WANG Yanli, JIA Guzhai, ZHANG Ting, WAN Mingming, JI Wei, MU Xiaoming. Dynamic mechanical behaviors of high-nitrogen austenitic stainless steel under high temperature and its constitutive model[J]. Explosion And Shock Waves, 2018, 38(4): 834-840. doi: 10.11883/bzycj-2016-0387
Citation:
WANG Yanli, JIA Guzhai, ZHANG Ting, WAN Mingming, JI Wei, MU Xiaoming. Dynamic mechanical behaviors of high-nitrogen austenitic stainless steel under high temperature and its constitutive model[J]. Explosion And Shock Waves, 2018, 38(4): 834-840. doi: 10.11883/bzycj-2016-0387
WANG Yanli, JIA Guzhai, ZHANG Ting, WAN Mingming, JI Wei, MU Xiaoming. Dynamic mechanical behaviors of high-nitrogen austenitic stainless steel under high temperature and its constitutive model[J]. Explosion And Shock Waves, 2018, 38(4): 834-840. doi: 10.11883/bzycj-2016-0387
Citation:
WANG Yanli, JIA Guzhai, ZHANG Ting, WAN Mingming, JI Wei, MU Xiaoming. Dynamic mechanical behaviors of high-nitrogen austenitic stainless steel under high temperature and its constitutive model[J]. Explosion And Shock Waves, 2018, 38(4): 834-840. doi: 10.11883/bzycj-2016-0387
Mechanical tests of high-nitrogen austenitic stainless steel (HNS) were performed at strain rates of 102-103 s-1 generated by a split Hopkinson bar apparatus and under different temperatures from 293 K to 873 K. The influences of strain rate and temperature on the plastic flow stress of HNS were analyzed by comparing the dynamic tests with quasi-static tests. The results show that the dynamic mechanical behavior of HNS is significantly sensitive to strain rate and temperature; the flow stress increases rapidly when strain rate exceeds 400 s-1; and at the same strain rate, the flow stress increases as temperature decreases. The coupling effect of strain rate and temperature on the plastic deformation behavior of HNS was investigated. The results indicate that the thermal softening effect plays a key role in the dynamic plastic deformation process of HNS. Based on the classical Johnson-Cook constitutive model, a modified Johnson-Cook constitutive model was given which can describe the dynamic mechanical behavior of HNS properly.
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