An Atom Probe Investigation of Addition of Nitrogen in Hot Work Tool Steel
Two different hot work tool steels, QRO 90 and QRO 80N were investigated using atom probe tomography. QRO 90 is a commercial alloy while the other QRO 80N is an experimental test alloy. The main composition of QRO 90 is 0.38C-2.6Cr-2.3Mo-0.9V-0.75Mn (wt%) whereas QRO 80N has the composition 0.38C-1.7Cr-2.7Mo-1.2V-1.1Mn-0.044N (wt%). Hence the main difference between both materials is the nitrogen