图书来源：二元合金相图及中间相晶体结构 二元合金相图及中间相晶体结构
作 者：唐仁政 田荣璋
出版时间：2009-05
定 价：320元
图书ISBN：978-7-81105-831-4
出版单位：中南大学出版社
Maoqiu Wang, Han Dong, and Qi WangDivision of Structural Materials, Central Iron & Steel Research Institute, Beijing 100081, China
摘 要：<正> The hardness, tensile strength and impact toughness of one quenched and tempered steel with nominal composition of Fe-0.25C-3.0Cr-3.0Mo-0.6Ni-0.1Nb （mass fraction） both at room temperature and at elevated temperatures were investigated in order to develop high-strength steel for long-life gun barrel use. It is found that the steel has lower decrease rate of tensile strength at elevated temperature in comparison with the commonly used G4335V high-strength gun steel, which contains higher Ni and lower Cr and Mo contents. The high elevated-temperature strength of the steel is attributed to the strong secondary hardening effect and high tempering softening resistance caused by the tempering precipitation of fine Mo-rich M2C carbides in the α-Fe matrix. The experimental steel is not susceptible to secondary hardening embrittlement, meanwhile, its room-temperature impact energy is much higher than the normal requirement of impact toughness for high strength gun steels. Therefore, the steel is suitable for pr
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