摘要
Duplex stainless steel UNS S31803 samples were cross-rolled with a true strain of ε = 2 followed by annealing at 1323 K for 2 min and 240 min, respectively. The distributions of intervariant boundary planes in the precipitated austenite（A） from ferrite（F） and phase boundary planes conforming to Kurdjumov-Sache（K-S） orientation relationship（OR） were characterized by electron backscatter diffraction（EBSD） and the five-para me ter analysis（FPA） method, respectively. The intervariant boundary planes with misorientation angle of 60° around 〈111 〉 and 〈011 〉 occur frequently and tend to terminate on the {111} plane. At the grain size level of 4 μm, the phase boundary appears to be connected with the K-S OR terminating on{110}F ｜｜ {111}A at the early stage of annealing. When the grain size reaches approximately 20 μm, phase boundary was modified into {541}F｜｜{533}A due to twinning in austenite during annealing.
Duplex stainless steel UNS S31803 samples were cross-rolled with a true strain of ε = 2 followed by annealing at 1323 K for 2 min and 240 min, respectively. The distributions of intervariant boundary planes in the precipitated austenite（A） from ferrite（F） and phase boundary planes conforming to Kurdjumov-Sache（K-S） orientation relationship（OR） were characterized by electron backscatter diffraction（EBSD） and the five-para me ter analysis（FPA） method, respectively. The intervariant boundary planes with misorientation angle of 60° around 〈111 〉 and 〈011 〉 occur frequently and tend to terminate on the {111} plane. At the grain size level of 4 μm, the phase boundary appears to be connected with the K-S OR terminating on{110}F ｜｜ {111}A at the early stage of annealing. When the grain size reaches approximately 20 μm, phase boundary was modified into {541}F｜｜{533}A due to twinning in austenite during annealing.
基金
financially by the National Natural Science Foundation of China (Nos. 51471100 and 51171095)
