Selective Cracking Development in a Selectively Laser Melted Nickel-based Superalloy
Various cracking mechanisms involved in selectively laser melted Inconel 738LC(Low carbon)have been investigated.It is demonstrated that large pores,inclusions and grain boundaries with special characteristics are particularly susceptible for cracking development.The grain boundary cracking,which accounts for the majority of the cracks in the as-fabricated samples,was found to be associated with segregation of W,Si and O and the presence of fine grains at the boundaries between two large neighbouring grains.Large grain misorientations have been observed at grain boundaries with or without cracks,suggesting that they do not inevitably lead to cracking development.
Selective laser melting nickel-based superalloy cracking mechanism misorientation segregation
Qiu Chunlei Chen Haoxiu Liu Qi
School of Materials Science and Engineering,Beihang University,Beijing 100191,China
国际会议
北京
英文
1756-1760
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）