Improved Mechanical Properties in Ti/Mo-Bearing Martensitic Steel by Precipitation and Grain Refinement

L. Xu; Jie Shi; Wen Quan Cao; Min Qing Wang; Wei Jun Hui; Han Dong

doi:10.4028/www.scientific.net/MSF.706-709.2378

Paper Titles

On the Methodology of Thermal Desorption Spectroscopy to Evaluate Hydrogen Embrittlement
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Fatigue Property of a 2.8GPa Grade Maraging Steel
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Effect of Electric Current Direction on Texture Evolution in a Cold Rolled Fe-3%Si Steel under Electric Current Pulses Treatment
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Effects of Magnetic Field Intensity on Carbon Diffusion in Pure Iron in the Single-Phase Austenite Region
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Improved Mechanical Properties in Ti/Mo-Bearing Martensitic Steel by Precipitation and Grain Refinement
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Low Temperature Precipitation in Nb-Added Si- and Si-Free Bainitic Steels
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Characterization of Precipitation Kinetics of Inconel 718 Superalloy by the Stress Relaxation Technique
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3D Imaging Using X-Ray Tomography and SEM Combined FIB to Study Non Isothermal Creep Damage of (111) Oriented Samples of γ / γ ' Nickel Base Single Crystal Superalloy MC2
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Modeling the Electrical Response of Waspaloy due to the Nucleation, Growth, and Coarsening of γ′
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Improved Mechanical Properties in Ti/Mo-Bearing Martensitic Steel by Precipitation and Grain Refinement

Abstract:

The yield strength and impact energy properties for martensitic steel fabricated by vacuum induction melting, is investigated. It is found that the addition of Ti can improve the yield strength property of the martensitic steel after reheat quenching process, which can be attributed to increase in precipitation hardening from formation of TiC precipitates in the martensitic matrix and a superfine sized (~8μm) grains in the martensitic structure. Moreover, the yield strength can be further enhanced by Mo addition, which can be ascribed to a large amount of freshly nano-sized (1-10nm) precipitates in the final martensitic structure. The experimental and theoretical results on the contribution of TiC precipitates to hardening of the martensitic steel are in excellent agreement. In addition, the impact toughness also has been improved along with yield strength followed by the heat treatment, which can be attributed to the grain refinement and high ratio of high-angle grain boundaries after Mo addition.