正火工艺对非调质钢48MnV组织性能的影响

Effect of normalizing technology on the structure and properties of non-quenched-tempered steel 48MnV

非调质钢锻件,由于其钢种特性及生产过程不稳定,常造成零件性能偏差,而通过正火可以有效改变非调质钢强韧性匹配及组织形貌,扩大其适用范围。研究表明：在850~1150℃进行正火后,随着正火温度的升高,非调质钢48MnV钢材的强度升高,塑、韧性下降,显微组织晶粒尺寸增大。1050℃以上正火时,钢材显微组织粗化明显。采用950℃正火,48MnV非调质钢可以得到最佳的强韧性匹配及细小均匀的显微组织。

Due to the characteristics and the instability of production process,it is common that the forgings of non-quenched and tempered steel have bad strength and plasticity;these can be effectively changed by normalizing, which will change the strength and plasticity matching of non-quenched-tempered steel and its morphology,and ex-pand its scope of application.It has been found that after normalizing between 850℃ to 1 150℃,the increase in nor-malizing temperature leads to the increase of the strength and decrease of the ductility and impact toughness,and the microstructure grain size increases also.When the normalizing temperature was above 1 050℃,steel microstructure coarsened obviously.Optimal normalizing temperature is 950℃ when the microstructure was refined and the strength and plasticity were both well.