Nanoscale carbide precipitation in Co-28Cr-5Mo-0.3C implant alloy during martensite transformation

作者：Zangeneh Sh; Ketabchi M^*; Lopez H F

来源：Materials Letters, 2014, 116: 188-190.

DOI：10.1016/j.matlet.2013.11.018

• Biomaterials
• Nanoscale carbides
• Phase transformation

The precipitation of nanoscale carbides in Co-28Cr-5Mo-0.3C implant alloy during tungsten inert gas (TIG) welding has been systematically investigated. Based on the high resolution transmission electron microscopy (HRTEM) results, the nanoscale precipitates are Cr-rich M23C6-type carbides, with 10-100 nm in size, and precipitation mostly occurred at hcp/fcc interfaces. In addition, X-ray diffraction analysis (XRD) showed that higher amount of athermal epsilon-martensitic ( approximate to 2-fold those found in the solution-treated sample) can be achieved after the welding process. Apparently, the higher content of athermal martensite after welding is responsible for the precipitation of M23C6 carbides in nanoscale and significant enhancement of hardness (850 HVN) is the concomitant result of that.

• 出版日期2014-2-1