1. ZHANG Ying-cai. Development of Automotive Pinion Steel and Its Application Technology [J]. Automible Technology, 2004 (10): 22 (in Chinese).
2. MA Li, WANG Mao-qiu, XU Xiang-qiu, et al. Austenite Grain Size and Hardenability of NbGB Microaloyed Gear Steels [J]. Transactions of Materials and Heat Treatment, 2009, 30(5): 74 (in Chinese).
3. Kubota Manabu, Ochi Tatsuro. Development of Anti-coarsening ExtraGfine Steel for Carburizing [J]. Nippon Steel Technical Report, 2003(88): 81 (in Japanese).
4. Alogab K A, Matlock D K, Speer J G, et al. The Influence of Niobium Microaloying on Austenite Grain Coarsening Behavior of TiModified SAE 8620 Steel [J]. ISIJ International, 2007, 47 (2): 307.
5. LIU Yan, WANG Mao-qiu, DONG Han, et al. Kinetics of Austenite Grain Coarsening in Nb-Bearing Gear Steels [J]. Journal of Iron and Steel Research, 2008, 20(11): 37 (in Chinese).