铁素体不锈钢拉伸变形过程中的原位EBSD研究

In-situ EBSD analysis on ferritic stainless steel during tensile deformation

利用原位EBSD技术研究了铁素体不锈钢形变过程中组织和晶粒取向的演变过程。结果表明:随形变量的增加,小角晶界(1°<θ<2°)显著增多,大角晶界(θ>10°)保持相对稳定。当形变量<6%时,{100}<011>取向晶粒在轴向拉伸过程为稳定取向,而{111}<uvw>晶粒其拉伸轴取向向<100>-<101>连线方向转动一定角度(12°<α<20°)。具有不同转动特点的晶粒之间相互作用,使晶粒向着晶面法向转动,形成粗糙表面。

Microstructure and grain orientation evolution below 6% tensile deformation of ferritic stainless steel were investigated by means of ＂in-situ＂ EBSD.The results show that low angle grain boundary（1°θ2°） was enhanced rapidly and high angle grain boundary（θ10°） remained stable.{100}011 oriented grains hardly changed orientation but tensile direction of {111}uvw oriented grains rotated about 12° to 20° toward 100-101 line in inverse pole figure.Grain scale roughening was caused by rotation between neighboring grains with different orientation.