Effect of Different Cooling Rates on Microstructure and Property of Continuous Annealing IF Steel

2016 ◽  
Vol 850 ◽  
pp. 631-635
Author(s):  
Ru Wen Zheng ◽  
Ren Bo Song ◽  
Wu Yan Fan ◽  
Wei Wang ◽  
Ke Guo ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Cooling Rate ◽  
Annealing Process ◽  
Recrystallization Temperature ◽  
Continuous Annealing ◽  
Second Phase ◽  
If Steel ◽  
Cooling Rates ◽  
Grain Sizes ◽  
Batch Annealing

The influence of different annealing cooling rates on microstructure,precipitation of the second phase and mechanical properties of IF steel was studied. The recrystallizing behavior of IF steels was analyzed by batch annealing process. After confirming the recrystallizing temperature of IF steel, the simulations of different continuous annealing cooling rates (5°C/s, 20°C/s, 50°C/s, 200°C/s 500°C/s and 1000°C/s ) were performed. At the same time, combined with TEM and XRD, the precipitating behavior and microstructure texture were analyzed. The results showed that the recrystallization temperature was speculated between 540°C and 560°C. As the cooling rate increased, the grain sizes became smaller and the yield strength increased significantly. And the tensile strength and elongation were more or less static. The tensile strength remained 240MPa and the elongation kept around 50%. With 1000°C/s cooling rate, the sample performed best with the r-value of 3.03. TiN precipitation was observed. The annealed texture is mostly composed of {111} texture.

Recrystallization Law of Ti-IF Steel During Annealing Process

2011 ◽  
Vol 399-401 ◽  
pp. 2301-2304
Author(s):  
Yan Qing Feng ◽  
Zhi Guo Gao ◽  
Fu Ming Wang
Keyword(s):  
Annealing Temperature ◽  
Secondary Recrystallization ◽  
Annealing Process ◽  
Recrystallization Temperature ◽  
Continuous Annealing ◽  
If Steel ◽  
Effect Factor ◽  
Batch Annealing ◽  
Main Effect ◽  
Different Temperatures

Recrystallization law was investigated at different annealing processes. The results showed that the annealing temperature was a main effect factor on the properties of Ti-IF steel. Nominal recrystallization temperature of the samples was evaluated as 620 °C. Simulated batch annealing was performed by two-stage heating. Determined recrystallization temperature was 660 °C, the recrystallization of samples heated at 660 °C was completed in 68min. For 800 °C, the equiaxial recrystallized grains were obtained. Simulated continuous annealing by rapidly heating to different temperatures, samples were held for 100s and then cooled in air. Recrystallization nucleation was not observed until 660 °C. The occurrence of secondary recrystallization was observed at 900 °C.

Microstructure and Texture Evolution Law of Ti-IF Steel for Extra Deep Drawing during Batch Annealing Process

2013 ◽  
Vol 873 ◽  
pp. 42-47
Author(s):  
Zheng Bing Meng ◽  
Lang He ◽  
Guang Liang Wu ◽  
Xin Bin Liu ◽  
Chao Yang Zhou
Keyword(s):  
Deep Drawing ◽  
Early Stage ◽  
Texture Evolution ◽  
Annealing Process ◽  
Recrystallization Temperature ◽  
Recrystallization Annealing ◽  
Recrystallization Process ◽  
If Steel ◽  
Hardness Tester ◽  
Batch Annealing

The variation of microstructure of Ti-IF steel of extra deep drawing grade, which having a 83%cold-rolled deformation under simulated batch annealing process at temperature ranging from 480°C to 750°C, was studied by using optical microscopy, X-ray diffraction (XRD) and metallographic micro-hardness tester. The evolution of texture during the recrystallization process was analyzed by Orientation Density Function (ODF). The results show that, the recrystallization temperature of experimental steel is 620-630°C, and the recrystallization process can be accomplished within 1h at660°C. Four major textures after cold rolling are observed as follows,{001}<110>, {111}<110>, {111}<112> and {112}<110>, respectively. At the early stage of recrystallization annealing, texture evolves from {111} toγ-{111}, which is quite beneficial to achieve high deep drawing performance,the texture {001}<110> and {112}<110> change marginally. as the annealing temperature rises up to 720°C, texture {001}<110> and {112}<110> change into fiber textureγ-{111}. After annealing,{111}<112> and {111}<110> textures become the two main types.

A Quantitative Study of Precipitation Evolution during Annealing Treatments of a Ti-IF Steel

2011 ◽  
Vol 228-229 ◽  
pp. 1156-1162
Author(s):  
Guo Ming Zhu ◽  
Chao Lu ◽  
Yong Lin Kang ◽  
Lu Feng Gao
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Annealing Temperature ◽  
Annealing Process ◽  
Continuous Annealing ◽  
If Steel ◽  
Batch Annealing ◽  
Tic Particle ◽  
Evolution Of Precipitates

The evolution of precipitates size distribution of Ti-IF steel during annealing process has been investigated by simulating different continuous annealing (CA) and batch annealing (BA) treatments. The size and distributions of the precipitates (TiC in particular) are obtained by TEM observation and measured image analysis. They are then fitted by log-normally distribution and a model demonstrating the relationships of particle size distribution with annealing process parameters has been developed and validated by experiment results. The fine TiC precipitates (< 30 nm) vary after different annealing treatments. The effects of annealing temperature and holding time on the evolution of TiC particle size distribution are discussed.

scholarly journals Effect of Annealing Process on the Mechanical Properties of X70 Pipeline Steel

2018 ◽  
Vol 186 ◽  
pp. 02001
Author(s):  
Teng-wei Zhu ◽  
Cheng-liang Miao ◽  
Zheng Cheng ◽  
Zhipeng Wang ◽  
Yang Cui ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Annealing Temperature ◽  
Pipeline Steel ◽  
Annealing Process ◽  
X70 Pipeline Steel ◽  
Grain Sizes ◽  
Scanning Electron

The influence of the mechanical properties of X70 pipeline steel under different annealing temperature was studied. The corresponding microstructure was investigated by the Field Emission Scanning Electron Microscopy. The results showed that the yield strength and the tensile strength both experienced from rise to decline with the increase of annealing temperature. The grain sizes were coarse and a large amount of cementite precipitated due to preserving temperature above 550 °, which induced matrix fragmentation and deteriorate the -10 ° DWTT Toughness. There were little changes on the microstructure and mechanical properties when the annealing temperature was under 500 °.

Study on Continuous Annealing Process for Ultrathin Cold-Rolled SPCC Steel

2015 ◽  
Vol 817 ◽  
pp. 268-272
Author(s):  
Wu Yan Fan ◽  
Ren Bo Song ◽  
Ru Wen Zheng ◽  
Pei Sheng Yao
Keyword(s):  
Annealing Temperature ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Precipitation Behavior ◽  
Transmission Electron ◽  
Batch Annealing ◽  
Thin Steel ◽  
Cold Rolled ◽  
R Value ◽  
General Specification

The continuous annealing process was simulated on the heat treatment system for thin steel sheet (CCT-AY-II). As the recrystallization was known, the annealing temperature and holding time were taken into account to study the influence on microstructure and mechanical properties of 0.08mm ultrathin cold-rolled SPCC steel. Combined with transmission electron microscope (TEM), the precipitation behavior was analyzed. The optical micrographs show that the microstructure of the samples are more similar to batch-annealing steel rather than general specification SPCC steel through continuous annealing. With 5°C/s heating rate and annealed at 860°C for 80s, the sample performs best: the yield strength is 161MPa, the elongation is 29% and the r-value is 1.51. AlN and MnS precipitations are observed in the inner grain and at grain boundary. The annealed textures mostly composed of {111} texture. The highest intensity is centered around the {111}<110> orientation.

Influences of Hot Rolling Conditions on the Microstructure and Mechanical Properties of Low-Alloy Steel

2011 ◽  
Vol 391-392 ◽  
pp. 214-218
Author(s):  
Hai Shen Sun ◽  
Guo Ping Li ◽  
Wen Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Cooling Rate ◽  
Second Phase ◽  
Elongation Ratio ◽  
Technological Parameters ◽  
Microstructure And Mechanical Properties ◽  
Test Steel ◽  
Hot Rolling Conditions

The thermomechanical control processing (TMCP) was conducted through the adjustment of the rolling technological parameters to the test steel. The influence of the finishing temperature, cooling rate and alloying elements to the microstructure and mechanical properties was investigated by comprehensive utilization of grain refining strengthening and second phase strengthening.The results show that the microstructure was mainly composed of bainite, ferrite and second phase TiC; at the finishing temperature of 870°C, the yield strength was 596.7 MPa, the tensile strength reached 748.5 MPa, the elongation ratio was 20.17%; at high cooling rate of 16°C/s, the yield strength achieved 616.7 MPa, the tensile strength reached 785.5 MPa, the tensile ratio reduced for 0.78, and the elongation ratio enhanced to 20.92%. And the quantity of bainite increased with the raise of finishing temperature from 800°C to 870°C, which improved the hardness and wear resistance of the steel.

Study on Middle Annealing Process of HSn88-1 Alloy

2015 ◽  
Vol 727-728 ◽  
pp. 253-257
Author(s):  
Guo Jie Huang ◽  
Ji Miao Ma ◽  
Yang Zhao ◽  
Dong Ya Wang ◽  
Li Jun Peng
Keyword(s):  
Tensile Strength ◽  
Annealing Treatment ◽  
Annealing Process ◽  
Recrystallization Temperature

The tensile strength, elongation and microstructure of alloy are respectively tested and observed after annealing treatment. The results show that the working rate the larger, the initial recrystallization temperature the lesser. The proper middle annealing process of HSn88-1 alloy with 80% deformation is 460°C×5h.

scholarly journals Effect of cooling rates after annealing on the microstructure and properties of 1000MPa grade automobile steel for cold forming

2021 ◽  
Author(s):  
Ruifeng Dong ◽  
Qingbo Zhao ◽  
Xiaohong Bi ◽  
Deng Xiangtao ◽  
Wentian Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cooling Rate ◽  
Testing Machine ◽  
Phase Region ◽  
Two Phase ◽  
Tensile Testing Machine ◽  
Cooling Rates ◽  
Cold Forming ◽  
Automobile Steel

Abstract The effects of different cooling rates ( 0.05℃/s, 0.1℃/s, and 0.2℃/s ) on the microstructure and mechanical properties of 1000 MPa grade automobile steel for cold forming after two-phase annealing were studied. The microstructure of the experimental steel was observed by SEM and TEM, and its mechanical properties were tested by a universal tensile testing machine. The results showed that by increasing the cooling rate of two-phase annealing, more massive retained austenite, more uniform and fine ferrite, better elongation and higher ultimate tensile strength of steel can be obtained, so as to obtain better production of tensile strength and total elongation ( product of tensile strength and elongation, PSE ). The final result shows that after the test steel is quenched at 800℃ + 10 minutes and annealed in the two-phase region at 690℃ + 10 minutes, the faster the cooling rate, the better the mechanical properties. The mechanical properties of the steel plate are the best when the cooling rate reaches 0.2℃/s, and PSE can reach 27.44 GPa·%.

Continuous Annealing Process and Microstructure Property of 1200mpa High Strength Steel by Ultrafast Cooling

2014 ◽  
Vol 788 ◽  
pp. 351-356 ◽  
Author(s):  
San Chuan Yu ◽  
Ren Bo Song ◽  
Qi Feng Dai ◽  
Zhe Gao
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Cooling Rate ◽  
Room Temperature ◽  
Annealing Temperature ◽  
High Strength ◽  
Continuous Annealing ◽  
Experimental Steel ◽  
Steel Increase ◽  
Ultrafast Cooling

The different dilatometric curves of continuous cooling transformation have been determined by DIL805 thermal mechanical simulate, through metallographic and hardness method to study the effect of different cooling rate on the microstructure of transition. The critical point Ac1 and Ac3 of the tested steel are 709°C and 865°C. With the increase of cooling rate, the hardness of the steel and the content of martensite increase. In the laboratory conditions, the steel in this experiment was heated to 780°C, 800°C, 820°C, 840°C and 860°C, for 80s, then slowly cooled to 680°C, and water quenched to room temperature finally. The aging temperature was 240°C for 300s, and the last the sample was air cooled to room temperature. The results show that the microstructure of the annealed experimental steel belongs to martensite and ferrite. With the increase of annealing temperature, the content of martensite, the tensile strength and yield strength of the experimental steel increase, and the elongation decreases continuously. The sample was annealed at 800°C for 80s, then slowly cooled to 680°C and finally water quenched to room temperature. After overaging at 240°C, the samples were obtained with high mechanical properties. The tensile strength, yield strength and elongation are 1223MPa, 605MPa and 9.2%, respectively.

Study on Middle Annealing Process of Cu-Ag Alloy Applied to Motor Commuter

2015 ◽  
Vol 727-728 ◽  
pp. 248-252
Author(s):  
Li Jun Peng ◽  
Zhen Yang ◽  
Ji Miao Ma ◽  
He Feng Yuan ◽  
Feng Liu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Annealing Treatment ◽  
Annealing Process ◽  
Recrystallization Temperature

The tensile strength, elognation and microstructure of alloy are respectively tested and observed after annealing treatment. The results show that the working rate the larger, the initial recrystallization temperature the lesser. The proper middle annealing process of Cu-Ag alloy with 80% deformation is 405°C×5h.

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