scholarly journals Microstructure Evolution of Cold Pilgering Stainless Steel Tubes

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Jia Dai ◽  
Wei Li ◽  
Zhibing Chu
Keyword(s):  
Stainless Steel ◽  
Microstructure Evolution ◽  
Equivalent Stress ◽  
Metal Flow ◽  
Outer Wall ◽  
Steel Tube ◽  
Experimental Results ◽  
Slip Zone ◽  
Wall Structure ◽  
Finite Element Software

The 347 stainless steel tube cold rolling test was carried out by a LG60 two-roll pilger mill. The microstructure evolution was examined by microscope, SEM, and XRD tests. The finite element software DEFORM-3D has been used to simulate the pilgering process, and the obtained equivalent stress and metal flow were analyzed. The experimental results showed that the internal slip line was randomly distributed, the deformation of the inner wall was more intense than the outer wall structure, and the austenite γ phase was transformed into the α′-martensitic phase. The simulation results indicated that the direction of metal flow was constantly changing, and the equivalent stress of the inner wall of the steel tube was greater than the equivalent stress of the outer wall. In addition, the slip zone of the inner wall of the characteristic section was more severe than that near the outer wall slip zone. The simulation verified the experimental results to some extent.

Discussion on Roundness of Non-Ferromagnetic Tube by Interior Magnetic Abrasive Finishing Using a Magnetic Machining Jig

2021 ◽  
Vol 1018 ◽  
pp. 105-110
Author(s):  
Jiang Nan Liu ◽  
Yan Hua Zou
Keyword(s):  
Stainless Steel ◽  
Dynamic Equation ◽  
Steel Tube ◽  
Experimental Results ◽  
Stainless Steel Tube ◽  
Helical Motion ◽  
Magnetic Pole ◽  
Magnetic Abrasive Finishing ◽  
Sus304 Stainless Steel ◽  
Abrasive Finishing

In this study, mainly researching the improvement of roundness of thick SUS304 stainless steel tube by interior magnetic abrasive finishing using a magnetic machining jig. The influence of reciprocating velocity of magnetic pole unit on the improvement of roundness of interior surface was studied by establishing the dynamic equation of magnetic machining jig. Experimental results showed that low reciprocating velocity of magnetic pole unit is conducive to the improvement of interior roundness of the thick SUS304 stainless steel tube. The reason is that the low reciprocating velocity of magnetic pole unit reduces the pitch of the helical motion and can produce greater finishing force of the magnetic machining jig.

Effect of Wall Thickness of the Billet on 1Cr18Ni9 Stainless Steel Tube Stagger Spinning Process

2014 ◽  
Vol 852 ◽  
pp. 244-247
Author(s):  
Shu Heng Yang ◽  
Xue Li Wang
Keyword(s):  
Finite Element Method ◽  
Stainless Steel ◽  
Wall Thickness ◽  
Metal Flow ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Flow Rule ◽  
Spinning Process ◽  
Inner Diameter ◽  
Spinning Force

The stagger spinning process of 1Cr18Ni9 tube was investigated by using finite element method. The metal flow rule around the roller during the tube stagger spinning was analyzed. The influences of wall thickness of the billet on effective stress and spinning force were studied using software Deform. The simulated results indicate that the proper wall thickness of the billet should be 8~15 mm, for the billet with length of 100mm and inner diameter of 200mm.

Optimal Design and Process Analysis of the Blade for High-Speed Shearing Stainless Steel Tube

2010 ◽  
Vol 139-141 ◽  
pp. 797-800
Author(s):  
Jun Sun ◽  
Yu Ling Wang ◽  
Bo Lu
Keyword(s):  
Stainless Steel ◽  
High Speed ◽  
Process Analysis ◽  
Steel Tube ◽  
Contour Line ◽  
Stainless Steel Tube ◽  
Finite Element Software ◽  
Chip Flow ◽  
The Relationship

This paper mainly researches on the effect from high-speed shearing tool to the quality of stainless steel tube cutting. At first, the relationship between contour line of vertical blade and the direction of shear force and chip flow are studied, and the influence on the quality of shearing caused by the size of blanking clearance is analyzed. Then a new blade contour line that made most of the iron chippings is located outside of the tube and reasonable blanking clearance is obtained. Further, based on the tearing caused by single-blade shear on the top of steel tube, the shape and angle of the vertical blade are studied, and the structure of the vertical blade nose is optimized, which improves the shearing quality of the blade. Finally, the numerical simulation of the process of shearing is done to verify the feasibility of the designed structure by the finite element software DEFORM.

Finite Element Simulation Analysis of Cold Rolling Process for Stainless Steel Tube

2012 ◽  
Vol 182-183 ◽  
pp. 1494-1498
Author(s):  
Yong Hua Li ◽  
Tao Fan ◽  
Xin Jun Liang
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Cold Rolling ◽  
Finite Element Simulation ◽  
Rolling Process ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Flow Rule ◽  
Finite Element Software ◽  
Element Simulation

The 3D finite element simulation of three-roller cold rolling model for stainless steel tube was established using finite element software MSC. Marc. The metal flow rule of contact deformation zone, the distributions of equivalent stress and strain were analyzed. The experiment of cold rolling process was carried out based on the technical parameters of the simulation.

Thermal Coupled FEM Analysis of Precision Roll Forging Performing of Automobile Front Axle

2012 ◽  
Vol 557-559 ◽  
pp. 1330-1335
Author(s):  
Ru Xiong Li ◽  
Song Hua Jiao
Keyword(s):  
Equivalent Stress ◽  
Metal Flow ◽  
Fem Analysis ◽  
Front Axle ◽  
Die Design ◽  
Technological Condition ◽  
Rigid Plastic ◽  
Flow Process ◽  
Finite Element Software ◽  
Forging Die

According to the characters, technological condition and requirements of automotive front axle forging, both the process of exact roll-forging billet and die design are studied, as the result, roll- forging die of front axle billet, pre-completed roll-forging die and final roll-forging die are design respectively, finally the groove with hat cross-section is analyzed and top pressure rolling method is proposed during blank-making roll-forging process. The precision rolling forging performing deformation process of automobile front axle is simulated with finite element software Deform-3D by using 3D thermo-mechanical coupled rigid plastic FEM. The metal flow process, equivalent stress and strain field, temperature field and load status of rolling die are analyzed, and they are consistent with experiments. This provides a dependable theoretical basis for understanding the deforming mechanism and selecting reasonable parameters for the precision rolling forging performing of front axle.

Dynamic Analysis and Experimental Measurements for a Single Fluid Heat Exchanger

1966 ◽  
Vol 88 (1) ◽  
pp. 137-139 ◽  
Author(s):  
P. S. Lall ◽  
R. J. Schoenhals
Keyword(s):  
Stainless Steel ◽  
Heat Exchanger ◽  
Dynamic Response ◽  
Dynamic Analysis ◽  
Coordinate System ◽  
Steel Tube ◽  
Experimental Results ◽  
Stainless Steel Tube ◽  
Experimental Measurements ◽  
Thin Walled

The Lagrangian method of description was used, as opposed to the Eulerian coordinate system, in studying the dynamic response of a single fluid heat exchanger. Experimental measurements are reported for a heated thin walled stainless steel tube. Comparison of the analytical and experimental results is given.

scholarly journals Contrasting the Role of Pores on the Stress State Dependent Fracture Behavior of Additively Manufactured Low and High Ductility Metals

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3657
Author(s):  
Alexander E. Wilson-Heid ◽  
Erik T. Furton ◽  
Allison M. Beese
Keyword(s):  
Stainless Steel ◽  
Stress State ◽  
Pore Size ◽  
Fracture Behavior ◽  
316L Stainless Steel ◽  
Equivalent Stress ◽  
Failure Behavior ◽  
High Ductility ◽  
State Dependent ◽  
Fracture Models

This study investigates the disparate impact of internal pores on the fracture behavior of two metal alloys fabricated via laser powder bed fusion (L-PBF) additive manufacturing (AM)—316L stainless steel and Ti-6Al-4V. Data from mechanical tests over a range of stress states for dense samples and those with intentionally introduced penny-shaped pores of various diameters were used to contrast the combined impact of pore size and stress state on the fracture behavior of these two materials. The fracture data were used to calibrate and compare multiple fracture models (Mohr-Coulomb, Hosford-Coulomb, and maximum stress criteria), with results compared in equivalent stress (versus stress triaxiality and Lode angle) space, as well as in their conversions to equivalent strain space. For L-PBF 316L, the strain-based fracture models captured the stress state dependent failure behavior up to the largest pore size studied (2400 µm diameter, 16% cross-sectional area of gauge region), while for L-PBF Ti-6Al-4V, the stress-based fracture models better captured the change in failure behavior with pore size up to the largest pore size studied. This difference can be attributed to the relatively high ductility of 316L stainless steel, for which all samples underwent significant plastic deformation prior to failure, contrasted with the relatively low ductility of Ti-6Al-4V, for which, with increasing pore size, the displacement to failure was dominated by elastic deformation.

scholarly journals Hot Deformation Behavior and Dynamic Recrystallization of Ultra High Strength Steel

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1239
Author(s):  
Liping Zhong ◽  
Bo Wang ◽  
Chundong Hu ◽  
Jieyu Zhang ◽  
Yu Yao
Keyword(s):  
Martensitic Steel ◽  
High Strength ◽  
Experimental Results ◽  
Hot Deformation Behavior ◽  
Thermal Compression ◽  
Forging Process ◽  
Finite Element Software ◽  
Ultra High Strength Steel ◽  
Recrystallized Grain Size ◽  
Deform 3D

In this paper, in order to improve the microstructure uniformity of an ultra-high strength martensitic steel with a strength greater than 2500 MPa developed by multi-directional forging in the laboratory, a single-pass hot compression experiment with the strain rate of 0.01 to 1 s−1 and a temperature of 800 to 1150 °C was conducted. Based on the experimental data, the material parameters were determined, the constitutive model considering the influence of work hardening, the recrystallization softening on the dislocation density, and the recrystallized grain size model were established. After introducing the model into the finite element software DEFORM-3D, the thermal compression experiment was simulated, and the results were consistent with the experimental results. The rule for obtaining forging stock with a uniform and refinement microstructure was acquired by comparing the simulation and the experimental results, which are helpful to formulate an appropriate forging process.

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