固溶参数对Ti-5523钛合金力学性能和微观组织的影响

通过对新型的β型Ti-5523钛合金进行固溶处理,研究了固溶处理参数对其组织和力学性能的影响。研究结果表明:合金在双相区固溶空冷后的综合性能较水冷后的更为优异,空冷后的合金会析出更多不同形态和尺寸的初生α相,形态和尺寸强化作用更明显。合金在单相区固溶30 min、1 h后,两者β晶粒尺寸相差不大,固溶1 h后合金的性能更为优异。合金在双相区固溶后存在的第二相优化了合金的性能。与双相区固溶的合金相比,在单相区固溶的合金强度较低,但断后伸长率和断面收缩率高。经760℃/1 h/AC双相区固溶的合金的冲击韧性远优于840℃/1 h/AC单相区固溶的合金,两者的冲击韧性分别为50.25 J/cm^2和22 J/cm^2。

固溶处理对TB3小规格棒材晶粒尺寸和力学性能的影响

研究不同固溶热处理参数对TB3钛合金小规格棒材晶粒尺寸和力学性能的影响。结果表明,不同温度区间内固溶热处理晶粒尺寸的增速不同,当固溶温度大于820℃时,随温度升高晶粒尺寸显著增大。晶粒迅速长大后,继续延长固溶保温时间及改变固溶热处理的冷却方式对晶粒尺寸的影响不大,重复固溶热处理显著增大晶粒尺寸。固溶态室温强度与晶粒尺寸密切相关,晶粒尺寸越小,室温强度越高。

Optimization of Hydrothermal Treatment Parameters to Produce Chlorine-Free Alternative Solid Fuel from Plastic-Contained Municipal Solid Waste

An experimental study of the treatment of plastic-contained Japanese MSW （municipal solid waste） employing 1 ton capacity hydrothermal reactor to produce chlorine-free solid fuel has been performed. The system applies medium-pressure saturated steam at about 2 MPa in a stirred reactor for certain holding period. It was shown that the products exhibited organic chlorine conversion into inorganic chlorine, which can then be water washed. To obtain an optimal operating condition, the temperature and holding period was integrated into one parameter called RS （reaction severity）. It was found that to convert 75% organic chlorine in the MSW, the optimum RS number correlates to an operating temperature of about 225℃ and holding period of 90 min, or 235 ℃ for 60 min. Since hydrothermal treatment is a batch process, a shorter holding period is preferable to increase the number of batches and indirectly increase its processing capacity.