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在Gleeble-1500热模拟试验机上,通过单道次高温压缩变形实验,研究Nb-B复合高强度集装箱用钢的高温变形行为.结果表明:在本实验所采用的变形工艺参数范围内,实验钢在热加工硬化过程中,当应变速率为0.1和1 s~(-1)时,应变硬化指数n与真应变ε曲线上出现“单波峰”和“单波谷”;应变速率为5和15 s~(-1)时,应变硬化指数n与真应变ε曲线上出现“双波峰”和“双波谷”现象,在热加工硬化过程中的硬化机制以位错强化、孪晶强化和析出强化为主.根据Zener-Hollomon和Ludwik方程,对实验数据进行非线性拟合,得出在1123—1423 K范围内的变形激活能和应力指数分别为(428.188±20.109)kJ/mol和4.923,并建立了Z参数的表达式、热变形方程、动态再结晶的模型图.
The hot deformation behavior of Nb-B high-strength steel for container was investigated by single-pass high temperature compression deformation test on Gleeble-1500 thermal simulation test machine.The results show that in the range of deformation process parameters used in this experiment, experimental steel In the hot work-hardening process, the strain hardening index n and the true strain ε curve appear “single wave crest” and “single wave crest” when the strain rate is 0.1 and 1 s -1; the strain rate is 5 and 15 s ~ (-1), the phenomenon of “double crest” and “double trough” appear on the curve of strain hardening index n and true strain ε, and the hardening mechanism in the hot work hardening process is enhanced by dislocation , Twinning strengthening and precipitation strengthening.The nonlinear activation energies and stress exponents in the range of 1123-1423 K were (428.188 ± 20.109), respectively, based on the Zener-Hollomon and Ludwik equations, kJ / mol and 4.923. The Z parameter expression, thermal deformation equation and dynamic recrystallization model were established.