“…Making a comparison of the results of the maximum and minimum residual stresses, considering the region of the interface between BM and HAZ in the austenitic stainless steel AISI 316L along the depth, varying the interpass temperature, it was observed that the lower the interpass temperature in the larger sample will be the value of the residual stress in it, due to the longer time in the cooling cycle generating greater distortions in the crystalline structure of the material 12 . The results obtained in residual stress by the Hole-Drilling Method in the Inconel 718 alloy and the stainless steel AISI 316L were similar to those observed in the studies conducted by Mathieu et al 13 .…”
Section: Conclusion Remarkssupporting
confidence: 88%
“…The results obtained in the hardness profile were consistent, where higher hardness values were observed in the transition region of the Inconel 718 alloy and its respective HAZ compared to the transition region of stainless steel AISI 316L and its respective HAZ, wherein the transverse direction the welded joint the chemical composition of the Inconel 718 alloy is diluted in the 316L stainless steel, resulting in a gradual decrease of the microhardness 13,14 . The same relation between interlocking temperature and microhardness was observed in studies conducted by Demarque 9 and Oliveira 6 .…”
Stainless steel and nickel alloy have high corrosion resistance in high-temperature environments due to the high Cr content present in their chemical composition, being widely used in components of nuclear reactors, petrochemical industries, etc. Through proper processes and procedures, it becomes possible to join these alloys. However, this union can generate detrimental factors in its performance, among them, the residual stresses. In this work, the residual stresses generated by the autogenous GTAW process, due to different interpass temperatures on the weld bead geometry, were analyzed by the Hole-Drilling technique in dissimilar welding joints of stainless steel AISI 316L and Inconel 718 alloy. In addition, the Vickers microhardness measurements were carried out to evaluate the hardness profile in the cross section of the weld bead covering base metal (BM), heat affect zone (HAZ) and weld metal (WM). We found that in the interface region between BM and HAZ of each dissimilar joint metal, residual stresses increased above 300 MPa, while hardness increased above 160 HV.
“…Making a comparison of the results of the maximum and minimum residual stresses, considering the region of the interface between BM and HAZ in the austenitic stainless steel AISI 316L along the depth, varying the interpass temperature, it was observed that the lower the interpass temperature in the larger sample will be the value of the residual stress in it, due to the longer time in the cooling cycle generating greater distortions in the crystalline structure of the material 12 . The results obtained in residual stress by the Hole-Drilling Method in the Inconel 718 alloy and the stainless steel AISI 316L were similar to those observed in the studies conducted by Mathieu et al 13 .…”
Section: Conclusion Remarkssupporting
confidence: 88%
“…The results obtained in the hardness profile were consistent, where higher hardness values were observed in the transition region of the Inconel 718 alloy and its respective HAZ compared to the transition region of stainless steel AISI 316L and its respective HAZ, wherein the transverse direction the welded joint the chemical composition of the Inconel 718 alloy is diluted in the 316L stainless steel, resulting in a gradual decrease of the microhardness 13,14 . The same relation between interlocking temperature and microhardness was observed in studies conducted by Demarque 9 and Oliveira 6 .…”
Stainless steel and nickel alloy have high corrosion resistance in high-temperature environments due to the high Cr content present in their chemical composition, being widely used in components of nuclear reactors, petrochemical industries, etc. Through proper processes and procedures, it becomes possible to join these alloys. However, this union can generate detrimental factors in its performance, among them, the residual stresses. In this work, the residual stresses generated by the autogenous GTAW process, due to different interpass temperatures on the weld bead geometry, were analyzed by the Hole-Drilling technique in dissimilar welding joints of stainless steel AISI 316L and Inconel 718 alloy. In addition, the Vickers microhardness measurements were carried out to evaluate the hardness profile in the cross section of the weld bead covering base metal (BM), heat affect zone (HAZ) and weld metal (WM). We found that in the interface region between BM and HAZ of each dissimilar joint metal, residual stresses increased above 300 MPa, while hardness increased above 160 HV.
“…Regardless of drilling conditions, the temperature increases during the drilling operation. The drilled depth has an important influence on the temperature reached in the workpiece and thus, the surface integrity evolve along the drilling depth, it is demonstrated in an additional study [16]. At the end of the drilling operation, residual stresses are more tensile than at the beginning of the drilling.Fig.…”
Section: Resultsmentioning
confidence: 79%
“…The thickness of the affected layer increases by about 0.2 mm.Fig. 14Summary of thermal and mechanical constraints imposed during drilling operations and residual stresses involved [16].…”
Section: Resultsmentioning
confidence: 99%
“…Summary of thermal and mechanical constraints imposed during drilling operations and residual stresses involved [16].…”
Drilling processes can significantly affect the surface integrity of metallic components. Thus, the control of the drilling process is of great interest for industry to ensure a satisfactory surface behavior. The understanding of such a process is complex because the hole is confined. Therefore, the physical phenomena are not easily observable during a drilling operation. The aim of this article is to present an experimental investigation on the effect of the drilling conditions for the machining of an austenitic stainless steel 316L. Three cases of lubrication are studied: internal coolant, external coolant and dry. The objective is to identify the mechanical and thermal contributions on surface integrity. In this study, the influence of the lubrication conditions is first characterized during the drilling operation (temperatures around the drilled surface, forces…). Then, the effect of lubrication on the surface integrity after drilling is clearly highlighted by analyzing the hole diameters, the drill deflections, the roughness, the residual stresses, the hardness and the microstructure.
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