TiN纳米颗粒在ZGMn13中存在形式及对基体微观形貌的影响

Existing Forms of Ti N Nano Particles and Impacts on Matrix Microstructure of ZGMn13 Steel

利用吹氩加入法制备了含微量纳米Ti N的ZGMn13钢,研究了外加Ti N颗粒在高锰钢中的存在形式以及对奥氏体组织形态的影响。运用扫描电镜及其附带的能谱仪、透射电镜等手段,分析了Ti N和ZGMn13钢的微观组织形貌、化学成分以及相结构。结果表明,Ti N纳米粒子部分团聚长大,另一部分仍以纳米形态存在于奥氏体中,且与奥氏体具有较好的界面匹配关系;奥氏体与Ti N具有[1ˉ11]γ//[1ˉ11]N、(202)γ//(202)N,[1ˉ11]γ//[1ˉ11]N、(220)γ//(220)N,[1ˉ11]γ//[1ˉ11]N、(422)γ//(422)N以及[1ˉ12]γ//[0 1ˉ1]N、(220)γ//(022)N,[1ˉ12]γ//[0 1ˉ1]N、(1 1ˉ1)γ(200)N的晶体学位向关系,并且(1 1ˉ1)γ晶面与Ti N的(200)N晶面呈现共格现象;此外,基体奥氏体中存在着高密度相互缠结的位错,局部区域出现与奥氏体具有(1100)ε//(1 1ˉ3)γ、[0001]ε//[1 5ˉ2]γ的晶体学位向关系的相互平行的针状ε-马氏体,且两相界面共格。

ZGMn13 steel containing trace amounts of nanometer-sized TiN was prepared by the method of argon insuffla-tion. The existing forms of additional TiN particles and the influence on the morphology of high manganese steel were in-vestigated. The morphology, composition and structure of TiN and ZGMn13 steel were analyzed by SEM, EDS and TEM. The results show that part of TiN nano particles got together while the other existed in austenite in nanometer, and had a better matching relation with austenite. There were crystallographic orientation relationship of [ 1ˉ11]γ//[ 1ˉ11 ]N, （202）γ//（202）N, [ 1ˉ11]γ//[ 1ˉ11 ]N, （220）γ//（220）N, [ 1ˉ11]γ//[ 1ˉ11 ]N, （422）γ//（422）N and [ 1ˉ12]γ//[0 1ˉ1]N, （220）γ//（022）N, [ 1ˉ12]γ//[0 1ˉ1]N, （1 1ˉ1）γ//（200）N between austenite and TiN, and （1 1ˉ1）γ//（200）N had a phenomenon of coherency. There were high density and mutual entanglement dislocations in the matrix, local region appeared paralleledε-martensite which had the crystallo-graphic orientation relationship of （1100）ε//（1 1ˉ3）γ, [0001]ε//[1 5ˉ2]γwith austenite, and they were coherency.