Strengthening Mechanism and Precipitation of Complex MC Particles in Ultra-High Strength Steel
LIU Shuang1,2，TANG Guang-bo2，LI Ji-guang1，LI Bin1,2，GAO Han-feng2,3
1.School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan 114000，Liaoning, China 2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China 3. College of Materials and Mineral Resources, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
Abstract：Precipitation time temperature curve of a novel ultra-high strength steel, with micro-alloy element of Nb, V, Ti and Mo was tested in austenite region by the stress relaxation method. The results show that the shape of precipitation-time-temperature(PTT) is a “C” curve and the quickest precipitation juncture is about 3.6 s at 940 ℃. Composition, quantity and particle size distribution of the precipitated phase in the hot rolled plate of test steel were investigated by chemical phase analysis and small-angle X-ray scattering method; morphology of the second phase particles in the hot rolled plate was also examined by TEM. The results show that M(C,N), ε-Fe3C compose the precipitated phase in the steel, MC phase particle mainly distributed below 10nm, and all are globose or subglobose; the refinement strengthening increment is about 207.95 MPa and the precipitation strengthening increment of MC phase is about 195.70 MPa.
收稿日期: 2013-07-15
出版日期: 2014-03-28
引用本文:
刘爽 唐广波 李激光 李斌 高韩锋 . 超高强度钢中复合MC型颗粒的沉淀析出及强化机制[J]. 钢铁, 2014, 49(3): 68-73.
LIU Shuang，TANG Guang-bo，LI Ji-guang，LI Bin，GAO Han-feng,. Strengthening Mechanism and Precipitation of Complex MC Particles in Ultra-High Strength Steel. Iron and Steel, 2014, 49(3): 68-73.
2014, Vol. 49 
