|
|
|
| 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.
|
|
Received: 15 July 2013
Published: 28 March 2014
|
|
|
|
| [1] |
CAO Yan-guang, LI Zhao-dong, DING Can-can, ZHANG Jin-wen, YONG Qi-long, GAO Jian-bing. Effect of niobium addition on hardenability of high-speed railway axle steel[J]. Iron and Steel, 2020, 55(6): 107-112. |
| [2] |
ZHOU Ren-yuan, ZHU Li-hui, LI Shi-xian, ZHAI Guo-li. Improvement of reheat-cracking susceptibility and microstructure of T23 steel[J]. Iron and Steel, 2020, 55(3): 80-86. |
| [3] |
HUI Ya-jun, WU Ke-min, XU Ke-hao, XIAO Bao-liang, LINGHU Ke-zhi, LIU Kun. Development of 500 MPa grade high ductility square tube steel and its work hardening behavior[J]. Iron and Steel, 2020, 55(2): 131-138. |
| [4] |
ZHONG Bin1,2,CHEN Yi-qing1,2,GAO Peng1,2,LV Jia-shun2,LI Lin1,2,SAN Hong-yu1,2. Effects of microstructure and hydrogen trap on hydrogen diffusion coefficient of sulfurresistant tube[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(1): 81-87. |
| [5] |
GAO Xiangming1，PEI Mingde1，2，LI Guoping1，2. Influence of cold rolling on precipitation of S32750 super duplex stainless steel[J]. Iron and Steel, 2019, 54(9): 94-98. |
| [6] |
LIU Xiang，DU Qunli，LI Xin. Effect of heating process on grain growth of#br#
NbTi microalloyed steel[J]. Iron and Steel, 2019, 54(9): 116-120. |
|
|
|
|
2014, Vol. 49 
