scholarly journals Evaluation of the Mechanical Properties of Gray Cast Iron Using Electrical Resistivity Measurement

2016 ◽  
Vol 16 (4) ◽  
pp. 29-32 ◽  
Author(s):  
M. Bieroński ◽  
O. Krasa ◽  
M. Koza ◽  
D. Ksiąźek ◽  
R. Kuś
Keyword(s):  
Tensile Strength ◽  
Electrical Resistivity ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
Electrical Resistivity Measurement ◽  
Regression Equations ◽  
Power Functions ◽  
The Relationship

Abstract In this paper an attempt to determine the relationship between the electrical resistivity and the tensile strength and hardness of cast iron of carbon equivalent in the range from 3.93% to 4.48%. Tests were performed on the gray cast iron for 12 different melts with different chemical composition. From one melt poured 6 samples. Based on the study of mechanical and electro-resistive determined variation characteristics of tensile strength, hardness and resistivity as a function of the carbon equivalent. Then, regression equations were developed as power functions describing the relationship between the resistivity of castings and their tensile strength and hardness. It was found a high level of regression equations to measuring points, particularly with regard to the relationship Rm=f(ρ). The obtained preliminary results indicate the possibility of application of the method of the resistance to rapid diagnostic casts on the production line, when we are dealing with repeatable production, in this case non variable geometry of the product for which it has been determinated before a regression equation.

scholarly journals Effects of Inoculation on the Pearlitic Gray Cast Iron with High Thermal Conductivity and Tensile Strength

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1876 ◽  
Author(s):  
Guiquan Wang ◽  
Xiang Chen ◽  
Yanxiang Li ◽  
Zhongli Liu
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
High Thermal Conductivity ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
Metallographic Analysis ◽  
Structure And Properties ◽  
Nucleation Sites

With the aim of improving the thermal conductivity and tensile strength of pearlitic gray cast iron, the influence of inoculation on structure and properties was experimentally investigated. Three group of irons with similar compositions were inoculated by Zr-FeSi, Sr-FeSi, and SiC inoculants, respectively. The metallographic analysis was used to measure the maximum graphite length, primary dendrites amount and eutectic colonies counts. For a certain carbon equivalent, it was confirmed that the thermal conductivity of pearlitic gray cast iron has a direct correlation with the maximum graphite length while the tensile strength was influenced mainly by the primary dendrites amount. The optimal structure and highest thermal conductivity and tensile strength were obtained by Sr-FeSi inoculant. MnS particles act a pivotal part in modifying the structure of gray cast iron. It was found that providing nucleation sites both for graphite and primary austenite is important to promote the thermal conductivity and strength. However, excessive nuclei (MnS particles) results in shorter graphite flakes and thus the depressive growth of primary dendrites.

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).

ISO 185/JL/350

Alloy Digest ◽  
2021 ◽  
Vol 70 (9) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
High Strength ◽  
Heat Treating ◽  
Gray Cast ◽  
Spheroidal Graphite ◽  
Cast Irons ◽  
Test Pieces

Abstract ISO 185/JL/350 is a higher-tensile-strength gray cast iron that has a pearlitic matrix, and a tensile strength of 350–450 MPa (51–65 ksi), when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter test bars. It provides a combination of high strength while still maintaining good thermal conductivity compared with other types of cast iron. This grade approaches the maximum tensile strength attainable in gray cast iron. Applications therefore tend to be confined to those where thermal conductivity requirements in service preclude the use of one of the other higher-strength materials such as spheroidal graphite cast irons, which have inferior thermal properties. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on wear resistance as well as casting and heat treating. Filing Code: CI-85. Producer or source: International Organization for Standardization.

Effect of Rolling Process on Microstructure and Wear Properties of High Carbon Equivalent Gray Cast Iron

2021 ◽  
Vol 36 (6) ◽  
pp. 903-910
Author(s):  
Yihong Zhao ◽  
Qianyu Chen ◽  
Zhiwei Zheng ◽  
Pei Cao ◽  
Ziyu Gong ◽  
...  
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Rolling Process ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
High Carbon ◽  
Wear Properties

MEEHANITE GC275

Alloy Digest ◽  
2021 ◽  
Vol 70 (2) ◽  
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Physical Properties ◽  
Tensile Properties ◽  
Gray Cast Iron ◽  
Heat Treating ◽  
Gray Cast ◽  
Strength Grade ◽  
Test Pieces

Abstract Meehanite GC275 is a pearlitic gray cast iron that has a minimum tensile strength of 275 MPa (40 ksi) when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter, test bars. This intermediate-tensile-strength grade has a fine, close-grained structure that is ideal for finishing cuts. It is used for a wide variety of applications on account of its useful combination of good all round properties with adaptability to production of small and large volumes. This datasheet provides information on physical properties, hardness, and tensile properties as well as fatigue. It also includes information on heat treating, machining, and joining. Filing Code: CI-78. Producer or source: Meehanite Metal Corporation.

ISO 185/JL/275

Alloy Digest ◽  
2021 ◽  
Vol 70 (3) ◽  
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Heat Treating ◽  
Gray Cast ◽  
Damping Capacity ◽  
Wear Properties ◽  
Lower Strength ◽  
Test Pieces ◽  
Lower Carbon

Abstract ISO 185/JL/275 is an intermediate-tensile-strength gray cast iron that has a pearlitic matrix and a tensile strength of 275–375 MPa (40–54 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/275 contains lower carbon and silicon contents, while still maintaining good thermal conductivity and damping capacity. Owing to its higher tensile strength and hardness, it exhibits superior wear properties. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as fatigue. It also includes information on casting and heat treating. Filing Code: CI-79. Producer or source: International Organization for Standardization.

Influence of Primary Austenite Dendrite on the Microstructure and Mechanical Properties of Gray Cast Iron

2013 ◽  
Vol 750-752 ◽  
pp. 450-453
Author(s):  
Jun Tao Zhang ◽  
Feng Zhang Ren
Keyword(s):  
Cast Iron ◽  
Room Temperature ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Primary Austenite ◽  
Complex Process ◽  
Cr Addition ◽  
The Relationship ◽  
Microstructure And Mechanical Property ◽  
Annealing Method

The formation of the microstructure of gray cast iron is a complex process. There remains many unanswered questions about the process. Using annealing method, the first crystallized primary austenite dendrites from the molten iron was displayed. The room temperature microstructures of gray cast iron with and without Cu, Cr addition were studied. The relationship between microstructure and mechanical property was discussed. The results show that the amount of primary austenite dendrites of the multi-alloyed gray cast iron increases significantly and the secondary dendrite arm spacing seems narrow. The microstructure at room temperature is fine and homogeneous. Tensile strength increases significantly, up to 300MPa with adding 0.58%Cu and 0.29%Cr.

Study on the Influences on Microstructure and Properties of High-Strength Grey Cast Iron in Addition to Alloying Elements Nb

2013 ◽  
Vol 800 ◽  
pp. 221-224
Author(s):  
Jun Tao Zhang ◽  
Feng Zhang Ren
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Mechanical Performance ◽  
High Strength ◽  
Optical Microscope ◽  
Gray Cast ◽  
Dynamic Strain ◽  
Cast Irons ◽  
Grey Cast ◽  
The Relationship

The increase of the strength of gray cast iron is mainly depended on alloying. However, with the improvement of strength, its processing performance will always decrease. So three different gray cast irons are studied in this experiment, including adding 0.1% Nb elements, adding 0.2% Nb elements and adding 0.3% Nb elements, to investigate the Nbs effect to the mechanical performance of gray cast iron, we adopt Dynamic Strain Amplifier to measure cutting force to evaluate processing performance, use Optical Microscope and Electron Microscopy observe each samples organization, explains the relationship between Nbs content and the mechanical and processing performance of gray cast iron from micro-level. Finally, we draw the conclusion: when the Nb comes to 0.3 percent, the appearance of E-type graphite and Nb carbide durum granular will greatly decrease its processing performance.

Influence of Alloying on the Uniformity of Strength and Structure of Gray Iron

2012 ◽  
Vol 490-495 ◽  
pp. 3348-3352
Author(s):  
Li Li Xiao ◽  
Feng Zhang Ren ◽  
Meng Qi Liu ◽  
Yu Fei Wang ◽  
Na Wen Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Cutting Force ◽  
Gray Cast Iron ◽  
Brinell Hardness ◽  
Pure Copper ◽  
Gray Iron ◽  
Gray Cast ◽  
Micro Hardness ◽  
Cast Irons

Two gray cast irons with equal tensile strength were prepared to investigate the influence of alloying on the machinability of gray iron. After 75SiFe modifying treatment, they were alloyed by the mixture additive containing RE, Cr, Mn, Si and Fe with a certain proportion and pure copper, respectively. The hardness, section sensitivity, structuralhomogenity and machinability were tested in this experiment. The results show that both of the gray irons have the same brinell hardness and the micro-hardness. The section sensitivity of the gray iron alloyed by the mixture additive is smaller than the gray iron alloyed by copper. The main cutting force of the cast iron alloyed by the mixture additive is lower than that of the cast iron alloyed by copper, therefore, the gray cast iron alloyed by the mixture additive has a better machinability than the cast iron alloyed by copper.

The Mechanical Properties of Gray Cast Iron and Metallographic Structure Effect on the Chip Shape

2011 ◽  
Vol 339 ◽  
pp. 200-203 ◽  
Author(s):  
Xiao Bin Huang ◽  
Yu Gang Ye ◽  
Xing Quan Shen ◽  
Xing Chang
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Chemical Composition ◽  
Gray Cast Iron ◽  
Chip Thickness ◽  
Gray Cast ◽  
Chip Shape ◽  
On Chip ◽  
Relationship Of ◽  
The Relationship

The cutting tests were carried out on HT200, HT250 and HT300 cast iron. The effects of the strength, hardness, microstructure, chemical composition of cast iron on chip shape were studied. The results show the relationship of different strength, chip thickness and chip deformation of gray cast iron, in the similar cutting conditions.

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