Comparative Investigations on Measurement Technologies of Metal Surface Residual Stress

2012 ◽  
Vol 468-471 ◽  
pp. 409-413
Author(s):  
Fu Jin Yu ◽  
Lin Lin Wang
Keyword(s):  
Residual Stress ◽  
Cast Iron ◽  
Stress Measurement ◽  
Spheroidal Graphite ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron ◽  
Measurement Results ◽  
Iron Material

In this paper, the surface residual stress of spheroidal graphite cast iron was measured by using critically refracted longitudinal (LCR) ultrasonic wave, X-ray diffraction (XRD) and blind-hole measurement methods. The test specimens used in this study were cut from a practical forging roller made from spheroidal graphite cast iron. The measurement results were compared and analyzed. They indicated that the measurement results obtained by this LCR method were consistent with those of the other two methods, which verified that for spheroidal graphite cast iron material, LCR method was an applicable, effective and reliable test technology of surface residual stress measurement.

Effect of Heat Treatmemt in (α+γ) Range on Mechanical Properties of Austempered Spheroidal Graphite Cast Iron

2018 ◽  
Vol 941 ◽  
pp. 558-561
Author(s):  
Tatsuo Inoue ◽  
Shiro Torizuka
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
Retained Austenite ◽  
Isothermal Treatment ◽  
Spheroidal Graphite ◽  
X Ray Diffraction ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron ◽  
Before And After

It is well known that austempered spheroidal graphite cast iron shows good tensile and elongation. And, retained austenite include in the austempered spheroidal graphite cast iron structure was known to effect for the mechanical properties when TRIP was occurred. On the other hand, fineness and homogeneity of the structure are considered to influence as a factor to improve mechanical property. In this study, the mechanical properties of spherical graphite cast iron was evaluated that it treatmented fineness prior-structure and austenitized at (α + γ) range followed by isothermal treatment at bainitic transformation temperature range. Compared the heat treatment of this study and typical austempering treatment, the mechanical properties with good balance of strength and ductility were obtained in the heat treatment of this study. But, retained austenite that it determined by x-ray diffraction was slightly changed before and after the tensile test. Therfore, it was considered that not TRIP but complex phase effect on mechanical properties.

scholarly journals The influence of vibratory shot peening on the selected properties of the surface layer elements made of cast iron

Mechanik ◽  
2019 ◽  
Vol 92 (11) ◽  
pp. 739-741
Author(s):  
Kazimierz Zaleski ◽  
Agnieszka Skoczylas
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Surface Layer ◽  
Cast Iron ◽  
Shot Peening ◽  
Experimental Investigations ◽  
Spheroidal Graphite ◽  
Absolute Value ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron

The results of experimental investigations influence of vibratory shot peening on surface roughness and residual stress of spheroidal graphite cast iron objects were presented. The surfaces before vibratory shot peening were milled using different feed. After vibratory shot peening surface roughness Ra = 0.7÷0.9 μm was obtained and in surface layer compressive residual stress, with the maximum (absolute) value from 170 MPa to 330 MPa at a depth 0.4÷0.7 mm have been formed. For accepted vibratory shot peening condition it was recommended to use time of about 8 minutes.

Color Etching for Characterization the Grain Orientation in Spheroidal Graphite Cast Iron

2007 ◽  
Vol 537-538 ◽  
pp. 389-396 ◽  
Author(s):  
Ibolya Kardos ◽  
Zoltán Gácsi ◽  
Péter János Szabó
Keyword(s):  
Cast Iron ◽  
Crystallographic Orientation ◽  
Grain Orientation ◽  
Test Material ◽  
Spheroidal Graphite ◽  
Metallic Materials ◽  
Additional Information ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron ◽  
Back Scattering

Color etching is a widely used technique for visualizing different phases in metallic materials. Its advantage to the traditional etching techniques is that it gives additional information within one phase, namely, the color shade of a given phase can change in a certain range. This paper demonstrates that, due to the physics of the color etching, the shade of a phase also depends on the crystallographic orientation of the investigated grain. As a test material, spheroidal graphite cast iron was used, and individual grain orientation was identified by automated electron back scattering diffraction (EBSD). Results showed that there is a strong correlation between grain orientation and the shades obtained by color etching.

Progress of erosive wear in spheroidal graphite cast iron

Wear ◽  
1996 ◽  
Vol 198 (1-2) ◽  
pp. 150-155 ◽  
Author(s):  
K. Shimizu ◽  
T. Noguchi ◽  
T. Kamada ◽  
H. Takasaki
Keyword(s):  
Cast Iron ◽  
Erosive Wear ◽  
Spheroidal Graphite ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron

scholarly journals Copper Enrichment around Graphite in Cu-added High-Strength Spheroidal Graphite Cast Iron

Materia Japan ◽  
2009 ◽  
Vol 48 (12) ◽  
pp. 624-624 ◽  
Author(s):  
Yasuhide Ishiguro ◽  
Kenji Ichino ◽  
Hideto Takasugi
Keyword(s):  
Cast Iron ◽  
High Strength ◽  
Spheroidal Graphite ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron

Semisolid Forging of Cast Iron Using Rapid Resistance Heating

2007 ◽  
Vol 561-565 ◽  
pp. 925-928 ◽  
Author(s):  
Seijiro Maki ◽  
Kazuhito Suzuki ◽  
Kenichiro Mori
Keyword(s):  
Cast Iron ◽  
Control Function ◽  
Electric Energy ◽  
Spheroidal Graphite ◽  
Pig Iron ◽  
Resistance Heating ◽  
Cast Irons ◽  
Ac Power ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron

Feasibility of semisolid forging of cast iron using rapid resistance heating was experimentally investigated. Gray pig iron FC250 and spheroidal graphite cast iron FCD600, whose carbon equivalents are both 4.3% in mass, were used for the experiments. Since these cast irons have a narrow semisolid temperature range, an AC power supply with an input electric energy control function was used. In this study, the resistance heating characteristics of the cast irons were firstly examined, and then their semisolid forging experiments were conducted. In the forging experiments, the conditions of the forgings such as microstructures and hardness properties were examined, and the feasibility of the semisolid forging of cast iron using resistance heating was discussed. As a result, it was found that the method presented here is highly feasible.

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