Mn-Mo-Nb-B低碳微合金钢的应变诱导析出  

Strain-Induced Precipitation in Mn-Mo-Nb-B Low Carbon Microalloyed Steel

作　　者：刘明哲[1] 苑少强[2] 刘义[1] 梁国俐[2] 

机构地区：[1]河北钢铁集团有限公司,河北石家庄050000 [2]唐山学院科研处,河北唐山063000

出　　处：《钢铁研究学报》2010年第3期29-33,共5页Journal of Iron and Steel Research

基　　金：河北省自然科学基金-钢铁联合研究基金资助(E2008001141)

摘　　要：采用热模拟及透射电子显微镜结合纳米束能谱技术,研究了Mn-Mo-Nb-B系多元微合金钢奥氏体变形后等温过程中(松弛)的析出行为。实验结果表明:经变形后,在850℃和900℃保温过程中,Mn-Mo-Nb-B多元微合金钢析出颗粒尺寸在各个阶段均小于相同工艺下Nb-Ti钢中析出相的尺寸。统计结果显示,析出颗粒的尺寸均复合正态分布,并且峰位尺寸接近平均尺寸。析出相中Nb/Ti比随着松弛时间而增大。松弛阶段后期,Mo进入(Ti,Nb)(C,N)的晶格当中,其含量随着时间的延长而增加。Thermo-simulation test, transmission electron microscopy（TEM） and nanobeam EDS technique were used to investigate the strain induced precipitation behavior during relaxation process after deformed austenite in Mn-Mo-Nb-B low carbon multi-microalloyed steel. The experiment results indicate that during isothermal holding at 850 ℃ and 900℃ after predeformation, the size of precipitates occurred in the Mn-Mo-Nb-B steel at the different stage are smaller than that happened in the only Nb and Ti-bearing microalloyed steel. The results of statistics show that the distribution of particle size corresponds to the normal one with the peak size approaching to the mean value. The ratio of Nb/Ti of precipitates increased with the relaxing time. After longer holding, Mo atoms would enter the lattice of （Nb,Ti）（C, N） precipitates and its concentration in the precipitates increased with the relaxation time prolonged.

关 键 词：Mn—Mo—Nb—B微合金钢 等温松弛 应变诱导析出 碳氮化物 

分 类 号：TG142.7[一般工业技术—材料科学与工程]