Effect of zirconium addition on the austenite grain coarsening behavior and mechanical properties of 900 MPa low carbon bainite steel

2008 ◽  
Vol 15 (6) ◽  
pp. 688-695 ◽  
Author(s):  
Jia Guo ◽  
Aimin Guo ◽  
Hui Guo ◽  
Ying Wang ◽  
Jing Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Carbon ◽  
Grain Coarsening ◽  
Austenite Grain ◽  
Coarsening Behavior ◽  
Bainite Steel ◽  
Low Carbon Bainite ◽  
Zirconium Addition

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.

Effects of Chromium and Nickel Additions on the Austenite Grain Coarsening of Low Carbon Structural Steels Containing 0.13% C

2016 ◽  
Vol 860 ◽  
pp. 152-157 ◽  
Author(s):  
Mohiuddin Ahmed ◽  
Md Mohar Ali Bepari ◽  
Roisul Hasan Galib
Keyword(s):  
Grain Size ◽  
Chromium Carbide ◽  
Structural Steels ◽  
Low Carbon ◽  
Austenite Grain Size ◽  
Grain Coarsening ◽  
Austenite Grain ◽  
Nickel Particles ◽  
Coarsening Behavior ◽  
Increasing Temperature

The austenite grain coarsening behavior of low carbon (0.13% C) structural steels containing chromium and nickel singly or in combination were studied by heating the steels at successive high temperature in the austenite zone in the temperature range of 900-1100°C with an interval of 50°C. The carburizing technique has been adopted to reveal the prior austenite grain boundaries and mean linear intercept method was used to measure the austenite grain size.It was found that on heating the undissolved particles of chromium carbide, Cr2C refine the austenite grain size at temperature below 1000°C, but the effect decreases with increasing temperature. Nickel does not produce any austenite grain refinement. In the presence of nickel particles of chromium carbide are less effective than chromium carbide particles in the absence of nickel in the refinement of austenite grain size.

The Corrosion Behavior of a Low Carbon Bainite Steel in Simulated Atmosphere Environment Containing Chloride and/or Sulfide

2012 ◽  
Vol 217-219 ◽  
pp. 419-427
Author(s):  
Lei Cui ◽  
Shan Wu Yang ◽  
Jun Hua Kong
Keyword(s):  
Steel Corrosion ◽  
Weathering Steel ◽  
Low Carbon ◽  
Three Solutions ◽  
Corrosion Rates ◽  
Bainite Steel ◽  
Selective Corrosion ◽  
Corrosion Behaviors ◽  
Low Carbon Bainite ◽  
Atmosphere Environment

The corrosion behaviors of a low carbon bainite steel in three atmosphere environments simulated by corresponding solutions were investigated in this accelerated test. It is found that the corrosion rate of the low carbon bainite steel is lower than that of the commercial weathering steel 09CuPCrNi in all the three solutions. The corrosion rates of the bainite steel in the three solutions are also different, which is most serious in the solution containing both chloride and sulfide. There is no serious selective corrosion, for the corrosion has little effect on the mechanical property of the bainite steel. Corrosion rates are relation to the amount of Cu and Cr enrichment in rust layers, which are well corresponding to the specific surface area values of corrosion products. Inhibit effect can be found in the solution containing both chloride and sulfide.

Electron Microscope studies of the microstructures in as-quenched and aged HSLA-100 production steels and correlation with mechanical properties

1991 ◽  
Vol 49 ◽  
pp. 582-583
Author(s):  
A.G. Fox ◽  
V.R. Mattes ◽  
S. Mikalac ◽  
M.G. Vassilaros
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Low Carbon ◽  
Austenite Grain Size ◽  
Solid Solution Strengthening ◽  
Austenite Grain ◽  
Microstructure And Mechanical Properties ◽  
Hsla Steels ◽  
Carbonitride Precipitation ◽  
Strength And Toughness

Because of their excellent weldability, high strength low alloy (HSLA) ultra low carbon bainitic (ULCB) steels are finding increasing applications in ship and submarine construction. In order to achieve the required strength and toughness in ULCB HSLA steels it is necessary to control chemical composition and thermo-mechanical processing very carefully so that the desired microstructure and mechanical properties can be achieved. For instance HSLA 100 ULCB steel (nominal yield strength 100 ksi) used by the U.S. Navy in shipbuilding applications can derive its strength and toughness from the following sources:- (1) solid solution strengthening (2) small prior austenite grain size derived from niobium carbonitride precipitation at austenite grain boundaries (3) dislocation substructure and (4) from copper precipitates (in aged alloys). The object of the present work is to correlate the microstructure and mechanical properties of production batches of HSLA 100 in the quenched and aged conditions. Because many of the salient features of these microstructures are submicron in size it was found necessary to use SEM and TEM.

Crystallographic Features of Low-Carbon Bainite Formed under Non-Isothermal Conditions

2013 ◽  
Vol 762 ◽  
pp. 110-115 ◽  
Author(s):  
S.N. Panpurin ◽  
Nikolay Y. Zolotorevsky ◽  
Yuri F. Titovets ◽  
A.A. Zisman ◽  
E.I. Khlusova
Keyword(s):  
Cooling Rate ◽  
Electron Backscatter Diffraction ◽  
Bainitic Ferrite ◽  
Low Carbon ◽  
Austenite Grain Size ◽  
Orientation Data ◽  
Austenite Grain ◽  
Low Carbon Bainite ◽  
Backscatter Diffraction ◽  
Parent Austenite

The effects of cooling rate and austenite structure on bainite formation was investigated by means of electron backscatter diffraction analysis and processing of obtained orientation data. Variant pairing tendency of bainitic ferrite was found to depend on the austenite grain size, austenite plastic deformation and cooling rate. In the bainite formed at low cooling rate the variant pairs having the same Bain axis correspondence are more frequent, while at high cooling rate the variant pairs having the same parallel correspondence of close-packed planes are formed side by side preferably. At the same time, these features are influenced significantly by structural state of parent austenite.

Effect of Niobium Additions on Austenite Grain Coarsening Behavior of GCr15 Bearing Steel

2015 ◽  
Vol 817 ◽  
pp. 121-126 ◽  
Author(s):  
Xiang Liu ◽  
Fan Zhao ◽  
Zheng Qiang Dong ◽  
Chao Lei Zhang ◽  
Yu Shan Kou ◽  
...  
Keyword(s):  
Grain Growth ◽  
Bearing Steel ◽  
Grain Coarsening ◽  
Soaking Time ◽  
Experimental Steel ◽  
Austenite Grain ◽  
Gcr15 Bearing Steel ◽  
Coarsening Behavior ◽  
Growth Equations ◽  
Soaking Temperature

The effect of 0.018% niobium additions on austenite grain coarsening behavior of GCr15 bearing steel was studied. Results indicate that the coarsening temperatures of No.1 and the No.2 experimental steel were 950°C and 1100°C. The austenite grain coarsening temperature was increased by 150°C by the addition of 0.018% Nb in bearing steel. The grain growth equations of two experimental steels at different soaking temperatures from 850°C to 1250°C with the soaking time of 30 min are as follows: the equation of No.1 steel is D1=1.85×105·exp (-6.57×104/RT); the equations of No.2 steel below and above 1100°C is D2=5.08×102·exp (-2.49×104/RT) and D2=1.06×108·exp (-1.31×105/RT), respectively. The grain growth equations of two experimental steels at different soaking time from 15 to 120 min with the soaking temperature of 840°C are as follows: the equation of No.1 steel is D1=4.83×10-2·t0.72 while that of No.2 steel is D2=1.25·t0.18.

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