Research on Simulating of Controlled Rolling and Controlled Cooling Process for Mo Micro-Alloy Steel

2008 ◽  
Vol 575-578 ◽  
pp. 595-599
Author(s):  
Gui Yan Li ◽  
Bao Chun Zhao ◽  
Zao Fu Pang ◽  
Yong Hao Liu ◽  
Hui Xia Ma
Keyword(s):  
Mechanical Property ◽  
Alloy Steel ◽  
Volume Fraction ◽  
Controlled Rolling ◽  
Rolling Temperature ◽  
Technological Parameters ◽  
Controlled Cooling ◽  
Transmission Electron ◽  
Two Stages ◽  
Microstructure And Mechanical Property

The transformation production and recrystallization for Mo Micro-alloy Steel had been carried out on the Gleeble-3800 thermo-mechanical simulator. Based on the schedule, TMCP was applied to two stages multi-pass hot rolling experiments and the influences of the technological parameters on microstructure and mechanical property were analyzed. The results showed that the microstructure, precipitation and mechanical property of Mo Micro-alloy steel were strongly affected by the start-rolling temperature, the end-rolling temperature, the cooling rate and the relaxation time. The appropriate parameters were used and the ideal volume fraction of the acicular ferrite was observed by using metallographic microscope and transmission electron microscope(TEM).

Effect of C on Microstructure and Mechanical Property of Hot Rolled DP Steel

2012 ◽  
Vol 557-559 ◽  
pp. 1387-1390
Author(s):  
Le Yu Zhou ◽  
Dan Zhang ◽  
Ya Zheng Liu ◽  
Long Jiao Li
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Volume Fraction ◽  
High Strength ◽  
Controlled Rolling ◽  
Elongation Ratio ◽  
Controlled Cooling ◽  
Dp Steel ◽  
Hot Rolled ◽  
Microstructure And Mechanical Property

Two kinds of C-Si-Mn-Cr-Mo-Nb tested steels with different C content were disigned, and controlled rolling and controlled cooling experiment of tested steels have been carried out in lab to analyze the effect of C on microstructure and mechanical property of high strength hot rolled dual phase steel. It is shown that two kinds of tested steels obtained ferrite and martensite microstructure under controlled rolling and step cooling process. With the increase of C content from 0.032wt% to 0.064wt%, ferrite grain size refines from 9.8μm to 5.0μm, width of martensite colony reduces from 10μm to 5.8μm, and martensite volume fraction increases from 11% to 25%. Yielding strength of high C tested steel is higher than that of low C steel by 55MPa, and amplification of tensile strength is about 155MPa. Elongation ratio decreases about 6.4%. Increasing of yielding strength is determined by strengthening of ferrite grain refining. The amplification of tensile strength is effect by volume fraction and refining of strengthening phase.

Characteristics of Deformation-Induced Transformation in Steel 2.25Cr1Mo

2008 ◽  
Vol 385-387 ◽  
pp. 509-512
Author(s):  
Qing Fen Li ◽  
Hong Bin Chen
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Alloy Steel ◽  
Volume Fraction ◽  
Controlled Rolling ◽  
Low Alloy Steel ◽  
Cooling Process ◽  
Controlled Cooling ◽  
Steel Microstructure ◽  
Steel Strength

Characteristics of deformation-induced transformation (DIT) in the refractory low alloy steel 2.25Cr1Mo were experimentally studied. Effect of different controlled-rolling and controlled-cooling process on the steel microstructure and mechanical properties were investigated and the mechanism was discussed. Results show that the grain size and the ferrite volume fraction were obviously affected by the rolling and cooling processes. Proper DIT technique may significantly accelerate the transformation of austenite to ferrite in the steel and improve the steel strength.

Microstructure Characteristics in Continuous Cooling Transformation of an Nb Microalloyed Steel

2011 ◽  
Vol 228-229 ◽  
pp. 72-76
Author(s):  
J. H. Yang ◽  
Q. Y. Liu
Keyword(s):  
Microalloyed Steel ◽  
Controlled Rolling ◽  
Controlled Cooling ◽  
Cooling Rates ◽  
Continuous Cooling Transformation ◽  
Microstructure Characteristics ◽  
Continuous Cooling ◽  
Nb Content ◽  
Nb Microalloyed Steel ◽  
Two Stages

Deformation dilatometry has been used to simulate controlled hot rolling followed by controlled cooling of a Nb microalloyed pipeline steels, the microstructure and transformation characteristics in the steel and the effect of deformation on transformation are studied. According to the results of both dilatometry measurements and microstructure observations, the continuous cooling transformation curves (CCT) of the tested steels are constructed. The results show that Nb content and deformation enhance the formation of acicular ferrite; the microstructure of the steel range from PF, QF to AF with increasing of cooling rates from 0.5 to 50°C /s in a two stages controlled rolling and the microstructure revolution is sensitive to cooling rates when it is lower than 5°C /s, however, when the cooling rate increasing further, the microstructure didn’t change very much but M/A constituents in matrix is refined and dispersed.

Relationship Between Microstructure and Hardness of ZrN/TiN Multi-Layers with Various Bilayer Thicknesses

2010 ◽  
Vol 63 ◽  
pp. 392-395
Author(s):  
Yoshifumi Aoi ◽  
Satoru Furuhata ◽  
Hiromi Nakano
Keyword(s):  
Mechanical Property ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Ion Beam ◽  
Ion Beam Sputtering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Beam Sputtering ◽  
Microstructure And Mechanical Property

ZrN/TiN multi-layers were synthesized by ion beam sputtering technique. Microstructure and mechanical property of the ZrN/TiN multi-layers were characterized and the relationships between microstructure and hardness of the ZrN/TiN multi-layers with various bilayer thicknesses and thickness ratios were investigated. The microstructure of multi-layers have been investigated using transmission electron microscope (TEM) and X-ray diffraction (XRD).

Effects of Welding Condition on Microstructure and Mechanical Property of Energy Resistance Welding Alloy Steel Pipes

2011 ◽  
Vol 21 (1) ◽  
pp. 50-55 ◽  
Author(s):  
Kyung-Min Lee ◽  
Dong-Eon Lee ◽  
Sung-Woong Kim ◽  
Byung-Hyun Yoon ◽  
Hee-Jae Kang ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Alloy Steel ◽  
Resistance Welding ◽  
Welding Condition ◽  
Steel Pipes ◽  
Welding Alloy ◽  
Microstructure And Mechanical Property

EFFECT OF DEFORMATION-INDUCED TRANSFORMATION PROCESS ON FERRITE GRAIN SIZE AND VOLUME FRACTION IN STEEL 12CR1MOV

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1197-1202
Author(s):  
QINGFEN LI ◽  
XIUFANG CUI ◽  
HONGBIN CHEN
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Cooling Rate ◽  
Deformation Temperature ◽  
Volume Fraction ◽  
Rolling Process ◽  
Controlled Rolling ◽  
Temperature Deformation ◽  
Controlled Cooling ◽  
Ferrite Grain Size

Effect of deformation induced transformation (DIT) process on ferrite grain size and ferrite transformation volume fraction in the refractory low alloy steel 12 Cr 1 MoV by controlled rolling and controlled cooling technology were experimentally studied. Simulation experiments of hot deformation were carried out with the Gleeble-1500 system. Single-pass and multi-pass hot rolling process with different deformation temperature, deformation reduction, strain rate and cooling rate were performed separately. The ferrite grain size decreased and the ferrite volume fraction increased with decreasing deformation temperature, and the extra-fine ferrite grain about 1.01µm was obtained when the deformation temperature reached 780°C. Higher deformation reduction resulted finer ferrite grain size and higher ferrite volume fraction. Both the ferrite grain size and ferrite volume fraction decreased with increasing strain rate. The ferrite grain size decreased but the ferrite volume fraction didn't change much when the cooling rate increased. The grain size and the ferrite volume fraction were improved more by three-passes than two-passes rolling. The mechanism of grain refinement by DIT was discussed.

A High Strength and Toughness Mg-Y-Ni Alloy with a Long-Period Stacking Ordered Structure

2017 ◽  
Vol 898 ◽  
pp. 172-178 ◽  
Author(s):  
Su Qin Luo ◽  
Ai Tao Tang ◽  
Bin Jiang ◽  
Han Wu Dong ◽  
Wei Wei ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Volume Fraction ◽  
High Strength ◽  
High Volume ◽  
High Volume Fraction ◽  
Ordered Structure ◽  
Long Period ◽  
Lpso Structure ◽  
Ni Alloy ◽  
Microstructure And Mechanical Property

Mg-5Y-3Ni-0.2Zr (wt. %) and Mg-5Y-3Zn-0.2Zr (wt. %) alloys with LPSO structure have been designed and fabricated. The microstructure and mechanical property of both the extruded alloys have been comparatively studied. The results showed that the alloy with enough Ni exhibited higher elongation due to the high volume fraction of LPSO structure with excellent compatible deformation capability. The presence of deformation kinks with high kink angle demonstrated the capability of LPSO structure to accommodate the deformation, which could greatly increase the ductility and the toughness of the alloy.

Sign in / Sign up

Export Citation Format

Share Document