Deep Rolled Surface Improvement of the AISI 304L Using Cryogenic Cooling

2021 ◽  
pp. 243-251
Author(s):  
Khouloud Gharbi ◽  
Naoufel Ben Moussa ◽  
Nabil Ben Fredj
Keyword(s):  
Cryogenic Cooling ◽  
Aisi 304L ◽  
Rolled Surface ◽  
Surface Improvement

scholarly journals Improvement of the corrosion behavior of AISI 304L stainless steel by deep rolling treatment under cryogenic cooling

2021 ◽  
Author(s):  
Khouloud Gharbi ◽  
Naoufel Ben Moussa ◽  
Amir Ben Rhouma ◽  
Nabil Ben Fredj
Keyword(s):  
Surface Roughness ◽  
Corrosion Behavior ◽  
Electrochemical Behavior ◽  
Cryogenic Cooling ◽  
Localized Corrosion ◽  
304L Stainless Steel ◽  
Deep Rolling ◽  
Aisi 304L ◽  
Strain Induced Martensite ◽  
Chloride Environment

Abstract The effects of deep rolling parameters; particularly, work speed and cooling conditions (dry and cryogenic) on the surface integrity of AISI 304L machined samples and their further impact on uniform and localized corrosion behavior in chloride environment were experimentally investigated in this work. The electrochemical behavior of machined and deep rolled samples was assessed using cyclic potentiodynamic polarization tests in synthetic seawater. Findings of this study exhibit that grain refinement generated in the surface layers leads to improved corrosion behavior of deep rolled specimens with regard to machining state. In addition, machined samples deep rolled at a speed of 25 m/min, without cooling, showed better corrosion resistance than those processed under cryogenic cooling. However, the application of cryogenic deep rolling at speeds of 75 m/min and 120 m/min significantly enhanced the electrochemical behavior of mechanically treated specimens. It was found that the corrosion behavior of AISI 304L deep rolled components is related to combined factors (surface roughness, strain-induced martensite, microhardness, residual stress). Despite of high amounts of strain-induced martensite that can deteriorate the electrochemical behavior, it was shown that deep rolled specimens under cryogenic cooling with low surface roughness depict better uniform and localized corrosion resistances.

scholarly journals Energy assessment of different cooling technologies in Ti-6Al-4V milling

2021 ◽  
Vol 112 (11-12) ◽  
pp. 3279-3306
Author(s):  
Paolo Albertelli ◽  
Michele Monno
Keyword(s):  
Energy Performance ◽  
Primary Energy ◽  
Cryogenic Cooling ◽  
Model Parameters ◽  
Tribological Behaviour ◽  
Dry Cutting ◽  
Sustainable Solutions ◽  
Energy Assessment ◽  
Energy Models ◽  
Conventional Cooling

AbstractManufacturing craves for more sustainable solutions for machining heat-resistant alloys. In this paper, an assessment of different cooling lubrication approaches for Ti6Al4V milling was carried out. Cryogenic cutting (liquid nitrogen) and conventional cooling (oil-based fluid) were assessed with respect to dry cutting. To study the effects of the main relevant process parameters, proper energy models were developed, validated and then used for comparing the analysed cooling lubrication strategies. The model parameters were identified exploiting data from specifically conceived experiments. The power assessment was carried out considering different perspectives, with a bottom-up approach. Indeed, it was found that cryogenic cooling, thanks to a better tribological behaviour, is less energy demanding (at least 25%) than dry and conventional cutting. If the spindle power is considered, lower saving percentages can be expected. Cryogenic cooling showed its best energy performance (from 3 to 11 times) with respect to conventional cutting if the machine tool perspective is analysed. Considering even the primary energy required for producing the cutting fluids, the assessment showed that cryogenic cooling requires up to 19 times the energy required for conventional cutting.

scholarly journals Identification of LOFA Precursors in ITER Superconducting Magnet Cryogenic Cooling Circuit

2020 ◽  
pp. 107426
Author(s):  
V. Destino ◽  
R. Bonifetto ◽  
F. Di Maio ◽  
N. Pedroni ◽  
R. Zanino ◽  
...  
Keyword(s):  
Superconducting Magnet ◽  
Cryogenic Cooling ◽  
Cooling Circuit

scholarly journals Influence of Activated Fluxes on the Bead Shape of A-TIG Welds on Carbon and Low-Alloy Steels in Comparison with Stainless Steel AISI 304L

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 530
Author(s):  
Jerzy Niagaj
Keyword(s):  
Stainless Steel ◽  
Penetration Depth ◽  
High Strength ◽  
Tig Welding ◽  
Low Alloy Steels ◽  
Aisi 304L ◽  
A Tig Welding ◽  
Alloy Steels ◽  
Steel Aisi ◽  
Stainless Steel Aisi

The article presents results of comparative A-TIG welding tests involving selected unalloyed and fine-grained steels, as well as high-strength steel WELDOX 1300 and austenitic stainless steel AISI 304L. The tests involved the use of single ingredient activated fluxes (Cr2O3, TiO2, SiO2, Fe2O3, NaF, and AlF3). In cases of carbon and low-alloy steels, the tests revealed that the greatest increase in penetration depth was observed in the steels which had been well deoxidized and purified during their production in steelworks. The tests revealed that among the activated fluxes, the TiO2 and SiO2 oxides always led to an increase in penetration depth during A-TIG welding, regardless of the type and grade of steel. The degree of the aforesaid increase was restricted within the range of 30% to more than 200%.

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