J.M. Gong
,
S.T. Tu
,
J. Xia and X. Ling (School of Mechanical Engineering
,
Nanjing University of Chemical Technology
,
Nanjing 210009
,
China)
金属学报(英文版)
Creep deformation localization is generally found in structures at high temperamture,typically in weldments. As the heat affected zone (HAZ) in a weldment is very narrow, deformation in HAZ region can hardly be measured by conventional displacement gauge. A new method for measuring long-term local creep deformation was developed by quartz optical fiber and technique of digital image analysis. The creep deformations of base metal, weld metal and HAZ in weldments are thereby determined with crossweld specimens.
关键词:
creep deformation
,
null
,
null
,
null
刘丽荣
,
金涛
,
赵乃仁
,
王志辉
,
孙晓峰
,
管恒荣
,
胡壮麒
金属学报
对一种镍基单晶高温合金在两种蠕变条件下(760℃/780 MPa 和 982℃/248 MPa)的变形机制进行分析. 结果表明: 在中温高应力条件下(760℃/780 MPa), 在低应变阶段,位错以堆垛层错的形式切入γ’相; 高应变阶段, 位错以位错对的方式切入γ'相. 在高温低应力条件下(982℃/248 MPa)的低应变阶段, 母相 a/2<110>位错在基体中运动弓出, 并绕过γ'相, 发生位错反应而形成位错网; 高应变阶段与中温高应力条件的切入机制相同.
关键词:
镍基单晶高温合金
,
creep deformation
,
dislocation
王丽丽
,
李嘉荣
,
唐定中
航空材料学报
doi:10.11868/j.issn.1005-5053.2015.1.002
制备了矿化剂为氧化铝的二氧化硅基陶瓷型芯,研究了矿化剂粉体粒径、形状等形貌特征对陶瓷型芯性能的影响.结果表明:随着氧化铝粉体粒径的增大,浆料流动性逐渐降低,加入氧化铝球形粉有利于改善浆料的充型性能;加入不规则形状氧化铝粉时,随着氧化铝粉体粒径的增大,型芯的烧结收缩率减小;加入球形氧化铝粉时,其粉体形状和粒径大小对收缩率和室温抗弯强度无明显影响,但导致较大的高温变形量.
关键词:
硅基陶瓷型芯
,
球形粉
,
收缩率
,
高温变形量
C.W.Ma
金属学报(英文版)
In this work, a parametric approach is presented and utilized to determine the creep properties of weldments; then the model of creep strain for cross weld specimen is given. On the basis of the experimental results, attempt has been made to establish equations of the isochronous stress-strain for weld joint that can predict the function of loading and service time in use of the creep data of base metal and weld metal.
关键词:
isochronous stress-strain curve
,
null
,
null
