(1. College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China 2. Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China 3. State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei, China
Abstract:The effect of tempering temperature on the precipitates and mechanical properties of a Fe-Co-Ni-Cr-Mo-W 2 200 MPa secondary hardening ultra-high strength steel was studied by means of SEM, TEM, and physical chemical phase analysis. The results show that the steel had apparent phenomenon of secondary hardening during tempering. The tensile strength and yield strength reached peak at 490 and 530 ℃, and the peak strengths were respectively 2 243 and 1 859 MPa. The testing steel had good mechanical properties at 510 ℃. The tensile strength, the yield strength and the impact energy were respectively 2 185 MPa, 1 859 MPa and 35 J. When the temperature reached at 400-440 ℃, much more coarser cementite laminas were precipitated in and among martensitic laths. Because of the phenomenon of secondary hardening, when the temperature exceeded 470 ℃, the martensite lath precipitated a large number of uniformly distributed M2C carbides and a small amount of Laves phase -Fe2W. With the increasing of tempering temperature, the content of Mo and W elements increased, and the content of Fe and Cr decreased in type M2C carbide.
收稿日期: 2016-01-18
出版日期: 2016-07-26
引用本文:
吴 迪,厉 勇,王春旭 ,傅万堂,唐景林. 2 200 MPa级二次硬化型超高强度钢析出相及力学性能[J]. 钢铁, 2016, 51(8): 60-63.
WU Di ,,LI Yong ,WANG Chun-xu ,FU Wan-tang ,TANG Jing-lin . Precipitates and mechanical properties of 2 200 MPa secondary-hardening ulra-high strengh steel. Iron and Steel, 2016, 51(8): 60-63.
Ayer R, Machmeier P. On the characteristics of M2C carbides in the peak hardening regime of AerMet 100 steel[J]. Metallurgical and Materials Transactions A, 1998, 29(3): 903-905.
[3]
Ayer R, Machmeier P. On the characteristics of M2C carbides in the peak hardening regime of AerMet 100 steel[J]. Metallurgical and Materials Transactions A, 1998, 29(3): 903-905.