Grain boundary engineering（GBE） is a practice of improving resistance to grain boundary failure of the material through increasing the proportion of low Σ coincidence site lattice（CSL） grain boundaries（special g...Grain boundary engineering（GBE） is a practice of improving resistance to grain boundary failure of the material through increasing the proportion of low Σ coincidence site lattice（CSL） grain boundaries（special grain boundaries） in the grain boundary character distribution（GBCD）. The GBCD in a cold rolled and annealed Fe-18Cr-18Mn-0.63N high-nitrogen austenitic stainless steel was analyzed by electron back scatter difraction（EBSD）. The results show that the optimization process of GBE in the conventional austenitic stainless steel cannot be well applied to this high-nitrogen austenitic stainless steel. The percentage of low ΣCSL grain boundaries could increase from 47.3% for the solid solution treated high-nitrogen austenitic stainless steel specimen to 82.0% for the specimen after 5% cold rolling reduction and then annealing at 1423 K for 10 min.These special boundaries of high proportion efectively interrupt the connectivity of conventional high angle grain boundary network and thus achieve the GBCD optimization for the high-nitrogen austenitic stainless steel.展开更多
Although the pathological findings of coronavirus disease 2019(COVID-19)associated with acute respiratory distress syndrome(ARDS)have been reported in previous studies,the data of histopatho-logical features of end-st...Although the pathological findings of coronavirus disease 2019(COVID-19)associated with acute respiratory distress syndrome(ARDS)have been reported in previous studies,the data of histopatho-logical features of end-stage COVID-19 lungs are still lacking.We have previously reported the clini-cal features and managements of three COVID-19 patients with irreversible deterioration of pulmonary function who received lung transplantation(LT)after being supported by extracorporeal membrane oxygenation(ECMO)[1].展开更多
基金supported by National Natural Science Foundation of China(Nos.51201027 and 51271054)Fundamental Research Funds for the Central Universities of China(Nos.N110105001,N120405001 and N120505001)
文摘Grain boundary engineering（GBE） is a practice of improving resistance to grain boundary failure of the material through increasing the proportion of low Σ coincidence site lattice（CSL） grain boundaries（special grain boundaries） in the grain boundary character distribution（GBCD）. The GBCD in a cold rolled and annealed Fe-18Cr-18Mn-0.63N high-nitrogen austenitic stainless steel was analyzed by electron back scatter difraction（EBSD）. The results show that the optimization process of GBE in the conventional austenitic stainless steel cannot be well applied to this high-nitrogen austenitic stainless steel. The percentage of low ΣCSL grain boundaries could increase from 47.3% for the solid solution treated high-nitrogen austenitic stainless steel specimen to 82.0% for the specimen after 5% cold rolling reduction and then annealing at 1423 K for 10 min.These special boundaries of high proportion efectively interrupt the connectivity of conventional high angle grain boundary network and thus achieve the GBCD optimization for the high-nitrogen austenitic stainless steel.
基金This research was supported by the National Natural Science Foundation of China[grant numbers 81922041 and 81772020]the Science and Technology of Jiangsu Province China[grant number BK20170048]and Natural Science Fund for Colleges and Universities in Jiangsu Province[grant number 19KJB340001].
文摘Although the pathological findings of coronavirus disease 2019(COVID-19)associated with acute respiratory distress syndrome(ARDS)have been reported in previous studies,the data of histopatho-logical features of end-stage COVID-19 lungs are still lacking.We have previously reported the clini-cal features and managements of three COVID-19 patients with irreversible deterioration of pulmonary function who received lung transplantation(LT)after being supported by extracorporeal membrane oxygenation(ECMO)[1].
