Thermodynamic calculation method for precipitation of quaternary second-phase precipitates in ferrite steel
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A calculation method, ferritic steel technology, applied in the field of physical chemistry of metal materials, to achieve the effect of high stamping forming ability, strong ductility, high yield strength and tensile strength
Pending Publication Date: 2020-02-21
CHINA ELECTRIC POWER RES INST +1
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[0004] The thermodynamic precipitation calculation of the second phase particles in the hot-rolled nano-particle ferritic steel has theoretical guiding significance for the hot rolling and heat treatment process. The thermodynamic calculation method has not yet been reported in the process
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Embodiment 1
[0029] The invention discloses a thermodynamic calculation method for the precipitation of quaternary second phase precipitates in ferritic steel. Microalloying technology is adopted in iron and steel materials, and microalloying elements such as Nb, V, and Ti are added, which can play a role in microalloying. crystallization and precipitation strengthening.
[0030] In addition, the combination of microalloying elements with carbon and nitrogen can also fix carbon and nitrogen, which can weaken (or even eliminate) the harm of carbon and nitrogen solid solution strengthening to plasticity and toughness, and thermodynamic calculations have theoretical implications for the production of microalloys. Guiding significance.
[0031] For achieving the above object, technical scheme of the present invention is:
[0032] The thermodynamic precipitation behavior of C-N-Nb-V system hot-rolled TRIP steel in the austenite zone was calculated, and then the composite precipitated (M′ X M″...
Embodiment 2
[0045] Precipitation thermodynamic model establishment:
[0046] The present invention is based on (M') established by J.G.Speer X M″ 1-X )(C y N 1-y ) model for calculation, and for the compound calculation (M′ X M″ 1-X )(C y N 1-y ) can be linearly decomposed into m 1 (MˊC),m 2 (MˊN),m 3 (MˊˊC),m 4 (MˊˊN), where
[0047] m 1 +m 2 =x; (1)
[0048] m 3 +m 4 =1-x; (2)
[0049] m 1 +m 3 =y; (3)
[0050] m 2 +m 4 =1-y; (4)
[0051] Take the compound addition of Nb and V as an example, that is, the compound precipitates are (NbxV1-x)(CyN1-y), for different values of x and y, the solid state of (Nb,V)(C,N) in austenite The solubility product formula will also change. Using linear interpolation method, firstly, the solid solubility product formula of (Nb,V)(C,N) at different x and y values is obtained, and its general form can be expressed as the formula:
[0052] lg{[Nb] x [V] (1-x) [C] y [N] (1-y)}=2.96*m 1 +3.7*m 2 +6.72*m 3 +3.63*m 4 +m 1 *lo...
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Abstract
The invention relates to a thermodynamic calculation method for precipitation of quaternary second-phase precipitates in ferrite steel. According to the method, the thermodynamic precipitation behavior of the C-N-Nb-V series hot-rolled TRIP steel in an austenite region is calculated; then, linearly decomposing the (M 'XM' '1-X) (CyN1-y) which is compounded and separated out into m1 (M' C) by adopting linear decomposition; m2 (M 'N), m3 (M ''C), m4 (M ''N), calculating an NrT (maximum nucleation rate temperature) curve and a PTT (fastest precipitation nose point temperature) curve of (M 'XM' '1-X) (CyN1-y) precipitated in austenite; calculation results show that the calculation results are shown in the specification; the maximum nucleation rate temperatures of uniform nucleation, grain boundary nucleation and dislocation nucleation of the hot-rolled TRIP steel containing the components C (0.2)-N (0.015)-Nb (0.05)-V (0.1) are 792 DEG C, 862 DEG C and 782 DEG C respectively; when nucleation is carried out on a dislocation line (the nucleation rate is rapidly attenuated to zero); the nose point temperature is 834 DEG C, the thermodynamic precipitation calculation of second-phase particles in the hot-rolled nanoparticle ferrite steel has theoretical guiding significance for hot rolling and heat treatment processes, the hot-rolled nanoparticle ferrite steel can be used as a part of an automobile for absorbing collision energy, and the weight gain of an automobile body can be avoided while the safety is improved.
Description
technical field [0001] The invention relates to the technical field of physical chemistry of metal materials, in particular to a thermodynamic calculation method for the precipitation of quaternary second phase precipitates in ferritic steel. Background technique [0002] Microalloying technology is a new metallurgical discipline that appeared in the international metallurgical circle in the 1970s. "Microalloying" means that the content of elements added is quite small, usually less than 0.lwt%. These microalloying elements and carbon There is a high affinity between nitrogen and nitrogen, which causes the precipitation of the second phase in the matrix, thereby affecting the structure and properties of the steel. Nb has the strongest fine-grain strengthening effect, and V has the strongest precipitation strengthening effect. Usually Nb, V Composite addition can significantly improve the strength and toughness of steel. [0003] As a representative of advanced high-strength...
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