A Novel Duplex Treatment of C20 Steel Combining Low-Pressure Carburizing and Laser Quenching

Sola, Ramona; Veronesi, Paolo; Giovanardi, Roberto; Parigi, G.

doi:10.1007/s11665-017-2965-3

Cited by 9 publications

(5 citation statements)

References 24 publications

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“…It can be clearly seen that K890-II increases Indentation Hardness (HI), total hardening work (Wt) and plastic work (Wp), in comparison to K890-I (by about 15%, 4% and 10% respectively). As reported in [43,54], the higher the Wt and Wp values, the greater the ductility and toughness of the material. The results of nanoindentation confirm the increase of strength and ductility induced by the K890-II, already highlighted by the tensile tests.…”

Section: Nanoindentationsupporting

confidence: 52%

“…During the test, the nanoindenter continuously recorded the penetration depth and the load. More details on the nanoindentation test are discussed in [43,44] where it is explained how it is possible to calculate Indentation Hardness HI (GPa) plastic deformation work Wp (pJ) and total deformation work Wt (pJ). High Wt values mean high energy dissipated by the material during loading which is related to high toughness.…”

Section: Mechanical Testsmentioning

confidence: 99%

“…It allows the Indentation Hardness (HI), Total hardening Work (Wt) and plastic Work (Wp) to be evaluated by analysing the load-penetration depth curve. HI-similar to the other micro or macro hardnesses-provides information on the material strength; Wt expresses the ability of materials to dissipate deformation energy during loading and, for this reason, is a useful tool to evaluate ductility and toughness, as reported in [43,[54][55][56].…”

Section: Nanoindentationmentioning

confidence: 99%

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Effect of Different Heat Treatments on Tensile Properties and Unnotched and Notched Fatigue Strength of Cold Work Tool Steel Produced by Powder Metallurgy

Morri

Ceschini

Messieri³

2022

Metals

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The present study investigates the effect of two heat treatments on the microstructure, the tensile and the fatigue properties of a powder metallurgy tool steel that has undergone two heat treatments: quenching and multiple tempering (conventional for powder metallurgy tool steel), and quenching and multiple tempering with an intermediate cryogenic step at −80 °C (new solution). The findings of the research indicated that the new heat treatment promotes the development of a homogeneous distribution of carbides in the martensitic matrix, with an increase of about 10% in tensile strength and about 7% in elongation to failure. This combination of exceptional strength with a high degree of toughness leads to an improvement in the fatigue behaviour of the steel, which exhibits a higher unnotched and notched fatigue strength (about 15% and 25% respectively) and a lower fatigue notch factor (about 15%) compared to conventionally heat-treated steel. These results highlight that the powder metallurgy tool steel, with the new heat treatment, could be a viable option for the production not only of tools and dies, but also for high-performance automotive components, including even those with complex geometries, such as camshafts or crankshafts.

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Section: Nanoindentationsupporting

confidence: 52%

Section: Mechanical Testsmentioning

confidence: 99%

Section: Nanoindentationmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Different Heat Treatments on Tensile Properties and Unnotched and Notched Fatigue Strength of Cold Work Tool Steel Produced by Powder Metallurgy

Morri

Ceschini

Messieri³

2022

Metals

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“…[ 26 ] Three repetitions on each sample allowed obtaining statistically representative values from such a heterogeneous material. More details on the nanoindentation test are discussed in previous works, [ 27–30 ] where the authors explain how it is possible to calculate the indentation hardness (HI, GPa) and indentation elastic modulus ( E IT, GPa). A representative optical image of the indentation and corresponding load–displacement curves are reported in Figure 2 .…”

Section: Methodsmentioning

confidence: 99%

Influence of Interlayer Forced Air Cooling on Microstructure and Mechanical Properties of Wire Arc Additively Manufactured 304L Austenitic Stainless Steel

Tonelli

Sola

Laghi

et al. 2021

steel research int.

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Wire‐and‐arc additive manufacturing (WAAM) is an innovative technology that involves deposition of subsequent layers of molten materials. Due to the high deposition rates, this technology is suitable for the production of large‐scale complex structures. Further enhancement in the productivity can be achieved by an interlayer cooling strategy that reduces idle time between depositions. However, the effect of the interlayer cooling on microstructure and mechanical properties has to be addressed. In this view, the present work compares microstructural features and mechanical properties of WAAM‐produced plates of austenitic AISI 304 L, focusing on the effect of both active interlayer air cooling and possible anisotropy induced by the additive process. Microstructural and mechanical characterization was conducted on samples extracted along the longitudinal, transverse, and diagonal directions to the deposition layers of WAAM plates, processed with and without interlayer active cooling. Results showed no remarkable influence of cooling conditions on the microstructure and mechanical properties of WAAM plates, which are indeed affected by the anisotropy induced by the additive process. The observed anisotropy in the elastic modulus, independent from different cooling conditions, was related to the crystallographic texture consequent to the highly oriented microstructure typically induced by the process.

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“…Panfil et al [85] performed laser heat treatment on gasnitrided 42CrMo4 steel to improve the mechanical properties and found a significant increase in surface hardness (about 11.87 GPa). Similarly, Sola et al [258] proposed a double step surface treatment combining low pressure gas carburizing and laser quenching to improve the surface hardness, hardening depth thickness and mechanical properties of C20 steel.…”

Section: Carbon Nanotubes As Surface Coatingmentioning

confidence: 99%

Laser surface hardening of bearing steels

Maharjan¹

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dai and all other friends in Singapore and back home for being there for me both at good as well as hard times. In addition, I would also like to acknowledge NTU and Advanced Remanufacturing and Technology Center (ARTC) for supporting my PhD work and A*STAR SINGA for providing me the scholarship. Last but not least, I express my heartfelt thanks to my parents, sister and family for their ceaseless blessing, love and support.

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A Novel Duplex Treatment of C20 Steel Combining Low-Pressure Carburizing and Laser Quenching

Cited by 9 publications

References 24 publications

Effect of Different Heat Treatments on Tensile Properties and Unnotched and Notched Fatigue Strength of Cold Work Tool Steel Produced by Powder Metallurgy

Effect of Different Heat Treatments on Tensile Properties and Unnotched and Notched Fatigue Strength of Cold Work Tool Steel Produced by Powder Metallurgy

Influence of Interlayer Forced Air Cooling on Microstructure and Mechanical Properties of Wire Arc Additively Manufactured 304L Austenitic Stainless Steel

Laser surface hardening of bearing steels

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