The explosive hardening of high Mn Steel was simulated by using light gas gun under selected ranges of impact load from 10 to 20 GPa and pulse duration from 0.04 to 1.6μs.The experi- mental results showed that a lot ...The explosive hardening of high Mn Steel was simulated by using light gas gun under selected ranges of impact load from 10 to 20 GPa and pulse duration from 0.04 to 1.6μs.The experi- mental results showed that a lot of twins formed in the shocked high Mn steel may be the prin- cipal cause of explosive hardening.展开更多
Two steels without and with Nb addition were chosen to investigate the effects of Nb on the microstructures and the mechanical properties of Fe-Mn-Al-Si steels.The results revealed that Nb refined the grains markedly ...Two steels without and with Nb addition were chosen to investigate the effects of Nb on the microstructures and the mechanical properties of Fe-Mn-Al-Si steels.The results revealed that Nb refined the grains markedly and both TRIP and TWIP effects occurred during deformation process.The Nb containing steel possesses higher yield strength and much lower tensile strength , the latter being explained by the suppression of TRIP effect due to the increase of stacking fault energy.This indicates grain refining is secondary for strengthening of steels when TRIP or TWIP effect exists during the deformation of low carbon and high Mn steels.展开更多
Super-ductile and high strength manganese TWIP steels have received much attention in recent years.In the present work,two high Mn high Al steels with different stacking fault energies were investigated, microstructur...Super-ductile and high strength manganese TWIP steels have received much attention in recent years.In the present work,two high Mn high Al steels with different stacking fault energies were investigated, microstructures were examined and mechanical properties were measured.The results showed that Fe-26Mn-6Al- 1C steel（6Al steel） exhibits high tensile strength and Fe-26Mn-12Al-1C steel（12Al steel） possesses a very high strength.Both steels exhibit good ductility.For 6Al steel with a moderate stacking fault energy（60 mJ/m;）, twinning is the major deformation mechanism;while dislocation slip dominates the deformation process of 12Al steel with stacking fault energy of 90 mJ/m;.展开更多
Deformation-induced microstructures of high-Mn austenite steel was investigated by metallography,X-ray diffraction and SEM.The ε-martensite and slip-bands are deformation-in- duced on the{111} planes,and appear as th...Deformation-induced microstructures of high-Mn austenite steel was investigated by metallography,X-ray diffraction and SEM.The ε-martensite and slip-bands are deformation-in- duced on the{111} planes,and appear as thin straight laths with 60～80° alignment difference be- tween them.It was found that ε-martensite and slip bands are kinked at fcc twin boundaries with the kinked angle 35～40°.The bands of equilateral triangle in the microstructure of tensile deformation are presented.展开更多
Fe-Cr-Mn(W, V) austenite steels used as low radioactive structural materialsin fusion reactor have been investigated. The results show that the high temperature strength andthe creep fracture life of Fe-Cr-Mn(W, V) st...Fe-Cr-Mn(W, V) austenite steels used as low radioactive structural materialsin fusion reactor have been investigated. The results show that the high temperature strength andthe creep fracture life of Fe-Cr-Mn(W, V) steels can be effectively improved through (C+N)complex-strengthening, so can be the high temperature ductility. The strength and ductility of thesteels are superior to that of SUS316 steels and JPCAS below 673 K. The relationship betweenstrength, ductility and the formation temperature is related to the evolution of deformationmicrostructure. The fracture and microstructure observation above 673 K indicates that the main wayto further improve ductility at high temperature is the control of carbide coarsening at the grainboundaries.展开更多
Results presented in this study contribute to investigation of the microstructure and mechanical properties of the hot-rolled Fe16Mn0.6C steel plates.The steel plates have been produced by being hot-rolled at temperat...Results presented in this study contribute to investigation of the microstructure and mechanical properties of the hot-rolled Fe16Mn0.6C steel plates.The steel plates have been produced by being hot-rolled at temperatures ranging from 1100℃ to 850℃ in seven passes to 97.5% reduction in thickness and then cooled in a furnace of 650℃.Some plates have been annealed at temperatures ranging from 300℃ to 1100℃ for 5min to 60min,and then followed by water quenching.There are annealing twins in the hot-rolled Fe16Mn0.6C steel.Fe16Mn0.6C steel presents similar ductile behavior as X-IPTM steel,but much higher elongation than commercial martensitic steel (MP) 1000,dual phase (DP) 980,and transformation induced plasticity (TRIP) 980 steels.Fe16Mn0.6C steel experiences γε (-α) transformation in some local regions,but remains mostly austenite during the entire deformation process.Fe16Mn0.6C steel with special mechanical properties can be produced by using the appropriate anneal technology.Twinning induced plasticity(TWIP) effect only occurs in the Fe16Mn0.6C steel annealed at temperature higher than 900℃.展开更多
文摘The explosive hardening of high Mn Steel was simulated by using light gas gun under selected ranges of impact load from 10 to 20 GPa and pulse duration from 0.04 to 1.6μs.The experi- mental results showed that a lot of twins formed in the shocked high Mn steel may be the prin- cipal cause of explosive hardening.
基金Item Sponsored by Open Project Foundation of State Key Lab of Rolling and Automation of China ( 2009001 )Fundamental Research Foundation of Central Universities of China ( N100602004 , N100402006 )
文摘Two steels without and with Nb addition were chosen to investigate the effects of Nb on the microstructures and the mechanical properties of Fe-Mn-Al-Si steels.The results revealed that Nb refined the grains markedly and both TRIP and TWIP effects occurred during deformation process.The Nb containing steel possesses higher yield strength and much lower tensile strength , the latter being explained by the suppression of TRIP effect due to the increase of stacking fault energy.This indicates grain refining is secondary for strengthening of steels when TRIP or TWIP effect exists during the deformation of low carbon and high Mn steels.
文摘Super-ductile and high strength manganese TWIP steels have received much attention in recent years.In the present work,two high Mn high Al steels with different stacking fault energies were investigated, microstructures were examined and mechanical properties were measured.The results showed that Fe-26Mn-6Al- 1C steel（6Al steel） exhibits high tensile strength and Fe-26Mn-12Al-1C steel（12Al steel） possesses a very high strength.Both steels exhibit good ductility.For 6Al steel with a moderate stacking fault energy（60 mJ/m;）, twinning is the major deformation mechanism;while dislocation slip dominates the deformation process of 12Al steel with stacking fault energy of 90 mJ/m;.
文摘Deformation-induced microstructures of high-Mn austenite steel was investigated by metallography,X-ray diffraction and SEM.The ε-martensite and slip-bands are deformation-in- duced on the{111} planes,and appear as thin straight laths with 60～80° alignment difference be- tween them.It was found that ε-martensite and slip bands are kinked at fcc twin boundaries with the kinked angle 35～40°.The bands of equilateral triangle in the microstructure of tensile deformation are presented.
文摘Fe-Cr-Mn(W, V) austenite steels used as low radioactive structural materialsin fusion reactor have been investigated. The results show that the high temperature strength andthe creep fracture life of Fe-Cr-Mn(W, V) steels can be effectively improved through (C+N)complex-strengthening, so can be the high temperature ductility. The strength and ductility of thesteels are superior to that of SUS316 steels and JPCAS below 673 K. The relationship betweenstrength, ductility and the formation temperature is related to the evolution of deformationmicrostructure. The fracture and microstructure observation above 673 K indicates that the main wayto further improve ductility at high temperature is the control of carbide coarsening at the grainboundaries.
基金supported by the Key Research Foundation of Baoshan Iron & Steel Co.,Ltd.(No.D06EBEA207)
文摘Results presented in this study contribute to investigation of the microstructure and mechanical properties of the hot-rolled Fe16Mn0.6C steel plates.The steel plates have been produced by being hot-rolled at temperatures ranging from 1100℃ to 850℃ in seven passes to 97.5% reduction in thickness and then cooled in a furnace of 650℃.Some plates have been annealed at temperatures ranging from 300℃ to 1100℃ for 5min to 60min,and then followed by water quenching.There are annealing twins in the hot-rolled Fe16Mn0.6C steel.Fe16Mn0.6C steel presents similar ductile behavior as X-IPTM steel,but much higher elongation than commercial martensitic steel (MP) 1000,dual phase (DP) 980,and transformation induced plasticity (TRIP) 980 steels.Fe16Mn0.6C steel experiences γε (-α) transformation in some local regions,but remains mostly austenite during the entire deformation process.Fe16Mn0.6C steel with special mechanical properties can be produced by using the appropriate anneal technology.Twinning induced plasticity(TWIP) effect only occurs in the Fe16Mn0.6C steel annealed at temperature higher than 900℃.
