中国科技论文在线

上传时间

2006年08月02日

【期刊论文】Raman spectra of carbon nanotubes and nanofibers prepared by ethanol flames∗

潘春旭， YUELI LIU， CHUNXU PAN‡， JIANBO WANG

JOURNAL OF MATERIALS SCIENCE 39(2004)1091-1094，-0001，（）：

-1年11月30日

摘要

53浏览
0点赞
0收藏
0分享
127下载
0

引用

上传时间

2006年08月02日

【期刊论文】Improved Microstructure and Properties of 6061 Aluminum Alloy Weldments Using a Double-Sided Arc Welding Process

潘春旭， Y.M. ZHANG， C. PAN， and A.T. MALE

METALLURGICAL AND MATERIALS TRANSACTIONS A VOLUME 31A, OCTOBER 2000-2539，-0001，（）：

-1年11月30日

摘要

Due to its popularity and high crack sensitivity, 6061 aluminum alloy was selected as a test material for the newly developed double-sided arc welding (DSAW) process. The microstructure, crack sensitivity, and porosity of DSAW weldments were studied systematically. The percentage of fine equiaxed grains in the fully penetrated welds is greatly increased. Residual stresses are reduced. Porosity in the welds is reduced and individual pores are smaller. It was also found that the shape and size of porosity is related to solidification substructure. In particular, a weld metal zone with equiaxed grains tends to form small and dispersed porosity, whereas elongated porosity tends to occur in columnar grains.