Effect of Two-Cycle Heat Treatment on Mechanical Properties of Ductile Iron

2013 ◽  
Vol 393 ◽  
pp. 79-82
Author(s):  
B. Abdullah ◽  
Mohd Faizul Idham ◽  
A. Jaffar ◽  
Ahmad Faiz Zubair ◽  
M. Mohamed
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Ductile Iron ◽  
Treatment Process ◽  
Treatment Processes ◽  
Hardness Tests ◽  
Heat Treated ◽  
Different Temperatures ◽  
Two Stages ◽  
Holding Temperature

The aim of this study is to investigate the mechanical properties of ductile iron after treatment with two-cycle heat treatment processes which modified from austempering. The modified heat treatments have two stages holding temperature. Ductile iron was austenitized at 900 °C for an hour and followed by transferring the sample to other furnace which was set at different temperatures of i) 250 °C; ii) 300 °C; iii) 350 °C without quenching for 1.5 hours. Tensile (ASTM E8M), impact (ASTM-E23-1990) and Rockwell hardness tests were carried out to study the mechanical properties of the ductile iron. It was found that the sample which was heat treated using two-cycle heat treatment process at temperature of 250 °C contributed to better absorbing impact energy properties and hardness properties. Meanwhile, sample that heat treated at 350 °C has higher tensile strength.

scholarly journals The Effect of Heat Treatment on the Mechanical Properties of SAE 1035 Steel

2016 ◽  
Vol 8 ◽  
pp. 32-43
Author(s):  
Osita Obiukwu ◽  
Henry Udeani ◽  
Progress Ubani
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fatigue Strength ◽  
Carbon Steel ◽  
Endurance Limit ◽  
Tensile Tests ◽  
Treatment Processes ◽  
Treatment Conditions ◽  
Hardness Tests ◽  
Heat Treated

The effect of various heat treatment operations (annealing, normalizing, tempering) on mechanical properties of 0.35% carbon steel was investigated. The change in the value of endurance limit of the material as a result of the various heat-treatment operations were studied thoroughly. It was found that the specimens tempered at low temperature (200°C) exhibited the best fatigue strength. Microscope was used to characterize the structural properties resulting from different heat treatment processes. The results from the tensile tests impact tests and hardness tests showed that the mechanical properties variate at every heat-treatment conditions. The microstructure of differently heat-treated steels was also studied.

Microstructure and XRD of Ductile Iron Using Annealing-Tempering Heat Treatment Process

2013 ◽  
Vol 393 ◽  
pp. 83-87
Author(s):  
Mohd Faizul Idham ◽  
B. Abdullah ◽  
Junaidi Syarif ◽  
Ahmed Jaffar ◽  
Siti Khadijah Alias ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Ductile Iron ◽  
Xrd Analysis ◽  
Graphite Nodule ◽  
Tempering Temperature ◽  
Treatment Processes ◽  
Heat Treated ◽  
Different Temperatures ◽  
Metallographic Observation ◽  
Graphite Structure

In this present study, the effect of tempering temperature of annealing-tempering combination processes, on microstructure as well as exploring the phase constituents of ductile iron through XRD analysis were performed. Ductile iron produced through conventional CO2sand casting method was performed annealing-tempering heat treatment processes by using change furnace method. Three different temperatures were investigated ranging from (i) 250 °C, (ii) 300 °C and (iii) 350 °C for 1.5 hours respectively. Standard metallographic observation and XRD analysis were done to characterize the microstructure and the constituents respectively. It is found that the graphite structure exist in both treated and untreated samples. Pearlitic structure was formed in the microstructure for heat treated samples. Ferritic-pearlitic matrix structure surrounding the graphite nodule has been shown in as-cast sample. Annealing-tempering process does not change the BCC ferrite peak in (200), (211), (220) and (310) planes shown in as-cast.

Microstructure and Properties of Heat-Treated 440C Martensitic Stainless Steel

2013 ◽  
Vol 334-335 ◽  
pp. 105-110 ◽  
Author(s):  
Siti Hawa Mohamed Salleh ◽  
Mohd Nazree Derman ◽  
Mohd Zaidi Omar ◽  
Junaidi Syarif ◽  
S. Abdullah
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Ferrite Matrix ◽  
Rapid Quenching ◽  
Heat Treated Sample ◽  
Treatment Processes ◽  
Heat Treated ◽  
Treated Sample

440C martensitic stainless steels are widely used because of their good mechanical properties. The mechanical properties of 440C martensitic stainless steel were evaluated after heat treatment of these materials at various types of heat treatment processes. The initial part of this investigation focused on the microstructures of these 440C steels. Microstructure evaluations from the as-received to the as-tempered condition were described. In the as-received condition, the formations of ferrite matrix and carbide particles were observed in this steel. In contrast, the precipitation of M7C3carbides and martensitic structures were present in this steel due to the rapid quenching process from the high temperature condition. After precipitation heat treatment, the Cr-rich M23C6carbides were identified within the structures. Moreover, a 30 minutes heat-treated sample shows the highest value of hardness compared to the others holding time. Finally, the tempering process had been carried out to complete the whole heat treatment process in addition to construct the secondary hardening phenomenon. It is believed that this phenomenon influenced the value of hardness of the 440C steel.

Research on Hot-Work Die Steel Used for Extrusion Wheel

2012 ◽  
Vol 482-484 ◽  
pp. 1611-1617
Author(s):  
Sheng Feng Wang ◽  
Hong Yu Liu ◽  
Peng Zhou
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Thermal Fatigue ◽  
Treatment Process ◽  
Fatigue Tests ◽  
Heat Treatment Process ◽  
Die Steel ◽  
Die Steels ◽  
Treatment Processes ◽  
Hot Work Die

A set of new nitrogen-containing hot work die steels were designed. The best experimental steels and their heat treatment processes were optimized by microstructures, mechanical properties and thermal fatigue tests. The results show that the best compositions of V, Cr, N are 1.0 wt％, 3.75 wt％ and 0.01 wt％, respectively. The optimized heat treatment process is that quenching at 1080°C, first tempering at 550°C and second tempering at 530°C.

Characterization and Optimized Ageing Parameters of Aluminium Alloy AA6110

2014 ◽  
Vol 931-932 ◽  
pp. 312-316 ◽  
Author(s):  
Adisorn Kodwichian ◽  
Patiphan Juijerm
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Aluminium Alloy ◽  
Ageing Time ◽  
Precipitation Sequence ◽  
Automotive Manufacturing ◽  
Treatment Processes ◽  
Transmission Electron ◽  
Heat Treated ◽  
Different Temperatures

Copper containing aluminium alloy AA6110 is introduced to automotive industries for the last few decades. An understanding of its precipitation sequence and mechanical properties during ageing treatment is valuable to optimize some heat treatment processes in the automotive manufacturing. Therefore, in this study, the precipitation sequence, microstructures and mechanical properties of copper containing aluminium alloy AA611 were investigated. A differential scanning calorimeter (DSC) with regular heating rate of 10 °C/min was performed on the solid solution heat treated aluminium alloy AA6110 for the precipitation sequence investigation. Solid solution heat treated samples were aged at different temperatures and times. Hardness values of differently aged aluminium alloy AA6110 were measured to determine optimized parameters of the ageing process. It was found that the maximum hardness value of 141 HV was detected at an ageing temperature of 160 °C for about 12 hr. Tensile properties and microstructures using transmission electron microscope (TEM) of specimens aged at a temperature of 160 °C with different ageing time will be investigated and shown.

scholarly journals Studies of the Properties and Microstructure of Heat Treated 0.27% C and 0.84% Mn Steel

2018 ◽  
Vol 8 (5) ◽  
pp. 3484-3487
Author(s):  
M. I. Mohamed
Keyword(s):  
Heat Treatment ◽  
Cooling Water ◽  
Rolled Steel ◽  
Treatment Processes ◽  
Treated Steel ◽  
Heat Treated ◽  
Structural Applications ◽  
Different Temperatures ◽  
Mn Steel ◽  
Heat Treated Steel

In the present work, different heat treatments like hardening with different cooling rates followed by tempering at different temperatures have been performed. The material used in this study is carbon steel of 0.27% C and 0.84% Mn. Samples of as-rolled steel were subjected to different heat treatment processes. The steel was heated to the austenitizing temperature of 870°C for 2hrs followed by water quenching, oil quenching, air and furnace cooling. Water and oil quenched samples were subjected to tempering for one hour at temperatures of 250°C, 350°C, 450°C and 550°C. Tensile and impact tests were carried out for as rolled and heat-treated steel. Results show that the heat treated steel revealed an excellent combination of tensile strength and impact strength, which is suitable for structural applications. Optical metallographic investigation was carried out for all samples compared with the as rolled steel. The heat treatment revealed remarkable changes in steel morphology and mechanical properties.

scholarly journals ADI after Austenitising from Intercritical Temperature

2013 ◽  
Vol 13 (1) ◽  
pp. 81-88
Author(s):  
A. Kowalskia ◽  
S. Kluska-Nawarecka ◽  
K. Regulski
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fuzzy Logic ◽  
Cast Iron ◽  
Chemical Composition ◽  
Ductile Iron ◽  
Logic Model ◽  
Plastic Properties ◽  
The Matrix ◽  
Different Temperatures

Abstract ADI subjected to austenitising at intercritical temperatures contains in its matrix the precipitates of pre-eutectoid ferrite. Studies were carried out on the ductile iron of the following chemical composition: C = 3,80%, Si = 2,30%, Mn = 0,28%, P = 0,060%, S = 0,010%, Mg = 0,065%, Ni = 0,60%, Cu = 0,70%, Mo = 0,21% This cast iron was austenitised at three different temperatures, i.e. 800, 815 and 830oC and austempered at 360 and 380oC. For each variant of the cast iron heat treatment, the mechanical properties, i.e. YS, TS, EL and Hardness, were measured, and structure of the matrix was examined. Higher plastic properties were obtained owing to the presence of certain amount of pre-eutectoid ferrite. The properties were visualised using fuzzy logic model in a MATLAB. software.

scholarly journals Effect of Heat Treatment on Microstructure and Mechanical Properties of a Selective Laser Melting Processed Ni-Based Superalloy GTD222

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3668
Author(s):  
Tian Xia ◽  
Rui Wang ◽  
Zhongnan Bi ◽  
Guoliang Zhu ◽  
Qingbiao Tan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Laser Melting ◽  
Microstructure Characteristics ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated

Additive manufacturing (AM) of nickel-based superalloys is of high interest for application in complex hot end parts. However, it has been widely suggested that the microstructure-properties of the additive manufacturing processed superalloys are not yet fully clear. In this study, the GTD222, an important superalloy for high-temperature hot-end part, were prepared using selective laser melting and then subjected to heat treatment. The microstructure evolution of the GTD222 was investigated and the mechanical properties of heat treated GTD222 were tested. The results have shown that the grain size of the heat treated GTD222 was close to its as-built counterparts. Meanwhile, a large amount of γ’ and nano-scaled carbides were precipitated in the heat treated GTD222. The microstructure characteristics implied that the higher strength of the heat treated GTD222 can be attributed to the γ’ and nano-scaled carbides. This study provides essential microstructure and mechanical properties information for optimizing the heat treatment process of the AM processed GTD222.

scholarly journals An Investigation into Mechanical Properties of Ductile Cast Iron with Different Heat Treatment Processes

2019 ◽  
Vol 63 (3) ◽  
pp. 183-187
Author(s):  
Romany R. Moussa ◽  
Amer E. Ali ◽  
Ragab K. Abdel-Magied ◽  
Mohamed N. Elshiekh
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
Wear Rate ◽  
Experimental Tests ◽  
Mechanical Tests ◽  
Heat Treatments ◽  
Ductile Cast Iron ◽  
Treatment Processes ◽  
Heat Treated

The mechanical properties as well as microstructure of the ductile cast iron (DCI) are most likely affected by heat treatments. In this work, the mechanical properties of different heat treated of DCI alloy were investigated. Two heat treatment (HT) processes were conducted for DCI; austempering and quenching followed by lower tempering. The melted alloy of DCI was poured in Y-block, from which the specimens of the mechanical tests were prepared. Experimental tests were carried out to investigate the effect of these HT processes on the mechanical properties. A comparison between mechanical properties due to HT and as cast DCI are presented and discussed. The results showed that there is a difference in microstructure, homogeneity, wear rate and compression of DCI based on the conducted heat treatment.

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