Performance of TMCP steel with respect to mechanical properties after cold forming and post-forming heat treatment

Porter, David; Laukkanen, Anssi; Nevasmaa, Pekka; Rahka, Klaus; Wallin, Kim

doi:10.1016/j.ijpvp.2004.07.006

Cited by 29 publications

(25 citation statements)

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“…The authors state that the narrow width of this area does not significantly affect the mechanical properties of welded joints. However, it appears that, particularly in cases of steels characterised by a high yield point, this area could develop sensitisation to brittle and fatigue cracking and the reduction of plastic properties [13][14][15][16][17]. In the initial state, steels subjected to the thermomechanical control process have a fine-grained structure additionally hardened through straining.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Steel Subjected to the Thermomechanical Control Process with Respect to Weldability

Górka

2018

Metals

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Abstract:The study is concerned with the assessment of the weldability of steel S700MC subjected to the thermomechanical control process (TMCP) and precipitation hardening and characterised by a high yield point. Appropriate mechanical and plastic properties of steel S700MC were obtained using the thermomechanical control process through precipitation, solution, and strain hardening as well as by using grain-refinement-related processes. Constituents responsible for the hardening of steel S700MC include Ti, Nb, N, and C. The hardening is primarily affected by (Ti,Nb)(C,N)-type dispersive precipitates sized from several nanometres to between ten and twenty nanometres. The welding process considerably differs from TMCP conditions, leading to the reduction of plastic properties both in the heat-affected zone (HAZ) and in the weld area. This study demonstrates that in cases of TMCP steels, where the effect of precipitation hardening is obtained through titanium and niobium hardening phases, the carbon equivalent and phase transformation γ-α cannot constitute the basis of weldability assessment. The properties of welded joints made from the above-named group of steels are primarily affected by the stability of hardening phases, changes in their dispersion, and ageing processes. The most inferior properties were identified in the high-temperature and coarse-grained HAZ area, where the nucleation of hardening phases in the matrix and their uncontrolled reprecipitation in the fine-dispersive form lead to a sharp decrease in toughness.

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Section: Introductionmentioning

confidence: 99%

Assessment of Steel Subjected to the Thermomechanical Control Process with Respect to Weldability

Górka

2018

Metals

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“…Among these, high strength TMCP steel is now spot lighted due to the excellent mechanical properties (Tamehiro et al, 1985;Tsay et al, 1999;Lee et al, 2000;Porter et al, 2004;Shin et al, 2006). TMCP is an acronym for thermomechanical controlled process.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on residual stresses in a multi-pass butt-welded high strength SM570-TMCP steel plate

et al. 2011

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During fusion welding process, complex thermal stresses are inevitably generated. The presence of residual stresses can be detrimental to the integrity and the service behavior of the welded part. In this study, both an experiment and a finite element (FE) method were utilized to investigate residual stress distribution in high strength SM570-TMCP (thermo-mechanical controlled process) steel weldment, which was constructed using a multi-pass butt welding process. Firstly, experiments which included a tensile test at elevated temperatures, an observation of the microstructures and a residual stress measurement were carried out to examine characteristics of residual stresses in the weldment. Secondly, a three-dimensional thermo-mechanical FE model was developed to simulate the temperature field and the residual stress field incorporating the experimental results. The thermo-mechanical model used as well as the experimental procedure is described in detail, and the results obtained from the FE model are compared with the experimental measurements and discussed.

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“…While the present high-strength steel technology has focused on improvement of strength and mechanical properties, achieving higher grades, without reducing toughness properties and weldability of the steels through thermomechanical and alloying treatments (Ref [3][4][5], there has been few work investigating the electrochemical corrosion behavior of high-strength line pipe steels under conditions that are relevant to pipeline operation.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Welded X100 Pipeline Steel in a Near-Neutral pH Solution

Zhang

Cheng

2009

J. of Materi Eng and Perform

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In this work, electrochemical corrosion behavior of a welded X100 pipeline steel was studied in a near-neutral pH solution by electrochemical scanning vibrating electrode technique combined with metallographic and scanning electron microscopy/energy dispersive x-ray analysis. Results demonstrated that a softening phenomenon occurs around the weld, and there is the high micro-hardness in base steel adjacent to weld. In particular, there is the highest micro-hardness in base steel containing acicular ferrite and bainite. Therefore, welding and the associated post-treatment on X100 steel alter dramatically the microstructure and mechanical property around weld, resulting in an enhanced micro-hardness in base steel. There are high and low local dissolution current densities at base steel and the welded zones, respectively. The difference between the maximum and minimum dissolution current densities decreases with time, and the distribution of dissolution current density tends to be uniform. Hydrogen-charging changes the local dissolution activity of the welded steel. Different from the hydrogen-free steel, there is the highest dissolution current density at heat-affected zone. It is reasonable to assume that the charged hydrogen would accumulate at heat-affected zone, and the synergism of hydrogen and local stress results in a high anodic dissolution rate.

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Performance of TMCP steel with respect to mechanical properties after cold forming and post-forming heat treatment

Cited by 29 publications

References 1 publication

Assessment of Steel Subjected to the Thermomechanical Control Process with Respect to Weldability

Assessment of Steel Subjected to the Thermomechanical Control Process with Respect to Weldability

Experimental and numerical investigations on residual stresses in a multi-pass butt-welded high strength SM570-TMCP steel plate

Corrosion of Welded X100 Pipeline Steel in a Near-Neutral pH Solution

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