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本文研究了不同热处理工艺对Cr12钢显微组织的影响。试验表明,形变热处理—变温淬火—回火新工艺与锻后空冷—球化退火—淬火—回火常规工艺及锻后空冷—球化退火—等温淬火—回火工艺相比较,其显微组织中碳化物更为更细小、弥散、分布均匀、接近颗粒状;奥氏体晶粒细化;马氏体针和下贝氏体针细小;在强硬的马氏体基体上分布有塑性与韧性较好的少量下贝氏体和适量、细小、均匀分布的残留奥氏体。在硬度、耐磨性与常规热处理的相同情况下,而冲击韧性a_K值及小能量多次冲击破断次数N显著提高。因此,采用新工艺处理的Cr12钢制冲裁模具使用寿命远远超过常规工艺处理的该类模具使用寿命,并已接近世界同类模具的先进水平。
This paper studies the different heat treatment process on the microstructure of Cr12 steel. The experimental results show that compared with the conventional process of forging air-cooling-spheroidizing-quenching-tempering after forging heat-quenching-tempering-forging, air cooling-spheroidizing-isothermal quenching-tempering, the microstructure In the carbide is more small, dispersed, evenly distributed, close to granular; austenite grain refinement; martensitic needle and bainite needle is small; in a tough martensite matrix distribution of plasticity and toughness A small amount of lower bainite and moderate, fine, uniform distribution of retained austenite. In the same case of hardness, wear resistance and conventional heat treatment, the value of a_K of impact toughness and the number of multiple-impact-break N of small energy increase significantly. Therefore, the use of new technology processing Cr12 steel blanking die life is much longer than the conventional processing of such mold life, and has approached the world’s advanced level of similar molds.