Z. Li
,
G.Q. Zhang
,
Z.H. Zhang
,
S.F. Tian
金属学报(英文版)
In order to evaluate the deformation characteristics of spray formed superalloy GH742
and determine the appropriate forging procedure of the alloy on this basis, the influence
of deformation temperature and strain rate on the ductility of spray formed GH742
was investigated by using the Gleeble-3500 thermal-mechanical testing machine. It is
shown that the forgeability of spray formed GH742 is better than conventional GH742
by ingot metallurgy because of refined grain structure and enhanced chemical homo-geneity of spray formed GH742. In the temperature range of 1020 to 1100℃, the
ductility of spray formed GH742 is dependent on the deformation temperature and is
increased linearly in proportion to the increment of deformation temperature, which
is more than 40% at 1020℃ and more than 60% at the temperature between 1100
and 1140℃. Furthermore, the results indicate the flow stress is affected considerably
by the deformation temperature and strain rate. In the temperature range of 1020 to
1140℃, the maximum flow stress of spray formed GH742 increases with the increment
of strain rate and decreases with the increment of the deformation temperature.
关键词:
spray forming
,
null
,
null
,
null
Y.J. Ge
,
G.Q. Zhang
,
Y.M. Liu
金属学报(英文版)
The surface modification of nanometer carbon material has been studied by usingan Induced Dielectric Barrier Discharge Plasma device (IDBD). The experimentalresults show that with different work gases and different discharge conditions, thesurface behaviors of carbon black can be changed according to needs, including theuse of different functional groups and the change of the surface roughness of carbonparticles etc., which increased the grinding and dispersion abilities in binder.
关键词:
surface modification
,
null
,
null
,
null
苏钰
,
符仁钰
,
李麟
上海金属
doi:10.3969/j.issn.1001-7208.2004.04.003
将St12Q1和St37-2G钢在两相区不同温度下加热和淬火,可以得到(F+M)的双相组织,与此同时研究实验用钢在不同热处理工艺下组织和力学性能的关系.结果表明:其应力-应变曲线表现出屈服点低、连续屈服、没有明显的屈服点等特性;提高两相区的淬火温度,可使马氏体量增多;在相同淬火加热温度下,淬火组织的马氏体量随钢的含碳量增加而增多;双相钢的强度只与它所含的马氏体量有关,而与马氏体中的含碳量无关.
关键词:
双相钢
,
金相组织
,
马氏体量
,
力学性能
余宏伟
,
王世森
,
王孝东
,
洪君
物理测试
针对鄂钢轧制的部分宽厚板表面出现结疤现象,应用金相显微镜、扫描电镜和能谱分析仪对Q345q热轧态钢板表面疤状物形态和成分进行观察,对形成原因进行分析并提出改进措施。结果表明：疤状缺陷为块状的非金属夹杂/渣,并在钢板表面形成凹坑,其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等,其主要为炼钢过程中的脱氧产物和合金的氧化产物。因此在生产过程中,通过去除钢水中夹杂物和清理铸坯等,减少非金属夹杂/渣,以提高钢板表面质量。
关键词:
Q345q
,
疤状缺陷
,
钢板
,
非金属夹杂
,
非金属夹渣
