Dislocation density and grain size evolution in hard machining of H13 steel: numerical and experimental investigation

Li, Binxun; Zhang, Song; Hu, Rong; Zhang, Xinzhi

doi:10.1016/j.jmrt.2020.02.051

Cited by 20 publications

(8 citation statements)

References 37 publications

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“…In the case of the As15-6 composite, its increased wear resistance could be attributed to its high dispersity and the presence During the wear process of a cutting tool, pits appeared in the rake surface and chamfers in the flank. It was found that the wear process of the As16-5 ceramic could be described in general terms of cutting tool wear [28] and from the perspective of the dislocation-based model [29]. After grinding with diamonds, the grains of the oxide, nitride, and carbide phases in ceramics showed a certain dislocation density.…”

Section: Resultsmentioning

confidence: 99%

Effect of SiC Addition to Al2O3 Ceramics Used in Cutting Tools

et al. 2020

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In this study, the effect of the addition of silicon carbide to alumina ceramics commonly used in cutting tool applications is addressed. Performance of Al2O3–SiC composite cutting inserts during the machining of hardened steels and ductile iron was compared to the results obtained for a cutting tool made out of 99 wt.% Al2O3, Al2O3–TiC, Al2O3–TiC–ZrO2, and Al2O3–TiN. In almost all tests, the composite with silicon carbide demonstrated better wear resistance, longer tool lifetime, and the ability to cut at higher speeds. The enhanced properties of cutting tools with SiC can be attributed to the morphology and dimensions of the inclusions in the matrix as well as to the strength of the interphase boundaries, small porosity, and lack of high inner stresses in the volume.

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Section: Resultsmentioning

confidence: 99%

Effect of SiC Addition to Al2O3 Ceramics Used in Cutting Tools

et al. 2020

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“…As can be seen from Figure 4c, the cross-section of the M + HT workpiece near the machined surface was composed of recrystallized grains, which showed a gradient structure. After the as-received GH4169 was machined, the dislocation density on the subsurface was in a gradient distribution, namely, the dislocation density gradually decreased from the machined surface to the matrix [27]. As a result, the driving force of recrystallization on the machined surface was larger than that on the subsurface during the heat treatment.…”

Section: Relationship Between Microstructure and Work Hardeningmentioning

confidence: 99%

Effects of Sequential Operation with Heat Treatment and Mechanical Milling on Work Hardening for Superalloy GH4169

Zhu

Liu

Ren

et al. 2021

Metals

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Engineering components are usually manufactured with sequential production processes. Work hardening due to previous production processes affects the machinability of the workpiece in subsequent operations. In this research, the surface work hardening of a workpiece manufactured by two sequential processes with heat treatment/milling (HT + M) and milling/heat treatment (M + HT) of superalloy GH4169 was investigated. First, the surface microstructure characteristics, including plastic deformation and grain size of the machined workpiece surface processed by the two sequential processes, were quantitatively presented. Then, the microhardness on the machined workpiece surface and its cross-section was measured and analyzed. Finally, a surface microhardness calculation model considering twin boundary deformation was proposed. Here, we also present the microstructure evolution principle of the machined workpiece surface by the two sequential processes. It was found that the degree of work hardening of HT + M machining was 179%, whereas that of M + HT was only 101%. The research results can be applied to the optimized selection of process sequence for manufacturing superalloy GH4169.

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“…As is known, hard machining has been widely used in the machine finishing of hardened steels [1][2][3]. With the development of high-performance cutting tools, a more stable hard cutting process and higher machining efficiency can be obtained [4,5].…”

Section: Introductionmentioning

confidence: 99%

Surface Integrity and Corrosion Resistance of 42CrMo4 High-Strength Steel Strengthened by Hard Turning

Liu

et al. 2021

Materials

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To improve the surface corrosion resistance of 42CrMo4 high-strength steel used in a marine environment, this article studied the effects of hard turning on the surface integrity and corrosion resistance of 42CrMo4 high-strength steel through the single factor experimental method, namely hard turning, polarization corrosion, electrochemical impedance spectroscopy, potentiodynamic polarization curve, and salt spray tests. The results indicated that the surface integrity was modified by the hard turning, with a surface roughness lower than Ra 0.8 μm, decreased surface microhardness, fine and uniform surface microstructure, and dominant surface residual compressive stress. The hard turning process was feasible to strengthen the surface corrosion resistance of 42CrMo4 high-strength steel. The better corrosion resistance of the surface layer than that of the substrate material can be ascribed to the uniform carbides and compact microstructure. The corrosion resistance varied with cutting speeds as a result of the changed surface microhardness and residual compressive stress, varied with feed rates as a result of the changed surface roughness, and varied with cutting depths as a result of the changed surface residual compressive stress, respectively. The surface integrity with smaller surface roughness and microhardness and bigger surface residual compressive stress was beneficial for corrosion resistance.

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Dislocation density and grain size evolution in hard machining of H13 steel: numerical and experimental investigation

Cited by 20 publications

References 37 publications

Effect of SiC Addition to Al2O3 Ceramics Used in Cutting Tools

Effect of SiC Addition to Al2O3 Ceramics Used in Cutting Tools

Effects of Sequential Operation with Heat Treatment and Mechanical Milling on Work Hardening for Superalloy GH4169

Surface Integrity and Corrosion Resistance of 42CrMo4 High-Strength Steel Strengthened by Hard Turning

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