Effects of phosphorous addition on mechanical properties and retained austenite stability of 0.15C−1.5Mn−1.5Al TRIP-aided cold rolled steels

Jing, Cainian; Suh, Dong‐Woo; Oh, Chang Woo; Wang, Zuocheng; Kim, Sung-Joon

doi:10.1007/bf03027817

Cited by 41 publications

(23 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover other elements such as C and Mn could be solutionized into austenite and may enhance the formation of RA. [26][27][28] This is the reason that the 3MCV steel that contains Cr shows a higher volume fraction of GB and MA than the 3MV steel (Table II). According to the repulsive interaction working between Cr and Mo atoms in steels, fine structures can be obtained by the addition of both Mo and Cr as AF and GB are homogeneously dispersed.…”

Section: Discussionmentioning

confidence: 95%

“…The grains become refined and the strength is considerably enhanced. [24][25][26][27][28] The 3MCV and 3MV steels have finer and more homogeneously dispersed GB; thus, they have finer grains overall than the other two steels. The effects of the alloying elements can be summarized as follows.…”

Section: Discussionmentioning

confidence: 99%

“…These steels were largely composed of acicular ferrite (AF) together with granular bainite (GB), martensite (M), and martensite-austenite (MA) constituents, and retained austenite (RA). [22][23][24][25][26][27][28][29] The AF is an acicular microstructure formed inside austenite grains and contains MA constituents at irregularly shaped grain boundaries. The GB contains equiaxed, island-shaped MA constituents and has well-developed substructures inside.…”

Section: A Microstructurementioning

confidence: 99%

See 2 more Smart Citations

Effects of Mo, Cr, and V Additions on Tensile and Charpy Impact Properties of API X80 Pipeline Steels

Han

Shin

Seo

et al. 2009

Metall Mater Trans A

View full text Add to dashboard Cite

In this study, four API X80 pipeline steels were fabricated by varying Mo, Cr, and V additions, and their microstructures and crystallographic orientations were analyzed to investigate the effects of their alloying compositions on tensile properties and Charpy impact properties. Because additions of Mo and V promoted the formation of fine acicular ferrite (AF) and granular bainite (GB) while prohibiting the formation of coarse GB, they increased the strength and upper-shelf energy (USE) and decreased the energy transition temperature (ETT). The addition of Cr promoted the formation of coarse GB and hard secondary phases, thereby leading to an increased effective grain size, ETT, and strength, and a decreased USE. The addition of V resulted in a higher strength, a higher USE, a smaller effective grain size, and a lower ETT, because it promoted the formation of fine and homogeneous of AF and GB. The steel that contains 0.3 wt pct Mo and 0.06 wt pct V without Cr had the highest USE and the lowest ETT, because its microstructure was composed of fine AF and GB while its maintained excellent tensile properties.

show abstract

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: A Microstructurementioning

confidence: 99%

See 1 more Smart Citation

Effects of Mo, Cr, and V Additions on Tensile and Charpy Impact Properties of API X80 Pipeline Steels

Han

Shin

Seo

et al. 2009

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5] Strain-induced martensitic transformation of metastable austenite plays a major role in improving the mechanical balance (tensile strength 9 elongation), allowing TRIP steel to be actively applied in the automotive industry. Currently, the tensile strength of commercially produced TRIP steel reaches approximately 1000 MPa.…”

Section: Transformation-induced-plasticitymentioning

confidence: 99%

Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon, Manganese Transformation-Induced-Plasticity Steel

Suh

Park

Lee

et al. 2009

Metall Mater Trans A

Self Cite

247

106

View full text Add to dashboard Cite

Microstructural design with an Al addition is suggested for low-carbon, manganese transformation-induced-plasticity (Mn TRIP) steel for application in the continuous-annealing process. With an Al content of 1 mass pct, the competition between the recrystallization of the coldrolled microstructure and the austenite formation cannot be avoided during intercritical annealing, and the recrystallization of the deformed matrix does not proceed effectively. The addition of 3 mass pct Al, however, allows nearly complete recrystallization of the deformed microstructure by providing a dual-phase cold-rolled structure consisting of ferrite and martensite and by suppressing excessive austenite formation at a higher annealing temperature. An optimized annealing condition results in the room-temperature stability of the intercritical austenite in Mn TRIP steel containing 3 mass pct Al, permitting persistent transformation to martensite during tensile deformation. The alloy presents an excellent strength-ductility balance combining a tensile strength of approximately 1 GPa with a total elongation over 25 pct, which is comparable to that of Mn TRIP steel subjected to batch-type annealing.

show abstract

“…19) In order to reduce errors in the data interpretation, a regression analysis for absorbed impact energy vs. test temperature was conducted with a hyperbolic tangent curve fitting method. 20,21) Based on the regression analysis data, the energy transition temperature (ETT) which corresponds to the average value of upper shelf energy (USE) and lower shelf energy (LSE) was determined.…”

Section: Tensile and Charpy Impact Testsmentioning

confidence: 99%

Effects of Complex Oxides on Charpy Impact Properties of Heat Affected Zones of Two API X70 Linepipe Steels

Shin

Kang

et al. 2009

ISIJ Int.

View full text Add to dashboard Cite

Fig. 11. SEM micrographs of the cross-sectional area beneath the cleavage fracture surface of the Charpy impact specimens fractured at Ϫ20°C for the (a) S0-30, (b) S1-30, (c) S1-50, and (d) S1-100 steel HAZs, showing the crack propagation path. Fractured surfaces were coated by Ni.enhancing the HAZ toughness. By using the oxide metallurgy in which AFs are nucleated inhomogeneously inside austenite grains by forming fine complex oxides in linepipe steels as in the present study, linepipe steels with excellent Charpy impact properties in the HAZ can be fabricated. This oxide metallurgy technology can be applied to grain refinement by inhomogeneous nucleation when a high level of deformation cannot be imposed due to the limited rolling reduction ratio as in the case of thick high-strength steel plates. It can also be applied to the development of high-strength steel plates with excellent welding properties by controlling the HAZ microstructures. ConclusionsIn the present study, complex oxides were formed inside API X70 linepipe steels, and effects of these oxides on HAZ microstructures and Charpy impact properties were investigated.(1) Oxides present in API X70 linepipe steels were sized about 2 mm, and had characteristics of complex oxides composed of various elements. The S1 steel containing more Al, Ti, and Mg showed higher volume fraction of oxides than the S0 steel.(2) The HAZ microstructures of the S0 steel simulated with the heat input of 30 kJ/cm were composed of bainite, but the S1 steel HAZ contained 94 vol% of AF, together with a small amount of bainite. Thus, the absorbed energy of the S1 steel HAZ at Ϫ20°C and 0°C was five to eight times higher than that of the S0 steel HAZ.(3) When the weld simulation test was conducted with increased heat input of 50 kJ/cm and 100 kJ/cm, the absorbed energies at Ϫ20°C and 0°C of the S1 steel HAZs decreased down because of the increased amount of bainite as the cooling rate became slower.(4) In the S1 steel HAZs in which the AGS was relatively large (91 mm) and a number of complex oxides were contained, complex oxides worked as AF nucleation sites, thereby promoting the active formation of AF in the HAZ and improving Charpy impact properties. AcknowledgementThis work was supported by the National Research Lab-

show abstract

Effects of phosphorous addition on mechanical properties and retained austenite stability of 0.15C−1.5Mn−1.5Al TRIP-aided cold rolled steels

Cited by 41 publications

References 11 publications

Effects of Mo, Cr, and V Additions on Tensile and Charpy Impact Properties of API X80 Pipeline Steels

Effects of Mo, Cr, and V Additions on Tensile and Charpy Impact Properties of API X80 Pipeline Steels

Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon, Manganese Transformation-Induced-Plasticity Steel

Effects of Complex Oxides on Charpy Impact Properties of Heat Affected Zones of Two API X70 Linepipe Steels

Contact Info

Product

Resources

About