MI Guofa
,
LI Hongyu
,
LIU Xiangyu
,
WANG Kuangfei
钢铁研究学报(英文版)
The porous superalloy materials with hollow spherical pores were fabricated by using metal powder sintering process. The scanning electron microscope (SEM) observation was applied to the test samples and it revealed that the pores of the porous material exhibited a uniform distribution and the apertures were of same size in principle. The sintering necks appeared between adjacent particles on metal skeleton after sintering. The mechanical properties of the test samples were analyzed and the result showed that this kind of materials possessed excellent energy absorption capability, and the compression resistance decreased with increasing the porosity and aperture.
关键词:
porous superalloy material;metal powder sintering;hollow spherical pore;oriented linear pore
MI Guofa
,
LIU Xiangyu
,
WANG Kuangfei
,
FU Hengzhi
钢铁研究学报(英文版)
The numerical simulation technique was applied to the casting process of a valvetype part. The moldfilling and solidification stages of the casting were numerically analyzed. The filling behavior, solidification sequence, and thermal stress distribution were reproduced and the possible defects, such as cold shut and shrinkage, were predicted. Based on the simulation result, the doublegating system was replaced by a singlegating system. Meanwhile, the chills were used to regulate the solidification sequence of casting. To eliminate the cracks in the casting, the sand core was converted into a canulate one. By modifying the original process, the defects were eliminated and the casting with good quality was obtained.
关键词:
cast steel;valvetype part;numerical simulation;process modification
