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Mechanical Properties Analysis of 4340 Steel Specimen Heat Treated in Oven and Quenching in Three Different Fluids

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Abstract

This paper proposes a statistical approach to analyze the mechanical properties of a standard test specimen, of cylindrical geometry and in steel 4340, with a diameter of 6 mm, heat-treated and quenched in three different fluids. Samples were evaluated in standard tensile test to access their characteristic quantities: hardness, modulus of elasticity, yield strength, tensile strength and ultimate deformation. The proposed approach is gradually being built (a) by a presentation of the experimental device, (b) a presentation of the experimental plan and the results of the mechanical tests, (c) anova analysis of variance and a representation of the output responses using the RSM response surface method, and (d) an analysis of the results and discussion. The feasibility and effectiveness of the proposed approach leads to a precise and reliable model capable of predicting the variation of mechanical properties, depending on the tempering temperature, the tempering time and the cooling capacity of the quenching medium.

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Abbreviations

Ac3 :

Heating temperature at point A3 (°C)

T :

Oven temperature (°C)

ORT:

Oven residence time (min)

HTC:

Heat transfer coefficient (W m−2 K−1)

RaD :

Rayleigh number

Nu:

Nusselt number

Pr:

Prandtl number

k :

Thermal conductivity of the material (W m−1 K−1)

T s :

Surface temperature of the material (°C)

T ∞ :

Ambient air temperature (°C)

D :

Diameter of the specimen (mm)

ϑ :

Kinematic viscosity (m2 s−1)

α :

Thermal diffusivity (m2 s−1)

g :

Gravitational acceleration (m s−2)

T f :

Average temperature between Ts and T∞ (°C)

Bi:

Biot number

h :

Thermal transfer coefficient (W m−2 K−1)

C p :

Specific heat (J kg−1 K−1)

ρ :

Density (kg m−3)

S :

Surface of the sample (m2)

V :

Volume of the sample (m3)

S y :

Offset yield strength (MPa)

S u :

Ultimate tensile strength (MPa)

E r :

Elongation at break (mm mm−1)

\({\mathcal{H}}\) :

Hardness, HRC (Rockwell C)

P :

Prediction polynomial

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Authors and Affiliations

  1. Mathematics, Computer Science and Engineering Department, Université du Québec à Rimouski, Canada, 300, allée des Ursulines, Rimouski, QC, G5L 3A1, Canada

    Rachid Fakir, Noureddine Barka & Jean Brousseau

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  1. Rachid Fakir
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  2. Noureddine Barka
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  3. Jean Brousseau
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Correspondence to Rachid Fakir.

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Fakir, R., Barka, N. & Brousseau, J. Mechanical Properties Analysis of 4340 Steel Specimen Heat Treated in Oven and Quenching in Three Different Fluids. Met. Mater. Int. 24, 981–991 (2018). https://doi.org/10.1007/s12540-018-0120-9

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