Precipitation Hardening of Titanium Carbides in Ti Micro-Alloyed Ultra-High Strength Steel

Xiang Dong Huo; Sheng Xia Lv; Xin Ping Mao; Qi Lin Chen

doi:10.4028/www.scientific.net/AMR.284-286.1275

Paper Titles

Study on the Influence of Inclusion and Void on Fatigue Life of Bearing Steel Using Statistics of Extreme Values
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Three Dimensional Simulations on Stress Distribution and Fatigue Damage Life of Wheel/Rail Contact Region
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Adaptive Neural Network Modelling in Fatigue life Prediction under Load History effects
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Effect of M/A Constituents on Mechanical Properties of High Grade Pipeline Steel
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Precipitation Hardening of Titanium Carbides in Ti Micro-Alloyed Ultra-High Strength Steel
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Study on Sulfur Existing Form in Sinter
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Experimental Study on Tundish Flux System for High Al-Containing TRIP Steel’s Slab Casting
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Study on Smelting High-Al Cold Heading Steel SWRCH6A Using Single-Slag Process
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Effects of Modification on Stress Field of the Inclusions in Large Rudder Arm Steel Casting
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Precipitation Hardening of Titanium Carbides in Ti Micro-Alloyed Ultra-High Strength Steel

Abstract:

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.