积,提高了结果的可信度。     

9Cr-1.8W-0.5Mo-V-Nb耐热钢焊接接头的组织和性能

研究了9Cr-1．8W-0．5Mo-V-Nb耐热钢焊接接头的成分、显微组织及性能。结果表明：该耐热钢采用钨极氩弧焊打底＋焊条电弧焊盖面的焊接工艺可获得良好的焊接接头；焊缝区的显微组织为回火板条马氏体，局部区域有少量的δ铁素体，与母材正火＋回火态的显微组织类似，但晶粒相对粗大；热影响区的显微组织主要为回火马氏体；熔合线结合良好，组织均匀。     

Effects of Simulated Microstructure on the Creep Rupture of the Modified 9Cr-1Mo Steel

Journal of Materials Engineering and Performance - Microstructures of the heat-affected zone (HAZ) of a Gr. 91 steel weld were simulated to evaluate their effects on the creep life of the weld at...     

20MnMo,1.25Cr-0.5Mo,2.25Cr-1Mo钢的焊接

通过斜Y坡口焊接裂纹试验，研20MnMo，1．25Cr-0．5Mo，2．25Cr-1Mo的焊接性。针对3种钢的焊接性制定出合理的焊接工艺，并通过焊接工艺评定加以验证。     

1(1/4)Cr—(1/2)Mo耐热钢焊接工艺试验

本文介绍美国引进的1(1/4)Cr—(1/2)Mo耐热钢匹配以国产焊丝、焊条的工艺评定试验及现场工程应用。     

9Cr-3W-3Co耐热钢铸件微观结构观察及性能评价

研究评价了9Cr-3W-3Co耐热铸钢在630～650℃超超临界火力发电机组高温关键部件的应用可行性。通过真空感应熔炼制备了40 kg钢锭试验件,采用均质化+正火+回火的热处理工艺,系统分析了9Cr-3W-3Co钢在热处理过程中的组织演变及析出相变化,测试了铸件的常温和高温力学性能,特别是650℃高温持久性能。     

C-1.5Mn-2.5Ni-0.5Cr-0.5Mo合金焊缝组织的演化机制

利用光学显微镜、扫描电镜和透射电镜研究了C-1.5Mn-2.5Ni-0.5Cr-0.5Mo合金系焊缝金属的微观组织,并通过Thermal-calc软件计算焊缝金属Fe-Ni相图,进而研究了焊缝金属从液相凝固到室温组织整个相变过程。此外还测试了焊缝金属的基本力学性能。研究表明:液态金属初生相为δ-铁素体,并以柱状方式生长,形成δ-铁素体柱状晶。温度下降,δ-铁素体开始向奥氏体转变,奥氏体晶粒也以柱状方式生长,形成柱状奥氏体晶粒。温度继续下降,在奥氏体晶界处最先发生相变形成贝氏体,而奥氏体内部最后发生相变转变成马氏体。原奥氏体晶界形核以及贝氏体侧向形核导致贝氏体呈交织状分布。焊缝金属具有良好的低温韧性,这是因为组织中含有大量交织状贝氏体。     

Creep Constitutive Model and Component Lifetime Estimation: The Case of Niobium-Modified 9Cr-1Mo Steel Weldments

The θ-projection parametric method was used to analyze the creep strain versus time data, obtained in uniaxial tension, from weldments fabricated using a niobium-modified 9Cr-1Mo steel as the weld metal (Ellis, Private communication, 1991, provided the data). We used these data to illustrate a methodology whereby the θ-projection method may be used to obtain estimates of component design creep lifetimes, for specified sets of design stress, temperature, and strains. Furthermore, it is suggested that the creep strain results may be consistent with dislocation climb being the creep deformation mechanism in the alloy.     

High-temperature oxidation of 1.25Cr-0.5Mo steel in SO2

The oxidation kinetics of 1.25Cr-0.50Mo steel under different thermal cycling conditions in the range of 520–700°C in a 2000 ppm SO ₂-argon gas mixture have been studied by thermogravimetric techniques. The influence of the number of thermal cycles experienced by the specimen has been determined on the oxidation process. Characterization of the scales was performed by scanning electron microscopy, and it was found that the nature of the scale is a function of oxidation temperature.     

高温螺栓用钢1Cr-1/5Mo的研制

对1Cr-1/5Mo钢进行了试验研究,结果表明,通过调整材料的化学成分和热处理参数,可以生产出满足各项力学性能指标和技术要求的高温螺栓。