Study on Damping Capacities of Nodular Cast Iron Dense Bar Produced by Horizontal Continuous Casting

2011 ◽  
Vol 399-401 ◽  
pp. 250-253
Author(s):  
Zhong Ming Zhang ◽  
Jin Cheng Wang ◽  
Chun Jie Xu ◽  
Wei Ming Li ◽  
Gang Wang
Keyword(s):  
Cast Iron ◽  
Internal Friction ◽  
Continuous Casting ◽  
Nodular Cast Iron ◽  
Damping Capacity ◽  
Temperature Dependent ◽  
Horizontal Continuous Casting ◽  
Increasing Temperature ◽  
Snoek Relaxation ◽  
Superposition Effect

Damping capacities of the annealed nodular cast iron dense bar produced by horizontal continuous casting were measured by Dynamic Mechanical Analyzer. The relation of damping capacities with vibration amplitude, frequency and temperature was analyzed to investigate the damping mechanism of the alloy. The results show that the damping capacities increase with increasing temperature and frequency. The internal friction spectra exhibits two internal friction peaks at about 40°C and 150°C and caused by Snoek relaxation and Snoek-Köster relaxation, respectively. The maximum damping capacity can be obtained at about 63Hz. The damping is positive amplitude-dependent, whereas critical amplitude exists where the damping increases dramatically. The temperature-dependent damping results from the superposition effect of point-defect damping, grain boundary damping and interface damping, while dislocation damping is predominant in the frequency dependent damping. The amplitude dependent damping can be interpreted by G-L theory.

Machinability of rectangular bars of nodular cast iron produced by continuous casting

2018 ◽  
Vol 98 (9-12) ◽  
pp. 2505-2517 ◽  
Author(s):  
José A. G. de Sousa ◽  
Wisley Falco Sales ◽  
Wilson L. Guesser ◽  
Álisson R. Machado
Keyword(s):  
Cast Iron ◽  
Continuous Casting ◽  
Nodular Cast Iron

Graphite size and distribution of nodular cast iron obtained by continuous casting

2017 ◽  
Author(s):  
paulo victor marcondes ◽  
Paulo Soares ◽  
Ricardo Torres ◽  
Sergio Manenti
Keyword(s):  
Cast Iron ◽  
Continuous Casting ◽  
Nodular Cast Iron

Snoek Relaxation in bcc Metals and High Damping β-Ti Alloys

2009 ◽  
Vol 614 ◽  
pp. 175-180 ◽  
Author(s):  
Fu Xing Yin ◽  
Li Ming Yu ◽  
De Hai Ping ◽  
Satoshi Iwasaki
Keyword(s):  
Internal Friction ◽  
Temperature Stability ◽  
Relaxation Mechanism ◽  
Peak Height ◽  
Damping Capacity ◽  
Internal Friction Peak ◽  
Friction Mechanism ◽  
Bcc Metals ◽  
Temperature Position ◽  
Snoek Relaxation

The Snoek relaxation, a specific point-defect induced anelastic relaxation phenomenon, is characteristic of an internal friction peak in bcc metals with interstitial solutes. Such internal friction mechanism has not been applied in the development of high damping alloy while grain boundary and twin boundary featured anelastic relaxations are applied in some high damping alloys. In this paper, the fundamental principles and experimental results concerning the Snoek relaxation are reviewed, and the feasibility to apply the Snoek relaxation mechanism into high damping alloys is discussed. Due to the peak-shape behavior in the Snoek relaxation type damping, composition design of a high damping alloys should takes temperature position, broadness and also peak height into account. Ti-Nb-O and Ti-V-Cr-O alloys are designed and fabricated by CCLM casting in our laboratory. It is conformed that the damping behaviors of the alloys are of Snoek relaxation type showing obvious frequency and temperature dependence. While the broadened damping peak caused by the substitutional solutes is advantage to improve the temperature stability of damping capacity, a large concentration of interstitial solute and texture control are required to improve the reduced damping capacity.

Influence of Thermomechanical Treatment on the Damping Capacity of Selected Magnesium Alloys

2016 ◽  
Vol 879 ◽  
pp. 1992-1997
Author(s):  
Zuzanka Trojanová ◽  
Peter Palček ◽  
Mária Chalupová ◽  
Pavel Lukáč ◽  
Uwe Arlic
Keyword(s):  
Internal Friction ◽  
Magnesium Alloys ◽  
Significant Influence ◽  
Temperature Scale ◽  
Rolling Texture ◽  
Az31 Alloy ◽  
Dislocation Motion ◽  
Damping Capacity ◽  
Amplitude Dependence ◽  
Increasing Temperature

In the paper the temperature and amplitude dependence of internal friction in the AZ31, AZ63 and AZ91 alloys is reported. A rapid increase in internal friction with increasing temperature was estimated. Internal friction peaks were observed in AZ63 and AZ91 alloys. Position and height of the peaks in the temperature scale depends on the heating rate. Simultaneously, microstructural observations were performed in the selected points of the temperature scale. The amplitude dependence of internal friction in an AZ31 alloy, prepared by rolling, was measured. A significant influence of the rolling texture has been estimated. Main mechanisms of internal friction are connected with precipitation, dislocation motion and twinning.

CHARACTERISTIC INTERNAL FRICTION SPECTRUM OF GREY CAST IRON

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-929-C5-934 ◽  
Author(s):  
P. Millet ◽  
R. Schaller ◽  
W. Benoit
Keyword(s):  
Cast Iron ◽  
Internal Friction ◽  
Grey Cast Iron ◽  
Grey Cast ◽  
Internal Friction Spectrum

MEEHANITE GD

Alloy Digest ◽  
1964 ◽  
Vol 13 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Cast Iron ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Damping Capacity ◽  
Iron And Steel ◽  
Lubricating Properties

Abstract MEEHANITE-GD is a high strength iron casting having high damping capacity, self-lubricating properties, and good machinability. It combines the good properties of both cast iron and steel. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on casting, heat treating, machining, and joining. Filing Code: CI-32. Producer or source: Meehanite Metal Corporation.

MEEHANITE GA

Alloy Digest ◽  
1954 ◽  
Vol 3 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Cast Iron ◽  
Physical Properties ◽  
Machine Tools ◽  
High Strength ◽  
Heat Treating ◽  
Damping Capacity ◽  
Iron And Steel ◽  
Lubricating Properties

Abstract MEEHANITE GA is a high strength iron casting having high damping capacity, self-lubricating properties, and good machinability. It combines the good properties of both cast iron and steel. Applications include machine tools, gears, shafts, and housings. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on heat treating and machining. Filing Code: CI-5. Producer or source: Meehanite Metal Corporation.

ISO 185/JL/225

Alloy Digest ◽  
2020 ◽  
Vol 69 (9) ◽  
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Heat Treating ◽  
International Organization ◽  
Gray Cast ◽  
Damping Capacity ◽  
Lower Strength ◽  
Test Pieces ◽  
Lower Carbon

Abstract ISO 185/JL/225 is an intermediate-tensile-strength gray cast iron that has a predominantly pearlitic matrix, and a tensile strength of 225–325 MPa (33-47 ksi), when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter test bars. Compared with the lower strength gray cast iron grades, ISO 185/JL/225 contains lower carbon and silicon contents, while still maintaining excellent thermal conductivity, damping capacity, and machinability. This datasheet provides information on composition, physical properties, tensile properties, and compressive strength as well as fatigue. It also includes information on heat treating. Filing Code: CI-73. Producer or source: International Organization for Standardization (ISO).

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