Research on Fabrication of TRIP Steel with High Durability



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Submitted Feb 10, 2019
Published Feb 22, 2019
10.24018/ejeng.2019.4.2.1141

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Many weapons and mechanical parts such as bullet shells, jet engine covers, bulletproof armor shells operated in harsh conditions require durability when used and good flexibility when forming. Many countries have used steel with phase transition effects due to plastic deformation - TRIP effect (Transformation Induced Plasticity) to replace low carbon steel, high-strength low-alloy steel fabricating them. The paper presents research on the technology of metallurgy of a CMnSiAl steel grade from sponge iron materials and application of mechanical-thermal technology to create small particles and organize three phases: Ferrite, Bainite, residual Austenite to stabilize and increase plasticity. The results show that the impurity content is low, S% is less than 0.025%; magnitude of small ferrite particles below 20?m, ratio of residual austenitic f? = 6.39%. Mechanical properties: durable limit ?b on 590 MPa, yield limit ?c over 390 MPa, ratio ?b/?c> 1.5 and relative elongation ?50 over 28%. Research results for the prospect of applying this steel grade in the manufacture of some defense products, instead imported materials.

Keywords: TRIP Steel High Durability CMnSiAl Steel.

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