Law of Uniaxial Tensile Tests of Ultra-high Strength 300M Steel Treated by Quenching-partitioning(Q-P) Process

MA Shao-hai; LI Yong; WANG Chun-xu; HUANG Shun-zhe; HAN Shun; LIU Xian-min

doi:10.11868/j.issn.1005-5053.2014.3.007

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Journal of Aeronautical Materials ›› 2014, Vol. 34 ›› Issue (3) : 42-47. DOI: 10.11868/j.issn.1005-5053.2014.3.007

Law of Uniaxial Tensile Tests of Ultra-high Strength 300M Steel Treated by Quenching-partitioning(Q-P) Process

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Abstract

The uniaxial tensile curves of 300M steel treated by Q-P process were measured. And the energy of the various tensile stages of 300M steel were analyzed. Influence of Q-P process on the properties and structures of 300M steel was studied by TEM,SEM and XRD. The results show that the strength of 300M steel treated by Q-P process decreases significantly apparently, and the elastic deformation energy Ee decreases, but the uniform plastic deformation energy Ep and the crack initiation energy Ee+Ep increase. The content of residual austenite can be raised to 15.62%, which exists between martensite lathes in film status and between prior austenite grain boundaries、lath packet boundaries in massive form. The phases of 300M steel treated by Q-P process consist of pre-formed lath martensite, fresh martensite, residual austenite and -carbide.Q-P process significantly improve crack initiation and propagation resistance of 300M steel, and extend the uniform plastic deformation stage of the material,and finally put off the necking creation.

Key words

Q-P process / 300M steel / ultra-high strength / martensite / residual austenite / crack initiation ene

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MA Shao-hai, LI Yong, WANG Chun-xu, HUANG Shun-zhe, HAN Shun, LIU Xian-min. Law of Uniaxial Tensile Tests of Ultra-high Strength 300M Steel Treated by Quenching-partitioning(Q-P) Process[J]. Journal of Aeronautical Materials, 2014, 34(3): 42-47 https://doi.org/10.11868/j.issn.1005-5053.2014.3.007

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