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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850~1 150℃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。1 050℃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。
Non-quenched and tempered steel forgings, due to the characteristics of steel and the instability of the production process, often result in parts performance deviation, and can be effectively changed by normalizing the toughness of non-quenched and tempered steel match the toughness and morphology, to expand its scope. The results show that the strength of non-quenched and tempered steel 48MnV steel increases with the increase of normalizing temperature after normalizing at 850-1-1500 ℃, the plasticity and toughness decrease, and the grain size of the microstructure increases. When the temperature is above 050 ℃, the microstructure of steel is coarsened obviously. Using 950 ℃ normalizing, 48MnV non-quenched and tempered steel can get the best toughness match and fine uniform microstructure.