Hui ZHANG
,
Yuechen WANG
,
Feng LIU
,
Suhua AI
,
Qishan ZANG
,
Zhongguang WANG
材料科学技术（英文）
In-phase (IP) and out-of-phase (OP) thermal-mechanical fatigue (TMF) behavior of cast Ni-base superalloy K417 was studied. All experiments were carried out under total strain control with temperature cycling between 400~850℃. Both in-phase and out-of-phase TMF specimens exhibited cyclic hardening followed by cyclic softening at the minimum temperature. Besides, they cyclically hardened in the early stage of life followed by cyclic softening at the maximum temperature. OP TMF life was longer than that of IP TMF. Various damage mechanisms operating in different controlled strain ranges and phasing were discussed. A few life prediction methods for isothermal fatigue were used to handle TMF fatigue and their applicability to superalloy K417 was evaluated. The SEM analysis of the fracture surface showed that transgranular fracture was the principal cracking mode for both IP and OP TMF. Oxidation was the main damage mechanism in causing shorter fatigue life for IP TMF compared with OP TMF.
关键词:
Thermal-Mechanical fatigue
,
null
Liang ZHEN Yuexian CUI Dezhuang YANG Department of Materials Science
,
Harbin Institute of Technology
,
Harbin
,
150006
,
ChinaShenglong DAI Guifu YU Beijing Institute of Aeronautical Materials
,
Beijing 100095
,
China
材料科学技术（英文）
The formation of precipitation free zone (PFZ) and its effect in a RSP AI-Li alloy has been studied. The results show that PFZ is easy to form when aged at 190℃,but there is no equilibrium phase on grain boundaries.The growth of PFZ in the alloy is different from that in conventional AI-Li alloys, The effect of PFZ is of great importance because of its large volume fraction in the alloy.It offsets the beneficial effect of RSP,and is thought to be an important factor that leads to the poor toughness and low ductility of RSP AI-Li alloy sheet.
关键词:
precipitation free zone
,
null
,
null
,
null
ZHANG Qianxiang
,
University of Science and Technologys Beijing
,
Beijing
,
China
金属学报(英文版)
Activities and activity coefficients of Al in solid Cu-AI alloys have been determined by meansof solid electorlyte galvanic cells Al(a_1 , in alloy), Al_2O_3 ZrO_2·Y_2O_3 Ni, NiOand Al(a_1, in alloy), Al_2O_3 Na, βAl_2O_3 Al(a_2 , in alloy), Al_2O_3
关键词:
Cu-Al alloy
,
null
,
null
,
null
,
null
王宝峰
,
胡恩安
腐蚀学报（英文）
低伤害、耐高温缓蚀剂AI-811是以咪唑啉季铵盐为主 体，并复合含S、含酮、含酰胺的混合成分，适用于HCl、盐酸/氢氟酸（HCl/HF）及醋酸等 有机混合酸液体系.其主要特点是高温缓蚀效果好，可预防或大大降低酸液对低渗储层的伤 害，使用浓度低，气味极小，与酸液中的其他添加剂配伍性好，适用性强，与缓蚀增效剂AI -800协同使用可在高达190℃下显示独特的优良缓蚀性能.
用CC-10-S高温高压动态腐蚀实验仪对AI-811的高温缓蚀性能进行了评价.结果表明：AI-811 及其AI-800在高温、高压、动态条件下对各种酸溶液具有很好的缓蚀效果，可使N-80油管 钢在高达190℃的储层温度下腐蚀速度大幅度降低，平均腐蚀速度<100 g/m2·h.
关键词:
酸化缓蚀剂
,
high temperature
,
corrosion
王宝峰
,
胡恩安
腐蚀学报（英文）
doi:10.3969/j.issn.1002-6495.2001.05.011
低伤害、耐高温缓蚀剂AI-811是以咪唑啉季铵盐为主体,并复合含S、含酮、含酰胺的混合成分,适用于HCl、盐酸/氢氟酸(HCI/HF)及醋酸等有机混合酸液体系.其主要特点是高温缓蚀效果好,可预防或大大降低酸液对低渗储层的伤害,使用浓度低,气味极小,与酸液中的其他添加剂配伍性好,适用性强,与缓蚀增效剂AI-800协同使用可在高达190℃下显示独特的优良缓蚀性能.用CC-10-S高温高压动态腐蚀实验仪对AI-811的高温缓蚀性能进行了评价.结果表明:AI-811及其AI-800在高温、高压、动态条件下对各种酸溶液具有很好的缓蚀效果,可使N-80油管钢在高达190℃的储层温度下腐蚀速度大幅度降低,平均腐蚀速度＜100 g/m2@h.
关键词:
酸化缓蚀剂
,
腐蚀
,
高温
Zhenming XU
,
Tianxiao LI
,
Da SHU
,
Yaohe ZHOU
材料科学技术（英文）
Electromagnetic filtration primary Fe-rich phases (complex compound of AlFeSiMn) from Al-Si alloy melt containing 1.2 wt pet Fe have been studied by theoretical analysis and on a self-designed electromagnetic filtration equipment. The principle of the electromagnetic filtration is that the EMF (electromagnetic force) scarcely acts on the primary Fe-rich phases having low electric conductivity, which are then moved in the direction opposite to that of the EMF. Experimental results show that the primary Fe-rich phases are separated from AI-Si alloy melt and are collected in the filter while the melt is in horizontal flow. The removal efficiency of the primary iron-phases (eta) calculated is less as the greatest flow velocity of the melt (u(M)) and the height of the filter (2h) are larger, while it becomes larger as EMF, operating distance of electromagnetic force (x) and particle size (d(p)) become larger. It has been confirmed that the primary iron-phases larger than 20 mum can be removed efficiently by theoretical analysis and experiments. This new technique is high efficient and available for continuously flowing melts as compared with natural settling and filtration methods, which offer a Possibility for recycling high quality aluminum alloys.
关键词:
李萍
,
郝静燕
,
谭家隆
,
王清
,
董闯
,
李丽
金属功能材料
本文系统地研究了结构驰豫对Cu58.1Zr35.9AI6块状非晶合金弹性性能的影响.将Cu58.1Zr35.9AI6非晶合金在150℃、300℃、450℃分别保温1 h.测量退火样品的纵、横波声速,并推算其弹性性能.结果表明:随退火温度的升高,声速与弹性性能呈现逐渐增加的趋势.低温驰豫时声速与弹性性能变化缓慢,高温驰豫时增加明显.基于结构驰豫谱模型分析了上述现象的产生在于:提高温度,原子有足够的条件进行中程与长程扩散,通过发生原子的积聚重排,大量自由体积的湮灭,使非晶样品的有序度得到大大的改善.
关键词:
结构驰豫
,
超声波速度
,
弹性性能
孙永庆
,
梁剑雄
,
杨志勇
,
宋为顺
钢铁
研究了热处理对采用电炉+炉外精炼(LF)+电渣重熔冶炼的工业用和实验室50 kg真空感应炉+电渣重熔冶炼的试验用0Cr12Mn5Ni4M03AI高强度不锈钢带(0.8 mm和0.5 mm)的力学性能和组织的影响.结果表明,实验室得到的钢材更为洁净,组织中保留有合理的残余奥氏体含量;与采用同样热处理制度的工业钢带相比,在保持或提高伸长率的同时,抗拉强度提高50～85 MPa,杯突值提高1～3 mm;适当调节Cr、Ni的当量比以及采用合理的锻造、轧制工艺可以消除钢带组织中δ-铁素体的不利影响,更大限度发挥材料潜力.
关键词:
0Cr12Mn5Ni4M03AI
,
高强不锈钢
,
时效温度
,
力学性能
TIAN Sugui
,
SHAO Huimeng
,
ZHOU Longjiang
,
LI Tiefan
,
YANG Hongcai
,
HAO Shiming(Shenyang Polytechnic University
,
China) (State Key Laboratory of Corrosion and Protection. Institute of Corrosion and Protection of Metals. Chinese Academy of Sciences
,
Shenyang)(Northeastern University. Shenyang.China) Manuscript received 1 March 1995
金属学报(英文版)
The dynamic behaviour of transient liquid phase during sintering 5wt% Al-Cu alloy compacts with green density of 7.56g/cn~3 is observed by means of high temperature metallographic microscopy. The structures and precipitating order of the phases are identified by means of DTA, TEM and composion analysis at the definite point and phase diagram. The results show that little Al-rich liquid phase resulting from eutectic reaction flows into the capillaries in Cu powder, because the peritectic reactions exhausts the liquid in high density compact,the composition homogenization needs longer sintering time. The remainder γ2-phase is discovered at place of the neck of sintered Cu particle and has a crystallographic relationship of (111)_(Cu)∥(033)_γ_2 after alloy is sintered at 900 ℃for 3h.
关键词:
:transient liquid phase sintering
,
null
,
null
