Effect of TMCP Parameters on the Microstructure and Properties of the API X60 Pipeline Steels

2011 ◽  
Vol 391-392 ◽  
pp. 437-441
Author(s):  
Wen Ning Mu ◽  
Shuang Zhi Shi
Keyword(s):  
Mechanical Properties ◽  
Control Process ◽  
Polygonal Ferrite ◽  
Experimental Results ◽  
Technological Parameters ◽  
Pipeline Steels ◽  
Mechanical Control ◽  
Microstructure And Properties ◽  
Mixed Microstructure ◽  
Strength And Ductility

Effects of technological parameters of thermo mechanical control process (TMCP) on microstructure and mechanical properties of the API X60 pipeline steels have been investigated. The parameters of TMCP for obtaining better mechanical properties are given. The experimental results show that the mixed microstructure mostly composed of polygonal ferrite, pearlite/bainite and martensite-austenite constituent (M-A) has the optimum strength and ductility.

Effect of Heat Treatment on Microstructure and Mechanical Properties of 800MPa Grade Ultra Low Carbon Bainite Steel

2011 ◽  
Vol 415-417 ◽  
pp. 943-946 ◽  
Author(s):  
Zhan Lei Wei ◽  
Long Fei Zuo ◽  
Ben Ma ◽  
Li Xian Zhang ◽  
Hong Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Control Process ◽  
Residual Austenite ◽  
Polygonal Ferrite ◽  
Low Carbon ◽  
Ti Alloys ◽  
Bainite Steel ◽  
Low Carbon Bainite ◽  
Quenching And Tempering ◽  
Strength And Ductility

A new kind of bainite steel with ultra-low carbon content and Nb, Ti alloys has been developed. By applying thermomechanical control process, water quenching and tempering at different temperature, excellent properties have been obtained when tempered at 450°C, with the yield strength of 813MPa and elongation of 16.2%. The morphology observed by SEM shows that the microstructure consists of fine lath-shaped bainite, polygonal ferrite, quasi-polygonal ferrite and a small fraction of residual austenite or martensite-austenite constituents. In a TEM study plenty of precipitates with the size about 5-10nm were observed interacting with the dislocations, which is very significant for the optimization of strength and ductility.

Influence of Aging Treatment on Microstructure and Properties of GH2132

2014 ◽  
Vol 1082 ◽  
pp. 173-176
Author(s):  
Chun Lin Yang ◽  
Jie Zhu ◽  
Mei Gui Ou ◽  
Zu Jian Yang
Keyword(s):  
Mechanical Properties ◽  
Aging Treatment ◽  
Experimental Results ◽  
Microstructure And Properties

Effect of Aging on microstructure and properties of GH2132 Alloy was studied. Experimental results show that a considerable number of sphericalγ′phase distributed uniformly under solution at 982°C solution for 1h and 718°C aging for 1h. The aging treatment made GH2132 obtain good mechanical properties.

Comparison of Two Different Rolling Processes on Microstructure and Properties of Ferrite-Bainite Dual-Phase Pipeline Steels

2011 ◽  
Vol 197-198 ◽  
pp. 724-729 ◽  
Author(s):  
Yue Yue Hu ◽  
Xiu Rong Zuo ◽  
Ru Tao Li ◽  
Zhen Wei Wang
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Intercritical Annealing ◽  
Control Process ◽  
Ferrite Matrix ◽  
Optical Microscope ◽  
Rolling Plane ◽  
Dual Phase ◽  
Average Volume ◽  
Pipeline Steels

The microstructure and mechanical properties of ferrite-bainite dual-phase pipeline steels respectively produced by thermomechanical control process (TMCP) and intercritical annealing were studied using optical microscope, scanning electron microscope (SEM), Vickers hardness tester and MTS 810 servo-hydraulic machine. The results show that these two processes obtain different morphology and distribution of microstructure, but the mechanical properties of them are similar and superior, especially the yield ratios are low. It is found that for TMCP steel, the grains of ferrite are large and the average ferrite grain size is approximately 6.1µm. The bainite structures are lump-shaped with concentrated distribution in the ferrite matrix and the band structure is obvious. For steels produced by intercritical annealing process, the grains are finer and the distribution of bainite is uniform on the ferrite grain boundaries. From the rolling plane to the centre, the grain sizes of ferrite in these two microstructures increase obviously, and the volume fraction of bainite first increases significantly, then decreases slightly in the TMCP steel and the average volume fraction is approximately 60.1%. However, the bainite volume fraction in the intercritical annealing steel decreases gradually and the average volume fraction is approximately 35.4%. Moreover, hardness values in through-thickness direction are uniform in the TMCP steel and these values are also similar in the intercritical annealing steel except the values in the region near the rolling plane are much larger.

scholarly journals Modelling of Microstructural Evolution and Mechanical Properties of Steel Plates Produced by Thermo-Mechanical Control Process.

1992 ◽  
Vol 32 (3) ◽  
pp. 395-404 ◽  
Author(s):  
Atsuhiko Yoshie ◽  
Masaaki Fujioka ◽  
Yoshiyuki Watanabe ◽  
Kiyoshi Nishioka ◽  
Hirofumi Morikawa
Keyword(s):  
Mechanical Properties ◽  
Microstructural Evolution ◽  
Control Process ◽  
Steel Plates ◽  
Mechanical Control

Influence of Pretreatment Process on Microstructure and Properties of 65Mn Steel after Subcritical Quenching

2013 ◽  
Vol 310 ◽  
pp. 55-58
Author(s):  
An Ming Li
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Experimental Results ◽  
Inverse Transformation ◽  
Microstructure And Properties ◽  
Microstructure And Mechanical Properties ◽  
Mn Steel ◽  
Martensite Structure

Quenching and normalizing is selected as the pretreatment process. Microstructure and mechanical properties of subcritical quenched 65Mn steel are investigated when different pretreatment is used. The experimental results show that the content and grain size of the martensite in the 65Mn steel after subcritical quenched are related with pretreatment process. The mechanical properties are determined by the pretreatment process. 65Mn steel exhibits very fine martensite structure when pretreatment process is quenching. The tensile strength and hardness is 65 Mn steel with the pretreatment process of quenching are higher than that of normalizing. The mechanical properties of 65Mn steel can be improved by austenite inverse transformation subcritical quenching. Classifying number in China: TG156

Effects of Thermo-Mechanical Control Process on the Microstructure and Properties of the Welded Joints of ERW OCTG

2011 ◽  
Vol 189-193 ◽  
pp. 3564-3569
Author(s):  
Zong Yue Bi ◽  
Jun Wang ◽  
Xiao Tian Jing
Keyword(s):  
Welded Joints ◽  
Performance Optimization ◽  
Electrical Resistance ◽  
Control Process ◽  
Mechanical Control ◽  
Microstructure And Properties ◽  
Proeutectoid Ferrite ◽  
Temperature Impact ◽  
Low Temperature Impact Toughness

In the paper, the effects of thermo-mechanical control process on microstructure and properties of oil country tubular goods by electrical resistance welding are analyzed. The TMCP parameters are optimized by Gleeble-1500 thermo-mechanical simulator, and industrial trial is carried out. The microstructures in the welded joints of original ERW OCTG are mainly composed of proeutectoid ferrite, pearlite and widmanstatten. In contrast, the welded joints of ERW OCTG treated by TMCP consist only of refined ferrite and pearlite. The higher low-temperature impact toughness and the better resistance to the grooving corrosion of the welded joints of ERW OCTG treated by TMCP could be attributed to removing welding residual stresses, homogenizing microstructure, eliminating porosity and refining grain. TMCP facilitates the performance optimization of welded joints so that the quality of the finished product can be improved.

Effect of Phosphorus on Microstructure and Properties of Al-Mg2Si Alloys Subjected to Electromagnetic Stirring

2011 ◽  
Vol 291-294 ◽  
pp. 652-657 ◽  
Author(s):  
Yu Yan Ren ◽  
Ying Min Li
Keyword(s):  
Mechanical Properties ◽  
Low Cost ◽  
Holding Time ◽  
Experimental Results ◽  
Electromagnetic Stirring ◽  
Low Density ◽  
Alloying Element ◽  
Manufacture Technology ◽  
Elastic Modules ◽  
Strength And Ductility

Al-Mg2Si composite has such advantages as low density, high elastic modules, simple manufacture technology and low cost. However, its strength and ductility need to be enhanced. Thus, the alloying element P was added to control the microstructure of Al-Mg2Si alloy and furthermore improve the mechanical properties of the composite. The experimental results show that the microstructure of the Al-Mg2Si alloys subjected to electromagnetic stirring can be significantly refined and the mechanical properties of the alloy get improved due to the addition of phosphorus. It is found that the best modification effect can be achieved when the adding amount of phosphorus is in the range from 0.7% to 1.1% and the holding time is about 15 minutes, and the mechanical properties of the Al-Mg2Si alloys get markedly enhanced.

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