V-N微合金化抗震钢筋高温析出行为分析  

Analysis on high-temperature precipitation behavior of V-N microalloyed anti-seismic rebars

作　　者：吕煜坤[1] 盛光敏[1] 黄振华[1] 薛昊飞[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《中南大学学报（自然科学版）》2014年第8期2596-2602,共7页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2007BAE30B05)

摘　　要：采用应力松弛方法,以热动力学为基础研究钒氮(V-N)微合金化抗震钢筋在奥氏体中的应变诱导析出行为。根据J-M-A(Johnson-Mehl-Avrami)理论,结合热力学软件Thermo-Calc定量计算等温过程奥氏体析出热动力学,并与实验测得PTT(precipitation–time–temperature)曲线进行对比,讨论不同V和N质量分数对钢筋V(C,N)析出行为的影响。研究结果表明:高V和低V质量分数抗震钢筋都在870℃左右的鼻温区析出动力过程加快,大变形量可缩短析出开始时间,VN(0.04 V-0.0135 N)钢筋实测与计算PTT曲线吻合,采用VFe(0.076 V-0.005 5 N)钢筋计算PTT曲线应该考虑形变储能ΔGs的作用。The strain induced precipitation behavior of V-N microalloyed anti-seismic rebars was studied by using stress relaxation technique based on the theoretical thermo-kinetic. According to J-M-A（Johnson-Mehl-Avrami） theory and combined with the thermodynamic software ＂Thermo-calc＂, precipitation thermo-kinetic theoretical analysis of austenitic in isothermal process was calculated quantitatively and then compared with the experimental measured PTT（precipitation–time–temperature） curve, the influence of V（C, N） precipitation behaviors between different V and N contents was discussed. The results show that the process of precipitation kinetic of high vanadium contents and low vanadium contents rebar are accelerated at nose temperature of 870 ℃. Precipitation starting time is shortened due to the larger deformation. Experimental PTT curve is in agreement with calculated result of VN（0.04 V-0.0135 N） rebar while calculated PTT curve of VFe（0.076 V-0.0055 N） rebar should take account of the role of deformation energy ΔGs.

关 键 词：V-N微合金钢 应力松弛 碳氮化物 析出 

分 类 号：TG151.3[金属学及工艺—热处理]