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Journal of Engineering Materials and Technology | Volume 132 | Issue 2 | Research Paper
Research Papers

50CrMo4 Steel-Determination of Mechanical Properties at Lowered and Elevated Temperatures, Creep Behavior, and Fracture Toughness Calculation

[+] Author and Article Information
J. Brnic

Department of Engineering Mechanics, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatiabrnic@riteh.hr

M. Canadija

Department of Engineering Mechanics, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatiamarkoc@riteh.hr

G. Turkalj

Department of Engineering Mechanics, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatiaturkalj@riteh.hr

D. Lanc

Department of Engineering Mechanics, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatiadlanc@riteh.hr

J. Eng. Mater. Technol 132(2), 021004 (Feb 16, 2010) (6 pages) doi:10.1115/1.4000669 History: Received February 03, 2009; Revised October 29, 2009; Published February 16, 2010; Online February 16, 2010
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In this paper, some interesting, experimentally determined actualities referring to the 50CrMo4 steel are presented. That way, the mechanical properties of the material are derived from uniaxial tensile tests at lowered and elevated temperatures. Engineering stress versus strain diagrams for both mentioned temperatures, curves representing the effect of temperature on specimen elongation, and short-time creep curves are given. Notch impact energy test was also carried out. Taking into consideration the service life of the final product of the mentioned steel widely used in engine and machine technology, all of the mentioned data may be relevant during design and manufacturing procedure.
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Copyright © 2010 by American Society of Mechanical Engineers
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References

1
Rozvany, G. I. N., 1989, "Structural Design via Optimality Criteria", Kluwer Academic, Dordrecht.
2
Collins, J. A., 1993, "Failure of Materials in Mechanical Design", Wiley, New York.
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Raghavan, V., 2004, "Materials Science and Engineering", Prentice-Hall of India, New Delhi.
4
Findley, W. N., Lai, J. S., and Onaran, K., 1989, "Creep and Relaxation of Nonlinear Viscoelastic Materials", Dover, New York.
5
Boresi, A. P., and Schmidt, R. J., 2003, "Advance Mechanics of Materials", Wiley, New York.
6
Timmins, P. F., 1997, “Failure Control in Process Operations, ASM Handbook,” "Fatigue and Fracture", ASM International, Materials Park, OH, Vol. 19 , p. 468.
7
Diot, S., Gavrus, A., Guines, D., and Ragneau, E., 2003, “Identification du Comportement d’un Acier en Compression: du Quasi-Statique au Dynamique: Identification of a Steel Compression Behaviour: From Quasi Static Approach to Dynamic One,” Mécanique & Industries, 4 (5), pp. 519–524.  [CrossRef]
8
Ost, W., De Baets, P., and Van Wittenberghe, J., 2009, “Failure Investigation and Redesign of Piston-and Pump Shafts,” Eng. Fail. Anal.,16 (4), pp. 1174–1187.  [CrossRef]
9
Tsay, L. W., and Lin, Z. W., 1998, “Effect of Laser Beam Radiation on Fatigue Crack Propagation in AISI 4150 Steel,” Fatigue Fract. Eng. Mater. Struct., 21 (12), pp. 1549–1558.  [CrossRef]
10
Badisch, E., and Kirchgaßner, M., 2008, “Influence of Welding Parameters on Microstructure and Wear Behavior of a Typical NiCrBSi Hardfacing Alloy Reinforced With Tungsten Carbide,” Surf. Coat. Technol., 202 , pp. 6016–6022.  [CrossRef]
11
Brnić, J., Turkalj, G., Čanađija, M., and Lanc, D., 2009, “Creep Behavior of High-Strength Low-Alloy Steel at Elevated Temperatures,” Mater. Sci. Eng., A, 499 , pp. 23–27.  [CrossRef]
12
Turkalj, G., Lanc, D., and Brnić, J., 2009, “Large Displacement Analysis of Elastic-Plastic Framed Structures Under Creep Regimes,” Int. J. Struct. Stab. Dyn., 9 (1), pp. 61–83.  [CrossRef]
13
Pepelnjak, T., and Barisic, B., 2009, “Computer-Assisted Engineering Determination of the Formability Limit for Thin Sheet Metals by a Modified Marcinic Method,” J. Strain Analysis, 44 , pp. 459–472.  [CrossRef]
14
Papakonstantinou, C. G., and Katakalos, K., 2009, “Mechanical Behavior of High Temperature Hybrid Carbon Fiber/Titanium Laminates,” ASME J. Eng. Mater. Technol., 131 , p. 021008.  [CrossRef]
15
ISO, 2000, International Standard ISO 15579:2000, Metalic Materials—Tensile Testing at Low Temperature.
16
2005, Annual Book of ASTM Standards: Metal Test Methods and Analytical Procedures. Vol. 03.01, ASTM International, Baltimore.
17
Courtney, T. H., 1997, “Fundamental Structure—Property Relationships in Engineering Materials, ASM Handbook,” "Materials and Design", ASM International, Materials Park, OH, Vol. 20 , p. 336.
18
Shekhter, A., Kim, S., Carr, D. G., Crocker, A. B. L., Ringer, S. P., 2002, “Assesment of Temper Embrittlement in an Ex-Service 1Cr-1Mo-0.25V Power Generating Rotor by Charpy V-Notch Testing, KIc Fracture Toughness and Small Punch Test,” Int. J. Pressure Vessels Piping, 79 (8–10), pp. 611–615.  [CrossRef]
19
Roberts, R., and Newton, C., 1981, “Interpretive Report on Small Scale Test Correlations With KIc Data,” Welding Research Council Bulletins, pp. 1–18.

Figures

Grahic Jump Location
+Creep curve stages—classical representation
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Creep curve stages—classical representation
Figure 1

Creep curve stages—classical representation

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+Lowered temperatures system
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Lowered temperatures system
Figure 2

Lowered temperatures system

Grahic Jump Location
+Elevated temperatures system
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Elevated temperatures system
Figure 3

Elevated temperatures system

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+Charpy pendulum impact machine
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Charpy pendulum impact machine
Figure 4

Charpy pendulum impact machine

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+Stress–strain behavior of 50CrMo4 steel at lowered temperatures
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Stress–strain behavior of 50CrMo4 steel at lowered temperatures
Figure 5

Stress–strain behavior of 50CrMo4 steel at lowered temperatures

Grahic Jump Location
+The effect of lowered temperature on mechanical properties σm and σ0.2 versus temperature (σm-ultimate tensile strength and σ0.2−0.2 percent offset yield strength)
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The effect of lowered temperature on mechanical properties σm and σ0.2 versus temperature (σm-ultimate tensile strength and σ0.2−0.2 percent offset yield strength)
Figure 6

The effect of lowered temperature on mechanical properties σm and σ0.2 versus temperature (σm-ultimate tensile strength and σ0.2−0.2 percent offset yield strength)

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+Stress-strain behavior of 50CrMo4 steel at elevated temperatures
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Stress-strain behavior of 50CrMo4 steel at elevated temperatures
Figure 7

Stress-strain behavior of 50CrMo4 steel at elevated temperatures

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+The effect of elevated temperature on mechanical properties, elongation and reduction in area: (a) mechanical properties σm and σ0.2 versus temperature and (b) specimen’s elongation and reduction in area versus temperature
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The effect of elevated temperature on mechanical properties, elongation and reduction in area: (a) mechanical properties σm and σ0.2 versus temperature and (b) specimen’s elongation and reduction in area versus temperature
Figure 8

The effect of elevated temperature on mechanical properties, elongation and reduction in area: (a) mechanical properties σm and σ0.2 versus temperature and (b) specimen’s elongation and reduction in area versus temperature

Grahic Jump Location
+Creep behavior of 50CrMo4 steel at T=400°C
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Creep behavior of 50CrMo4 steel at T=400°C
Figure 9

Creep behavior of 50CrMo4 steel at T=400°C

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+Creep behavior of 50CrMo4 steel at T=500°C
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Creep behavior of 50CrMo4 steel at T=500°C
Figure 10

Creep behavior of 50CrMo4 steel at T=500°C

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+Creep behavior of 50CrMo4 steel at T=600°C
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Creep behavior of 50CrMo4 steel at T=600°C
Figure 11

Creep behavior of 50CrMo4 steel at T=600°C

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+Rheological model
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Rheological model
Figure 12

Rheological model

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+Measured and Burger’s model creep curves for 50CrMo4 steel at T=400°C.
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Measured and Burger’s model creep curves for 50CrMo4 steel at T=400°C.
Figure 13

Measured and Burger’s model creep curves for 50CrMo4 steel at T=400°C.

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