Adding 1%Mo to Enhance Strength-toughness Combination of 18Cr2Ni2 Steel for Needle Valve Bodies
LI Yanzheng, YUN Xiaoxue, LAI Chengban, HE Changlin, MIN Yongan
State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200444
Abstract: Higher combination of strength and toughness of carburizing steels has been demanded for needle valve bodies in new generation diesel engines.Based on 18Cr2Ni2, a typical steel for needle valve bodies, 18Cr2Ni2Mo steel was promoted by additional alloying of 1wt% Mo. Mechanical properties of these two steels in quenching and tempering state were determined. Their microstructures were respectively examined by OP, FESEM, TEM and XRD. The spatial distribution of alloying elements was systematically investigated by atom probe tomography (APT). The results show that 1wt% Mo alloying leads to stronger strengthening via greater solid solution, finer grains and higher dislocation density. Moreover, it is proposed that Mo inhibits the formation of micro-twin martensite during quenching and increases the toughness of 18Cr2Ni2Mo steel. Therefore, the product of strength and ductility of the new type steel is significantly improved from 11.73 GPa% to 18.18 GPa%, and the impact absorption energy is increased from 46.3 J to 71.0 J.
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2021, Vol. 35 
