Porosity in millimeter-scale welds of stainless steel : three-dimensional characterization.

Aagesen, Larry K. (University of Michigan, Ann Arbor, MI) ; Madison, Jonathan D.

关键词: DISTRIBUTION;    LASERS;    METALLOGRAPHY;    MICROSTRUCTURE;    MORPHOLOGY;    POROSITY;    PROCESSING;    SOLIDIFICATION;    SPATIAL DISTRIBUTION;    STAINLESS STEELS;    TOMOGRAPHY;    VELOCITY;   

DOI  :  10.2172/1044948
RP-ID  :  SAND2012-4474
PID  :  OSTI ID: 1044948
Others  :  TRN: US201214%%1045

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

A variety of edge joints utilizing a continuous wave Nd:YAG laser have been produced and examined in a 304-L stainless steel to advance fundamental understanding of the linkage between processing and resultant microstructure in high-rate solidification events. Acquisition of three-dimensional reconstructions via micro-computed tomography combined with traditional metallography has allowed for qualitative and quantitative characterization of weld joints in a material system of wide use and broad applicability. The presence, variability and distribution of porosity, has been examined for average values, spatial distributions and morphology and then related back to fundamental processing parameters such as weld speed, weld power and laser focal length.