Precipitation Hardening of Titanium Carbides in Ti Micro-Alloyed Ultra-High Strength Steel
New 700MPa hot rolled ultra-high strength steels were successfully developed by using Ti micro-alloying technology in CSP line. Experimental methods, such as OM, TEM and chemical phase analysis, were used to study the experimental steel. The microstructure is composed of quasi-polygonal ferrite grains, whose average grain size is about 4μm. Large number of nanometer TiC particles distribute along dislocations. The mass fraction of MX phase is 0.0793wt%, in which the particles smaller than 10nm account for 33.7%. The contribution of precipitation hardening resulting from nanometer particles is calculated as approximate 158MPa.
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
X. D. Huo et al., "Precipitation Hardening of Titanium Carbides in Ti Micro-Alloyed Ultra-High Strength Steel", Advanced Materials Research, Vols. 284-286, pp. 1275-1278, 2011