致密FGH95合金的高温变形特性研究

通过等温恒应变速率压缩实验，系统地研究了不同预处理，热力参数及分段变速变形对致密ＦＧＨ９５合金高温变形特性的影响，研究结果表明，经热等静压致密的ＦＧＨ９５合金坯料，可以通过适当的预处理，以改变ＦＧＨ９５合金中γ相的大小，形态及分布，从而降低合金的流动应力，对于经预处理的ＦＧＨ９５合金坯料，采用分段变速变莆可以进一步降低合金的流动应力。     

GH141合金和GH907合金的本构关系

在分析三种Ａｒｒｈｅｎｉｕｓ型方程对建立ＧＨ１４１和ＧＨ９０７合金本构关系适用性的基础上，提出了以Ｚｅｎｅｒ－Ｈｏｌｌｏｍｏｎ参数为主要变量，并综合考虑温度和变形程度对流动应力影响的建立本构关系的方法。本文提出的建立本构关系的方法对变形高温合金有普适性。     

贵金属光学金相图谱之八

图①Ｐｄ－Ａｇ－Ｇｄ合金（３２×）浸蚀剂（ＨＣｌ＋ＣｒＯ３）,铸态组织,具有明显的树枝晶偏析。Ｅｔｃｈａｎｔ（ＨＣｌ＋ＣｒＯ３）,ｃａｓｔｓｔａｔｅ,ｂｒａｎｃｈｃｒｙｓｔａｌｓｅｇｒｅｇａｔｉｏｎｏｂｖｉｏｕｓ．图②Ａｕ－ＲＥ合金（６００×）浸蚀剂...     

GH907合金锻造及热处理工艺参数的研究

在ＧＨ９０７合金的锻件生产中有时出现超声波探伤及室温塑性不合格的问题，为此本对ＧＨ９０７合金的锻造和热处理工艺进行了探索研究，正交试验结果表明，影响ＧＨ９０７锻件晶粒度和室温塑性的工艺因素的主次顺序是锻造温度、变形程度和热处理制度得到的较优工艺是：９４０℃，５５％变形＋９８０℃，１ｈ，空冷＋７２０℃，４ｈ，空冷。直接时效工艺９８０℃，１ｈ，３５％变形＋７７５℃，８ｈ，炉冷＋６２０℃，８ｈ，空冷也     

EFFECT OF PHOSPHORUS ON SOLIDIFICATION,ELEMENT SEGREGATION AND η-PHASE PRECIPITATION IN GH 761 ALLOY

本文用金相、电子探针等方法研究了磷对ＧＨ７６１合金凝固过程、元素偏析及η相析出的影响。结果表明，随合金中磷含量升高，磷大量地偏析于枝晶间，强烈地降低合金的终凝温度，促进Ｔｉ，Ｎｉ等元素的偏析，抑制Ｍｏ，Ｂ，Ｓ，Ｓｉ等元素的偏析，磷显著地促进η相的析出，降低η相析出温度。     

磨削GH4169高温合金时砂轮表面的粘附与磨削比的研究

本文借助扫描电子显微镜，观察和分析了用ＷＡ４６ＫＶ和ＳＡ４６ＫＶ砂轮磨削ＧＨ４１６９高温合金时砂轮表面的粘附现象，研究了ＷＡ４６ＫＶ和ＳＡ４６ＫＶ砂轮磨削ＧＨ４１６９高温合金时磨削参数对磨削比的影响规律。得出了磨削ＧＨ４１６９高温合金时磨削比低的主要原因是砂轮粘附所引起的重要结论。     

在600－800℃低氧压下Co－Nb合金的氧化

研究了含１５与３０ｗｔ％Ｎｂ的两种Ｃｏ－Ｎｂ合金在６００－８００℃低氧压Ｆ的氧化性能选择的氧压低于相应温度的氧化钴分解压，由Ｈ２－ＣＯ２混合气获得，在６００℃为１０－２４ａｔｍ，而７００与８００℃为１０－２０ａｔｍ．两种合金在６００与７００℃氧化结果仅产生由α－ＣＯ与氧化铌（ＮｂＯ２与Ｎｂ２Ｏ５）混合物组成的内氧化带在７００℃尚可能生成双元氧化物ＣＯＮｂ２Ｏ６在内氧化带界而无贫Ｎｂ层可见．两会金，尤其是Ｃｏ－３０Ｎｂ在８００℃时发生了由内氧化向外氧化的转变，伴随有贫Ｎｂ的单相区出现于合金的表层．从Ｃｏ中Ｎｂ的溶解度很低和合金与氧化膜显微组织的特点等角度详细讨论了合金的腐蚀机制．     

磷含量对GH761合金凝固,偏析及η相析出的影响

本文用金相、电子探针等方法研究了磷对ＧＨ７６１合金凝固过程、元素偏析及η相析出的影响。结果表明，随合金中磷含量升高，磷大量地偏析于枝晶间，强烈地降低合金的终凝温度，促进Ｔｉ，Ｎｉ等元素的偏析，抑制Ｍｏ，Ｂ，Ｓ，Ｓｉ等元素的偏析，磷显著地促进η相的析出，降低η相析出温度。     

GH718合金氢渗透特性的研究

ＧＨ７１８合金氢渗透特性的研究徐坚，孙秀魁，刘清泉，陈文绣（中国科学院金属研究所，快速凝固非平衡合金国家重点实验室沈阳１１００１５）１前言ＧＨ７１８（ＩＮＣＯＮＥＬ７１８）合金广泛用作为涡轮叶片、氢燃发动机、核反应堆器壁等部件的材料．由于使用环境中氢...     

GH30和GH34合金的蠕变－疲劳交互作用SCIEI

研究了ＧＨ３０和ＧＨ３４合金的蠕变－疲劳交互作用，观察到两种负交互作用：ＧＨ３０合金在先蠕变后疲劳的条件下的负交互作用和ＧＨ３４合金在连续循环蠕变的条件下的负交互作用。前者的交互作用项中疲劳损伤指数远大于蠕变损伤指数。因而负交互作用主要是由于预蠕变部分地抑制了后续疲劳的损伤。后者的交互作用项中的蠕变损伤指数远大于疲劳损伤指数。因而负交互作用主要是由于疲劳部分地消除了蠕变损份。还用微观观察的结果分析了这两种负交互作用的微观本质。     

GH131合金二辊斜轧穿孔工艺研究

研究了二辊斜轧穿孔工艺因素对 GH131合金毛管质量及穿孔作用力的影响。指出轧辊转速是影响毛管质量的主要因素,轧辊转速低,管坯易出现孔腔,转速较高时毛管易出现分层。若将轧辊转速降到出现分层的临界转速以下,增大前进角,选择合理的加热温度和变形量,则可以完全消除 GH131合金的孔腔和分层缺陷。     

高温合金的热穿孔工艺

在以斜轧穿孔的方式穿制冷轧-冷拔用毛管时,管坯的热穿孔工序是高合金钢钢管生产的关键。本文总结了在Ф76mm穿孔机上生产GH30、GH36、GH39和GH140等高温合金管的管坯热穿孔工艺及操作经验。     

108三辊穿孔的现状

简介了108三辊穿孔机的主要性能和中间试验、试生产以及改进情况。总结了该机匹配三辊轧管机组投产以来的生产经验。对可穿钢种、荒管规格、内外表面质量、壁厚精度以及顶头状况进行了介绍。该机以减径穿孔为主,适于穿制低塑性荒管和连铸坯,D/S在6.85的最佳范围內可高速穿孔获得优质荒管,宜于匹配具有大变形量或生产中等壁厚的延伸机机组。     

新型三辊定心装置的研制与应用

江西洪都钢厂研制的穿孔新型定心装置结构紧凑，定心准确可靠，对提高穿孔毛管质量效果明显。该装置还具有辊子磨损后调整方便，运行平稳，零部件不易损坏，节省维修费用，降低能耗等诸多特点。     

Stress corrosion cracking of alloy 600 in an aqueous solution containing lead oxide

The stress corrosion cracking (SCC) behavior of Alloy 600 was studied in aqueous solutions containing lead. Electrochemical polarization and current transient experiments were performed at 315 °C in a 40% sodium hydroxide solution to assess the effect of lead on a passive film formed on Alloy 600. The influences of the alloy microstructure and the addition of an inhibitor to the environments on lead-induced SCC were investigated using C-ring and slow strain-rate tensile (SSRT) tests in demineralized high-purity water and caustic solutions containing PbO at 315 °C. The surface films on Alloy 600 were examined using Auger electron spectroscopy (AES) and energy dispersive x-ray spectroscopy (EDXS). The PbO markedly accelerated SCC of Alloy 600 in the caustic solution and the high-purity water at 315 °C. The addition of nickel boride (NiB) or cerium boride (CeB₆) to the test solutions decreased the susceptibility of Alloy 600 to SCC. Thermally treated Alloy 600 (Alloy 600 TT) tended to crack in a transgranular mode, while the solution-annealed Alloy 600 (Alloy 600 SA) tended to crack in an intergranular mode in water containing PbO.     

The effect of prior deformation on stress corrosion cracking growth rates of Alloy 600 materials in a simulated pressurized water reactor primary water

The effect of prior deformation on stress corrosion cracking (SCC) growth rates of Alloy 600 materials in a simulated pressurized water reactor primary water environment is studied. The prior deformation was introduced by welding procedure or by cold working. Values of Vickers hardness in the Alloy 600 weld heat-affected zone (HAZ) and in the cold worked (CW) Alloy 600 materials are higher than that in the base metal. The significantly hardened area in the HAZ is within a distance of about 2-3 mm away from the fusion line. Electron backscatter diffraction (EPSD) results show significant amounts of plastic strain in the Alloy 600 HAZ and in the cold worked Alloy 600 materials. Stress corrosion cracking growth rate tests were performed in a simulated pressurized water reactor primary water environment. Extensive intergranular stress corrosion cracking (IGSCC) was found in the Alloy 600 HAZ, 8% and 20% CW Alloy 600 specimens. The crack growth rate in the Alloy 600 HAZ is close to that in the 8% CW base metal, which is significantly lower than that in the 20% CW base metal, but much higher than that in the as-received base metal. Mixed intergranular and transgranular SCC was found in the 40% CW Alloy 600 specimen. The crack growth rate in the 40% CW Alloy 600 was lower than that in the 20% CW Alloy 600. The effect of hardening on crack growth rate can be related to the crack tip mechanics, the sub-microstructure (or subdivision of grain) after cross-rolling, and their interactions with the oxidation kinetics.     

Effect of microstructure on stress corrosion cracking of alloy 600 and alloy 690 in 40% NaOH

Stress corrosion cracking (SCC) behaviors of Alloy 600, Alloy 690 and the Ni-10Cr-10Fe alloy have been studied using a C-ring in 40% NaOH solution at 315°C. The current density of Alloy 690 in polarization curves was higher at 200 mV above corrosion potential than that of Alloy 600. SCC resistance increased with Cr content for the chromium carbide free alloys, probably due to facilitation of SCC crack tip blunting with an increase in Cr content. Both thermally treated Alloy 600 and sensitized Alloy 600 have a comparable amount of intergranular carbide. But the former is more resistant to SCC than the latter, which might be attributed to the presence of the slight Cr depletion around the grain boundary in the former one. Sensitized Alloy 600 showed higher SCC resistance than the solution annealed one due to intergranular carbide in sensitized Alloy 600. This implies that the beneficial effect of intergranular carbide overrides the harmful effects of Cr depletion for sensitized Alloy 600. SCC resistance of Alloy 600 increased with grain size. This article based on a presentation made in the symposium “The 4th International Conference on Fracture and Strength of Solid”, held at POSTECH, Pohang, Korea, August 16–18 under the auspices of Far East and Ocean Fracture Society (FEOFS),et al.     

1Cr18Ni9Ti荒管内壁裂纹的试验研究

介绍了1Cr_(18)Ni9Ti 荒管内壁裂纹的试验研究情况。研究了管坯的化学成分、α相、穿孔工艺对内裂的影响,通过典型对比分析,认为内裂产生的主导原因在于管坯的加热、变形量、穿孔工具的设计及穿孔机的调整参数是否合理。     

顶杆转交装置的改进

简述了宝钢无缝钢管厂曼式穿孔机顶杆转交装置改进的原因。介绍了该顶杆转交装置改进后的结构以及所采用的转交翻料钩的外形设计。使用改进后的顶杆转交装置,改善了更换装置的工况,保证了穿孔质量,大大地减小了噪音。     

模锻工艺对高温合金性能的影响

就模锻加热工艺 ,模锻变形工艺 ,模锻冷却工艺对 GH36、GH132、GH4 133B等合金的组织和性能的影响作了说明