HUANG Yan
,
MA Longxiang Northeast Universtity of Technology
,
Shenyang
,
China lecturer
,
Department of Metalforming
,
Northeast University of Technology
,
Shenyang 110006
,
China
金属学报(英文版)
Diffusion bonding of supcrplastic Al alloy LC4,with prior surface treatment of organic solution protecting coating after electroplishing and stainless steel wool brushing,was performed by Gleeble test machine under conditions ranged 490—530 ℃,1.0—3.0 MPa. 30—180 min and vacuum of 1.0×10~(-3) Pa.The joints were examined to have similar strength and microstructure to the base metal Discussion was made on the effect of superplastic treatment on bonding.The micromechanism for diffusion bonding of super- plastic metal was suggested as the migration of original bond interfaces caused by atomic diffusion and grain growth. Experimental results for the alloy as quench-aged state were presented to compare with the superplastic one.
关键词:
superplasticity
,
null
,
null
,
null
LI Dong-sheng
,
DAI Qi-xun
,
CHENG Xiao-nong
,
WANG Rong-rong
,
HUANG Yan
钢铁研究学报(英文版)
The kinetic curve of the high-temperature oxidation of austenitic stainless steel Cr18Ni11Cu3Al3MnNb at different temperatures was measured by weighting method. It is showed that the oxidation curves at 700 and 800 ℃ followed the parabolic law, and the steel presented an excellent anti-oxidation. The surface morphology and structure of the oxide film were studied by scanning electron microscopy and X-ray diffraction methods. A dense oxide film was attained at 700 and 800 ℃, mainly composed of the hexagonal Al2O3, Fe2O3, and a small amount oxide of Cr at 700 ℃. At 900 ℃ the oxide film started to delaminate, and was composed of (Cr,Fe)2O3 and the spinel CuCrMnO4 and Fe(Cr,Al)2O4.
关键词:
austenitic stainless steel
,
high-temperature oxidation
,
oxidation scale
,
cyclic oxidation
,
spinel
