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A new quenching-partitioning-tempering(Q-P-T) process was designed based on the recently developed quenching and partitioning(Q & P) treatment by Speer et al.The orientation relationships(ORs) of martensite(α) in Q-P-T steel tempered under different conditions were investigated using a scanning electron microscope with an electron backscatter diffraction unit.The morphology and crystallography of lath martensite within a packet were analyzed.Martensites exhibiting an initial austenite(α) grain in the orientation image map of different samples were chosen and their {111}α pole figures were drawn.The pole figures were fitted according to the ideal Kurdjumov-Sachs(K-S) and Nishiyama-Wasserman(N-W) ORs,which were calculated using Matlab and with a γ crystal-oriented(001)γ[100]γ as the reference frame.The martensite OR in the Q-P-T steel follows both the K-S and N-W ORs;however,the K-S OR is predominant.This characteristic does not change in the samples further tempered at different temperatures.
A new quenching-partitioning-tempering (QPT) process was designed based on the recently developed quenching and partitioning (Q & P) treatment by Speer et al. The orientation relationships (ORs) of martensite (α) in QPT steel tempered under different conditions were investigated using a scanning electron microscope with an electron backscatter diffraction unit. The morphology and crystallography of lath martensite within a packet were analyzed. Martensites exhibiting an initial austenite (α) grain in the orientation image map of different samples were chosen and their {111 } α pole figures were drawn. The pole figures were fitted according to the ideal Kurdjumov-Sachs (KS) and Nishiyama-Wasserman (NW) ORs, which were calculated using Matlab and with a γ crystal- oriented (001) γ [100] γ as the reference frame. martensite OR in the QPT steel follows both KS and NW ORs; however, the KS OR is predominant.This characteristic does not change in the samples further tempered at different t emperatures.