Relationship Between Solidification Microstructure and Hot Cracking Susceptibility for Continuous Casting of Low-Carbon and High-Strength Low-Alloyed Steels: A Phase-Field Study

There is renewed interest in the investigation of austenite formation due to the development and increased use of advanced high strength steels for automotive applications. Intercritical annealing is an essential processing step for cold rolled and coated steel products with multi-phase microstructures. During intercritical annealing the initial ferrite-pearlite microstructure transforms partially to austenite. Models for the austenite formation are critical to predict the austenite fraction as a function of the thermal cycle thereby facilitating the design and control of robust processing paths. Modelling the austenite formation is challenging because of the morphological complexity of this transformation. Phase field models are a powerful tool to describe the evolution of microstructures with complex morphologies, e.g. formation of finger-type features during austenite formation. The present paper gives an overview of model approaches for the austenite formation. Phase field simulations are presented for two scenarios: (i) austenite formation from a fully pearlitic structure with a lamellar arrangement of carbide aggregates and (ii) austenite formation from ferrite-pearlite microstructures. Simulation results are compared with experimental observations for pearlitic steels. The challenges are delineated for the development of austenite formation models with predictive capabilities.

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ASTM A710

Alloy Digest ◽

10.31399/asm.ad.sa0446 ◽

1990 ◽

Vol 39 (4) ◽

Keyword(s):

Fracture Toughness ◽

Tensile Properties ◽

Precipitation Hardening ◽

Steel Plate ◽

High Strength ◽

Heat Treating ◽

Low Carbon ◽

Bethlehem Steel Corporation ◽

Strength Alloy ◽

Carbon Precipitation

Abstract ASTM A710 is a low-carbon, precipitation hardening high-strength alloy steel plate. It is well suited to critical applications. This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on heat treating and joining. Filing Code: SA-446. Producer or source: Bethlehem Steel Corporation.

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MITTAL DI-FORM T700, HF80Y100T

Alloy Digest ◽

10.31399/asm.ad.sa0561 ◽

2007 ◽

Vol 56 (2) ◽

Keyword(s):

Automotive Industry ◽

High Strength ◽

Martensite Phase ◽

Carbon Steels ◽

Ferrite Phase ◽

Dual Phase ◽

Low Carbon ◽

Advanced High Strength Steel ◽

Dp Steels ◽

Soft Ferrite

Abstract MITTAL DI-FORM T700 and HF80Y100T are low-carbon steels with a manganese and silicon composition. Dual-phase (DP) steels are one of the important advanced high-strength steel (AHSS) products developed for the automotive industry. Their microstructure typically consists of a soft ferrite phase with dispersed islands of a hard martensite phase. The martensite phase is substantially stronger than the ferrite phase. The DI-FORM grades exhibit low yield-to-tensile strengths, and the numeric designation in the name corresponds to the tensile strength. This datasheet provides information on microstructure and tensile properties as well as deformation and fatigue. It also includes information on forming. Filing Code: SA-561. Producer or source: Mittal Steel USA Flat Products.

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MITTAL DI-FORM T590, T600

Alloy Digest ◽

10.31399/asm.ad.sa0558 ◽

2007 ◽

Vol 56 (1) ◽

Keyword(s):

Tensile Strength ◽

Automotive Industry ◽

High Strength ◽

Martensite Phase ◽

Ferrite Phase ◽

Dual Phase ◽

Bend Strength ◽

Low Carbon ◽

Advanced High Strength Steel ◽

Soft Ferrite

Abstract MITTAL DI-FORM T590 and T600 are low-carbon dual-phase steels containing manganese and silicon. Dual-phase (DP) steels are important advanced high-strength steel (AHSS) products developed for the automotive industry. Their microstructure typically consists of a soft ferrite phase with dispersed islands of a hard martensite phase. The martensite phase is substantially stronger than the ferrite phase. The DI-FORM grades exhibit low yield-to-tensile strength ratios. The numeric designation in the grade name corresponds to the tensile strength in MPa. This datasheet provides information on microstructure, tensile properties, and bend strength as well as fatigue. It also includes information on forming. Filing Code: SA-558. Producer or source: Mittal Steel USA Flat Products.

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BETHSTAR 60

Alloy Digest ◽

10.31399/asm.ad.sa0421 ◽

1986 ◽

Vol 35 (8) ◽

Keyword(s):

Fracture Toughness ◽

Yield Strength ◽

Steel Plate ◽

High Stress ◽

High Strength ◽

Heat Treating ◽

Low Carbon ◽

Bethlehem Steel Corporation ◽

Low Sulfur ◽

Minimum Yield

Abstract BethStar 60 steel plate is a high-strength product with a 60,000 psi minimum yield strength. It contains low carbon and low sulfur and has outstanding toughness, weldability and formability. It provides the design engineer with a an economical high-strength low-alloy (HSLA) grade that can be fabricated readily. Applications include weight-sensitive components subject to high stress such as frames for large off-highway haulers. This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: SA-421. Producer or source: Bethlehem Steel Corporation.

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SPARTAN II

Alloy Digest ◽

10.31399/asm.ad.sa0738 ◽

2016 ◽

Vol 65 (1) ◽

Keyword(s):

Yield Strength ◽

Physical Properties ◽

Tensile Properties ◽

High Strength ◽

Low Carbon ◽

Copper Precipitation ◽

High Toughness ◽

The Family ◽

Alloy Steels ◽

Minimum Yield

Abstract SPARTAN II (HSLA-100) is one of the family of Spartan high strength (>690 MPa, or >100 ksi, minimum yield strength), high toughness, improved weldability steels, which are alternatives to traditional quenched and tempered alloy steels. The Spartan family of steels are low carbon, copper precipitation hardened steels. Spartan II has improved yield strength compared to Spartan I. This datasheet provides information on composition, physical properties, microstructure, tensile properties. It also includes information on forming and joining. Filing Code: SA-738. Producer or source: ArcelorMittal USA.

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ULTRA-FORM 80

Alloy Digest ◽

10.31399/asm.ad.sa0291 ◽

1973 ◽

Vol 22 (7) ◽

Keyword(s):

High Strength ◽

Heat Treating ◽

Low Carbon ◽

Low Alloy Steel ◽

Bethlehem Steel Corporation ◽

Temperature Performance ◽

Inclusion Shape ◽

Ferrite Grain Size ◽

Minimum Yield ◽

Shape And Size

Abstract Ultra-Form 80 is a low-alloy steel developed for its combination of high strength, good formability, fatigue resistance, toughness and weldability. It has a minimum yield strength of 80,000 psi and is characterized by its low carbon and alloy content, very fine ferrite grain size, and controlled inclusion shape and size. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: SA-291. Producer or source: Bethlehem Steel Corporation.

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