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.

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).

Microstructure and Mechanical Property of 22MnB5 High-Strength Steel

2013 ◽  
Vol 864-867 ◽  
pp. 644-647
Author(s):  
Ao Ran Wei ◽  
Hong Wei Liu ◽  
Jing Fan Chen
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Tensile Strength ◽  
High Strength Steel ◽  
Lath Martensite ◽  
High Strength ◽  
22Mnb5 Steel ◽  
Specific Elongation ◽  
Microstructure And Mechanical Property ◽  
Better Than

We have mental heat treatment for 22MnB5 steel with seven different experimental schemes and have mechanical property test on the seven steels. Then the microstructure and mechanical property of treated steels are studied, and the results show that 300°C is the optimum preservation temperature, at which we can get the optimum specific elongation of 22MnB5 steel. The tensile strength of steel thermal insulated at 300°C for 3 minutes is better than that of steel tempered at 300°C for 3 minutes, while as for specific elongation , the latter one is better. And we can also get homogeneous lath martensite after die quenching. The experiment lays foundations of the actual production process of hot forming.

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.

Effect of Nb on Transformation and Property of C-Si-Mn-Cr-Mo High Strength Hot-Rolled DP Steel

2014 ◽  
Vol 510 ◽  
pp. 110-113
Author(s):  
Le Yu Zhou ◽  
Bo Jiang ◽  
Dan Zhang ◽  
Chao Lei Zhang ◽  
Ya Zheng Liu
Keyword(s):  
Volume Fraction ◽  
High Strength ◽  
Strength Increase ◽  
Medium Temperature ◽  
Dp Steel ◽  
Transformation Rules ◽  
Rolling Experiment ◽  
Coiling Process ◽  
Tensile Strength Increase ◽  
Hot Rolled

Two kinds of C-Si-Mn-Cr-Mo tested steels were used to study the transformation rules and microstructure evolution during thermal mechanical experiment and rolling experiment. Effects of micro alloying element Nb on transformation and propertied were discussed. The result shows that Nb retards ferrite transformation, reduces ferrite volume fraction and refines the ferrite grain size and martensite colony size. After micro-alloying of 0.047wt%Nb, yield strength and tensile strength increase by 145MPa and 135MPa respectively under medium temperature coiling process. YS/TS ratio increases from 0.51 to 0.62, meanwhile, the decrease of elongation is not obvious. The grain refining strengthening and precipitation strengthening of Nb micro-alloying is effective to enhance the strength grade of hot rolled DP steel coiled at medium temperature.

The Microstructure and Formability Study on DP Steel of Lightweight Automobile

2011 ◽  
Vol 704-705 ◽  
pp. 1465-1472
Author(s):  
Jin Wu ◽  
Da Sen Bi ◽  
Liang Chu ◽  
Jian Zhang ◽  
Yun Tao Li
Keyword(s):  
Mechanical Property ◽  
Work Hardening ◽  
High Strength Steel ◽  
High Strength ◽  
Mathematic Model ◽  
Theoretical Research ◽  
Forming Limit ◽  
Strain Hardening Exponent ◽  
Dp Steel ◽  
Better Than

Dual phase (DP) steel is a high strength steel for auto-panel. In this paper, mechanical property, forming ability, baked-hardening and work hardening properties of high strength steel DP450 are studied by experiments, and compared with those of steel MS6000.And theoretical research on predicting the forming limit of steel DP450 by the NADDRG model. The established mathematic model for relativity is of practical usefulness. Experimental results reveal that the yield strength of steel DP450 is about 7.2% lower than the MS6000,and the break strength increases by 18.9%,while the elongation increases by 19%.The strain hardening exponent of steel DP450 are superior to those of MS6000.The results show that mechanical property of high strength steel DP450 is better than that of MS6000,while forming ability of DP450 is not lower than that of MS6000.And baked-hardening and work hardening properties of steel DP450 are better than those of MS6000.The steel sheet DP450 owned a good forming ability.

scholarly journals Tensile Properties and Damping Capacity of Cold-Rolled Fe-20Mn-12Cr-3Ni-3Si Damping Alloy

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5975
Author(s):  
Jae-Hwan Kim ◽  
Jong-Min Jung ◽  
Hyunbo Shim
Keyword(s):  
Tensile Strength ◽  
Cold Rolling ◽  
Tensile Properties ◽  
Volume Fraction ◽  
High Strength ◽  
Damping Capacity ◽  
Austenite Stability ◽  
Ε Martensite ◽  
Cold Rolled ◽  
The Relationship

The tensile properties and damping capacity of cold-rolled Fe–20Mn–12Cr–3Ni–3Si alloys were investigated. The martensitic transformation was identified, including surface relief with a specific orientation and partial intersection. Besides, as the cold rolling degree increased, the volume fraction of ε-martensite increased, whereas α’-martensite started to form at the cold rolling degree of 15% and slightly increased to 6% at the maximum cold rolling degree. This difference may be caused by high austenite stability by adding alloying elements (Mn and Ni). As the cold rolling degree increased, the tensile strength linearly increased, and the elongation decreased due to the fractional increment in the volume of martensite. However, the damping capacity increased until a 30% cold rolling degree was approached, and then decreased. The irregular tendency of the damping capacity was confirmed, depicting that it increased to a specific degree and then decreased as the tensile strength and elongation increased. Concerning the relationship between the tensile properties and the damping capacity, the damping capacity increased and culminated, and then decreased as the tensile properties and elongation increased. The damping capacity in the high-strength area tended to decrease because it is difficult to dissipate vibration energy into thermal energy in alloys with high strength. In the low-strength area, on the other hand, the damping capacity increased as the strength increased since the increased volume fraction of ε-martensite is attributed to the increase in the damping source.

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