Cold-bending of linepipe steel plate to pipe, detrimental or beneficial?

Mandal, Arka; Syed, B.; Bhandari, Khilesh Kumar; Bhattacharya, Baby; Deb, Arghya; Singh, Shiv Brat; Chakrabarti, Debalay

doi:10.1016/j.msea.2019.01.005

Cited by 17 publications

(5 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike the longitude samples, the flattening introduces a pre-strain on the transverse specimens. With reference to the cold-bending of steel plate to pipe [21], the strain ε ( x ) imparted due to flattening at a distance ( x ) from the mid-thickness of the thickness t and outer diameter D can be related by the following equation:ε(x)=2xD−t.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Fang

et al. 2019

Materials

View full text Add to dashboard Cite

An integral manufacturing process with hot drawing and cold flow forming was proposed for large-diameter seamless steel gas cylinders. The main purpose of this study was to find out the effects of the manufacturing process on the microstructure and mechanical properties of gas cylinders made of 34CrMo4 steel. Two preformed cylinders were produced by hot drawing. One cylinder was then further manufactured by cold flow forming. The experiments were carried out using three types of material sample, namely, base material (BM), hot drawing cylinder (HD), and cold flow-formed cylinder (CF). Tensile and impact tests were performed to examine the mechanical properties of the cylinders in longitudinal and transverse directions. Microstructure evolution was analyzed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) to reveal the relation between the mechanical properties and the microstructure of the material. It is found that the mechanical properties of the 34CrMo4 steel gas cylinders were significantly improved after hot drawing and flow forming plus a designed heat treatment, compared with the base material. The observations of microstructure features such as grain size, subgrain boundaries, and residual strain support the increase in mechanical properties due to the proposed manufacturing process.

show abstract

Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Fang

et al. 2019

Materials

View full text Add to dashboard Cite

show abstract

“…This is because the water quenching process is followed by vacuum-unloading after deformation, the air would be brought in so that the oxidation occurs on the surface of the material. Mandal et al [22] and Sohn et al [34] have reported the calculation method of strain ε(d) on any plane due to the bending process at a distance by the equation shown below:…”

Section: Micro-hardness Transition and Bending Strain Calculationmentioning

confidence: 99%

“…The bending experiments are easy to be achieved at room temperature if the laboratory permits [21], such as the reports regarding pipeline steel [22], high strength steel [23,24], dual-phase steel [25,26], and DP 590/780 steel [27,28]. However, from an application point of view, there is a dearth of investigation on the effects of practical hot forming technology on the final performance of a spring clip, bending at different angles.…”

Section: Introductionmentioning

confidence: 99%

Ex situ analysis of high-strength quenched and micro-alloyed steel during austenitising bending process: numerical simulation and experimental investigation

Xie

Wang

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

This paper compares the microstructure and mechanical evolution in a high-strength quenched and micro-alloyed steel during the austenitising bending process. Simulation results indicated a new finding that the stress neutral layer (SNL) tends to move to the tension zone during straining. The hardness gradient detected from the centre to compression/tension zones was resulted from comprehensive factors: First of all, the location of SNL revealed a prominent impact on strength. Second, the dislocation accumulation would be responsible for the hardness gradient on the surfaces. In addition, the overall strength decrease during straining was mainly ascribed to integrated effects of dynamic recovery (DRV) and dynamic recrystallisation (DRX). Apart from that, overall smaller martensite packet size and coarser prior austenite grains resulted in the increased hardness value at a lower bending degree. Also, the high consistency between experimental and simulation results is instructive for the practical forming process of railway spring fasteners.

show abstract

“…This is a subject of some interest as the Bauschinger effect, which is the result of different operative stress states, leads to heterogeneous microstructure evolution throughout the bending zone. [8] The response of TRIP-TWIP steels during bending was initially studied by Fei and Hodgson [9] and Shan et al, [10] when springback was evaluated by varying processing parameters such as blank thickness, Young's modulus, and die gap. Subsequently, the work of Kim and Lee [11] was the first to consider the effects of the constituent phases on springback.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Void Formation and Crack Propagation in a Cr–Mn–N Metastable Austenitic Stainless Steel During Bending

Kamali

Xie

et al. 2022

Adv Eng Mater

View full text Add to dashboard Cite

Microstructure evolution via deformation-induced martensitic transformation, void formation, and crack propagation is investigated in a metastable austenitic Cr-Mn-N stainless steel for up to 90°bending using a combination of electron backscattering diffraction and parent grain reconstruction. Stress-strain heterogeneity and stress triaxiality studied using finite-element analysis reveal that the inner and outer radii are in approximately uniaxial compressive and tensile stress states, respectively, with the outer radius showing higher values for von Mises and principal stresses and equivalent strain. Voids are observed at both austenite/α 0 -martensite and α 0 /α 0 -martensite interfaces. Parent grain reconstruction applied to the 90°bending sample reveal that the cracks at α 0 /α 0martensite interfaces tend to propagate predominantly along intergranular parent austenite grain boundaries. It is also found that both intragranular and intergranular cracks in parent austenite tend to propagate between α 0 -martensite child-child grains comprising the same crystallographic packets. This is the first study of its kind to comprehensively show this phenomenon. A representative example of intergranular crack propagation within a 110 h i‖normal direction (ND)-oriented parent austenite grain is also demonstrated.

show abstract

Cold-bending of linepipe steel plate to pipe, detrimental or beneficial?

Cited by 17 publications

References 58 publications

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Ex situ analysis of high-strength quenched and micro-alloyed steel during austenitising bending process: numerical simulation and experimental investigation

Void Formation and Crack Propagation in a Cr–Mn–N Metastable Austenitic Stainless Steel During Bending

Contact Info

Product

Resources

About