Comparison of the quenching capacities of hot salt and oil baths

Rassizadehghani, J.; Raygan, Shahram; Askari, Mohammad Hossein

doi:10.1007/s11041-006-0069-z

Cited by 13 publications

(4 citation statements)

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“…The hardness value of the annealed weldment sample was observed to be slightly lower than the HAZ region, this could be as a result of the grain growth of ferrite and pearlite grains in the weldment (plate 2a, b). However, the quenched weldment and HAZ samples exhibited the highest hardness values of about 108HRB and 56.2 HRB respectively; this could be as a result of the high cooling rates which led to the formation of hard and brittle marten site phase (plate 3a, b).This is in agreement with the report of Rassizadehghani et al, [9]. Figure 5 shows the impact strength (energy absorbed per unit area under the notch) for the PWHT structures produced by subjecting the welded samples to normalizing, annealing, hardening (quenching by water) treatments.…”

Section: Resultssupporting

confidence: 90%

Effect of Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of Arc Welded Medium Carbon Steel

2016

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Effect of post-weld heat treatment on the microstructure and mechanical properties of arc welded medium carbon steel was investigated. Medium carbon steel samples were butt-welded by using the shielded metal arc welding technique and, thereafter, heat treated by annealing, normalising and quench hardening in water. The microstructure of the as-welded and post-weld heated samples was characterised by means of optical microscopy while the hardness, toughness and tensile properties of the samples were determined by using Indentec universal hardness testing machine, Izod impact testing machine and Denison tensile testing machine respectively. The results of the optical microscopic test show that fine grains of pearlite in ferrite were obtained in normalized samples and martensite was also observed in quenched samples. On the other hand, mechanical property tests indicated that normalized welded specimens gave good combination of mechanical properties.

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Section: Resultssupporting

confidence: 90%

Effect of Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of Arc Welded Medium Carbon Steel

2016

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“…Thus, the mechanical strength of medium carbon steels can be improved by quenching in appropriate medium. However, the major influencing factors in the choice of the quenching medium are the kind of heat treatment, composition of the steel, the sizes and shapes of the parts [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Properties of Medium Carbon Steel Quenched in Water and Oil

Odusote¹,

Ajiboye²,

Rabiu³

2012

JMMCE

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Samples of medium carbon steel were examined after heating between 900˚C-980˚C and soaked for 45 minutes in a muffle furnace before quenching in palm oil and water separately. The mechanical behavior of the samples was investigated using universal tensile testing machine for tensile test and Vickers pyramid method for hardness testing. The microstructure of the quenched samples was studied using optical microscope. The tensile strength and hardness values of the quenched samples were relatively higher than those of the as-cast samples, suggesting improved mechanical properties. However, samples quenched in palm oil displayed better properties compared with that of water-quenched samples. This behavior was traced to the fact that the carbon particles in palm oil quenched samples were more uniform and evenly distributed, indicating the formation of more pearlite structure, than those quenched in water and the as-received samples.

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“…As the operating temperature of molten salt bath is in the range of 150-700 C [41], the prediction of total entropy generation of balls injected in molten salt for three temperature difference, namely, 70 K, 150 K and 250 K is shown in Figure 14.…”

Section: Effect Of Initial Temperature Difference and Injection Velocmentioning

confidence: 99%

Analysis of Entropy Generation during the Convective Quenching of a Cluster of Balls

Mahapatra

Manna

Ghosh

2014

Numerical Heat Transfer, Part A: Applications

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An entropy generation analysis is carried out for convective quenching of cluster of hot balls in a pool of three common quenchants (molten salt, water and oil). The formulation is based on the conservation principle in Eulerian framework following a two-fluid approach and clearly indicates the contribution due to thermal irreversibility as a result of finite temperature gradient and that due to viscous effect arising out of drag. The time averaged normalized entropy generation is used to find the most suitable injection velocity in the quenching process for molten salt. The quenching process is optimized by using the entropy generation parameter.

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Comparison of the quenching capacities of hot salt and oil baths

Cited by 13 publications

References 1 publication

Effect of Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of Arc Welded Medium Carbon Steel

Effect of Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of Arc Welded Medium Carbon Steel

Evaluation of Mechanical Properties of Medium Carbon Steel Quenched in Water and Oil

Analysis of Entropy Generation during the Convective Quenching of a Cluster of Balls

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