含铜无取向电工钢中析出相及其析出机理

研究了含铜低碳低硅无取向电工钢中的析出相及其析出机理.由能谱(EDS)及选区电子衍射(SAED)分析可知,铁素体基体上存在的大量弥散分布的等轴状析出相为类B₂结构的铜.这些铜析出相的析出机理可以是一般析出、位错析出、台阶机理相间析出和弓出机理相间析出:一般析出在550、650和750℃三个等温温度均可发生;位错析出只发生在较低的等温温度(550℃),此时析出相呈特殊的平行短列状;台阶机理相间析出也可在上述三个等温温度下发生,但650℃等温时最有利于台阶机理相间析出,此时析出相平直列状分布;弓出机理相间析出只发生在较高的等温温度(750℃),析出相弯曲列状分布.

Precipitates and precipitation mechanism in non-oriented electrical steel containing copper

Precipitates in low-carbon low-silicon non-oriented electrical steel containing Cu were studied and the precipitation mechanism was analyzed by means of energy dispersive spectrometry (EDS) and selected area electron diffraction (SAED). It is found that the equiaxed precipitates of Cu with B₂-1ike structure distribute dispersively in the non-oriented electrical steel. The precipitation mechanism involves general precipitation, dislocation precipitation, interphase precipitations formed by the ledge mechanism and the bowing-out mechanism. General precipitation can occur at the three aging temperatures of 550, 650 and 750℃. Dislocation precipitation takes place only at low aging temperature (550℃), with a special form of parallel short rows. Interphase precipitation formed by the ledge mechanism is in a form of straight rows which can separate out at the above three aging temperatures, but the most appropriate temperature for precipitation is 650℃. Interphase precipitation formed by the bowing-out mechanism can occur only at high aging temperature (750℃), with a form of curve rows.