Experimental characterization of dynamic deformation behaviour for SCM440 steel at high strain rates

Lee, Keunho; Lee, Yerim; Woo, Sanghyun; Lee, Changsoo; Park, Leeju

doi:10.1051/epjconf/201818302019

Cited by 3 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In defense and civilian applications, extreme operating conditions such as supersonic impact, penetration, and explosion accompany the dynamic mechanical behavior of materials. These can cause severe plastic deformation involving considerable increases in temperature due to the adiabatic heating conditions at high strain rates [1]. The shaped charge, known as a high explosive anti-tank weapon system, could be a good representative for describing the extremely deformed condition and is based on the Munroe-Neumann effect, which makes the explosive energy focus specifically on the hollow cavity [2].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Tensile Extrusion Behavior of Fine-Grained Copper Fabricated by Powder Injection Molding

Lee

Woo²,

Park

2022

Crystals

Self Cite

View full text Add to dashboard Cite

The dynamic tensile extrusion (DTE) behavior and microstructural evolution of fine-grained (FG, ~1 μm < d < ~10 μm) Cu fabricated by powder injection molding (PIM) were investigated. The FGM Cu was fabricated by PIM with commercial micro-sized Cu powder sintering at 850 °C for 2 h, while the FGH Cu was developed by the hot isostatic pressing (HIP) of the FGM at 780 °C for 2 h under a pressure of 1000 bar. In order to compare the DTE behavior of the FG Cu manufactured using different methods, the ultrafine-grained-B (UFG, d < ~1 μm) Cu was developed by performing 16 passes of equal-channel angular pressing with route Bc, and the FG-150 Cu was fabricated by annealing the UFG-B Cu bar at 150 °C for 1 h. The DTE tests were performed with identical flyer velocities using an all-vacuum gas gun. The fragments and remnants were carefully recovered after the DTE tests and examined by electron backscattered diffraction measurement and a micro-Vickers hardness test. A strong dual <001> + <111> texture was developed during the DTE for both FGM and FGH Cu. In contrast to the outcome of the UFG-B and FG-150, little evidence of dynamic recrystallization taking place during the DTE in the FGM and FGH was found during analysis of the grain morphology and grain orientation spread. Premature failure based on void coalescence was induced at the vertex region of the FGM fragments due to pre-existing pores. The HIP treatment on the FGM Cu increased the relative density by reducing the pre-existing pores and, as a result, increased the DTE ductility of the FGH Cu.

show abstract

Section: Introductionmentioning

confidence: 99%

Dynamic Tensile Extrusion Behavior of Fine-Grained Copper Fabricated by Powder Injection Molding

Lee

Woo²,

Park

2022

Crystals

Self Cite

View full text Add to dashboard Cite

show abstract

Insights into deformation-induced heating: Temperature-strain prediction in SCM440 steel under deformation scenarios

Lap-Arparat,

Tuchinda

2024

Heliyon

View full text Add to dashboard Cite

Mechanical Properties of White Metal on SCM440 Alloy Steel by Laser Cladding Treatment

et al. 2021

View full text Add to dashboard Cite

The bearing is a machine element that plays an important role in rotating the shaft of a machine while supporting its weight and load. Numerous bearings have been developed to improve durability and life, depending on the functions and operating conditions in which they are desired. White metal is one of method to improve durability that is soft and bonded to the inner surface of the bearing to protect the bearing shaft. Currently, the centrifugal casting process is used as a white metal lamination method, but it involves problems such as long processing times, high defect rates and harmful health effects. In this paper, a laser cladding treatment is applied to bond powdered white metal to SCM440 alloy steel, which is used as bearing material in terms of replacing the risks of a centrifugal process. In order to understand whether laser cladding is a suitable process, this paper compares the mechanical properties of white metal produced on SCM440 alloy steel by centrifugal casting and the laser cladding process. The laser power, powder feed rate and laser head speed factors are varied to understand the mechanical properties and measure the hardness using micro Vickers and conduct field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and friction testing to understand the mechanical properties and surface characteristics. Based on the results, the hardness values of the cladding (white metal) layer ranged between 24 and 26 HV in both the centrifugal casting and laser cladding methods. However, the hardness of the white metal produced by laser cladding at about a depth of 0.1 mm rose rapidly in the cladding process, forming a heat-affected zone (HAZ) with an average hardness value of 200 HV at a laser power of 1.1 kW, 325 HV at 1.3 kW and 430 HV at 1.5 kW. The surface friction testing results revealed no significant differences in the friction coefficient between the centrifugal casting and laser cladding methods, which allows the assumption that the processing method does not significantly influence the friction coefficient.

show abstract

Experimental characterization of dynamic deformation behaviour for SCM440 steel at high strain rates

Cited by 3 publications

References 8 publications

Dynamic Tensile Extrusion Behavior of Fine-Grained Copper Fabricated by Powder Injection Molding

Dynamic Tensile Extrusion Behavior of Fine-Grained Copper Fabricated by Powder Injection Molding

Insights into deformation-induced heating: Temperature-strain prediction in SCM440 steel under deformation scenarios

Mechanical Properties of White Metal on SCM440 Alloy Steel by Laser Cladding Treatment

Contact Info

Product

Resources

About