Ma Zhijun's research while affiliated with Xi'an University of Technology and other places
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Publications (3)
The tension-tension fatigue test of the compacted graphite cast iron (CGI) alloy was carried out at 500℃ and 550℃, respectively. Because of the time-dependent deformation at elevated temperatures, the stress-strain curve presents hysteresis loops, and the area of the hysteresis loop increases gradually with continuous cyclic loading and sustained l...
The creep deformation and damage mechanism of compacted graphite cast iron (CGI) with varying pearlite contents were studied at 450 °C, 500 °C, and 550 °C, with accompanying stress ranges from 40 MPa to 150 MPa. The creep deformation of CGI alloys presents obvious when the temperature exceeds 450 °C. The creep rate exponentially decreases with pear...
The thermal conductivity of compacted graphite cast iron (CGI) after creep test (temperature ranging from 350 °C to 550 °C; stress ranging from 40 to 150 MPa) was measured at different testing temperatures (200 °C to 550 °C) in an argon atmosphere. The thermal conductivity increased slightly when the creep temperature increased from 350 °C to 500 °...
Citations
... To improve the heat transfer property of CGI, researchers have explored increasing vermicularity and ferrite proportions due to providing more pathways for heat transfer and increased thermal conductivity of the matrix [12,13] or reducing alloying additions due to the scattering of alloying atoms [14,15]. However, such structural changes often result in decreased tensile strength or microhardness, potentially weakening resistance to thermal fatigue and friction stability [16,17]. This contradictory relationship between the thermal and mechanical properties of CGI is also one of the reasons limiting the application of CGI brake discs. ...
... The high power density (HPD) diesel engine is one of the advanced engines in the future. Compared with the traditional diesel engine, the volume and weight of HPD are reduced by more than 50%, but the rotation speed of the crankshaft and explosion pressure increase by 100% and 200%, respectively [1][2][3]. As an essential hightemperature component, the cylinder head made of compacted graphite cast iron (CGI) alloys is usually experiencing 400°C-500°C and 20-30 MPa explosion pressure [4][5][6]. ...
