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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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+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

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+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

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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)
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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

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+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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