Effects of deformation temperature on the mechanical properties and microstructure of lean duplex stainless steels B2102 and S32101 have been investigated. It was found that the strength decreased continuously with in...Effects of deformation temperature on the mechanical properties and microstructure of lean duplex stainless steels B2102 and S32101 have been investigated. It was found that the strength decreased continuously with increases in temperature from -60 ℃ to 100 ℃. The strength of S32101 was higher than that of B2102 owing to its higher nitrogen content. Plasticity of B2102 increased with an increase in deformation temperature from - 60 ℃ and reached the optimal elongation ratio of 49% - 54% after deformation at 20 - 50 ^(2. Martensite transformation was observed during deformation due to the transformation-induced plasticity effect. The optimal elongation was achieved at deformation temperatures close to the Md(3O/50) temperatures of 62 ℃ and 6 ℃ for B2102 and S32101. respectively.展开更多
The ferrite-to-austenite phase transformation temperature of SA240-405 stainless steel was measured using the thermodilatometry method and calculated using Thermo-Calc. In addition, the effect of temperature and the s...The ferrite-to-austenite phase transformation temperature of SA240-405 stainless steel was measured using the thermodilatometry method and calculated using Thermo-Calc. In addition, the effect of temperature and the soaking time on the microstructural evolution was investigated for various quenching and tempering treatments. The results indicated that the ferrite-to-austenite transformation of this steel started between 795℃ and 832 ℃ and finished between 910 ℃ and 925℃. When the specimens were annealed above 1050℃, the austenite gradually transformed into ferrite; consequently, the content of as-quenched martensite decreased with increasing temperature. Moreover, when the specimens were quenched between 950 ℃ and 980℃, a microstructure of duplex phases comprising ferrite and martensite was obtained. Relatively high B-scale of Rockwell hardness( HRB ) values were observed for quenching times of 30-60 minutes; then, the hardness gradually decreased with increasing quenching time. Tempering at 730 ℃ resulted in ferrite and tempered martensite, and no obvious residual austenite was observed. In addition, the hardness gradually decreased with increasing tempering time.展开更多
基金sponsored by the Project of Shanghai Industrial Application of New and HighTechnologies in 2009
文摘Effects of deformation temperature on the mechanical properties and microstructure of lean duplex stainless steels B2102 and S32101 have been investigated. It was found that the strength decreased continuously with increases in temperature from -60 ℃ to 100 ℃. The strength of S32101 was higher than that of B2102 owing to its higher nitrogen content. Plasticity of B2102 increased with an increase in deformation temperature from - 60 ℃ and reached the optimal elongation ratio of 49% - 54% after deformation at 20 - 50 ^(2. Martensite transformation was observed during deformation due to the transformation-induced plasticity effect. The optimal elongation was achieved at deformation temperatures close to the Md(3O/50) temperatures of 62 ℃ and 6 ℃ for B2102 and S32101. respectively.
文摘The ferrite-to-austenite phase transformation temperature of SA240-405 stainless steel was measured using the thermodilatometry method and calculated using Thermo-Calc. In addition, the effect of temperature and the soaking time on the microstructural evolution was investigated for various quenching and tempering treatments. The results indicated that the ferrite-to-austenite transformation of this steel started between 795℃ and 832 ℃ and finished between 910 ℃ and 925℃. When the specimens were annealed above 1050℃, the austenite gradually transformed into ferrite; consequently, the content of as-quenched martensite decreased with increasing temperature. Moreover, when the specimens were quenched between 950 ℃ and 980℃, a microstructure of duplex phases comprising ferrite and martensite was obtained. Relatively high B-scale of Rockwell hardness( HRB ) values were observed for quenching times of 30-60 minutes; then, the hardness gradually decreased with increasing quenching time. Tempering at 730 ℃ resulted in ferrite and tempered martensite, and no obvious residual austenite was observed. In addition, the hardness gradually decreased with increasing tempering time.