The Effect of Cooling Conditions on the Evolution of Non-metallic Inclusions in High Manganese TWIP Steels

2016 ◽  
Vol 47 (2) ◽  
pp. 1378-1389 ◽  
Author(s):  
Yu-Nan Wang ◽  
Jian Yang ◽  
Xiu-Ling Xin ◽  
Rui-Zhi Wang ◽  
Long-Yun Xu
Keyword(s):  
High Manganese ◽  
Cooling Conditions ◽  
Metallic Inclusions ◽  
Twip Steels

Effects of Non-metallic Inclusions on Hot Ductility of High Manganese TWIP Steels Containing Different Aluminum Contents

2016 ◽  
Vol 47 (3) ◽  
pp. 1697-1712 ◽  
Author(s):  
Yu-Nan Wang ◽  
Jian Yang ◽  
Rui-Zhi Wang ◽  
Xiu-Ling Xin ◽  
Long-Yun Xu
Keyword(s):  
Hot Ductility ◽  
High Manganese ◽  
Metallic Inclusions ◽  
Twip Steels

Fatigue Behavior of High Manganese TWIP Steels and of Low Alloy Q&P Steels for Car-Body Applications

2014 ◽  
Vol 783-786 ◽  
pp. 713-720
Author(s):  
Paolo Matteis ◽  
Giorgio Scavino ◽  
R. Sesana ◽  
F. D’Aiuto ◽  
Donato Firrao
Keyword(s):  
Heat Treatment ◽  
Room Temperature ◽  
Fatigue Behavior ◽  
Austenitic Steels ◽  
Fracture Mechanisms ◽  
High Manganese ◽  
Cold Forming ◽  
Austenitic Structure ◽  
Plasticity Effect ◽  
Twip Steels

The automotive TWIP steels are high-Mn austenitic steels, with a relevant C content, which exhibit a promising combination of strength and toughness, arising from the ductile austenitic structure, which is strengthened by C, and from the TWIP (TWinning Induced Plasticity) effect. The microstructure of the low-alloy Q&P steels consists of martensite and austenite and is obtained by the Quenching and Partitioning (Q&P) heat treatment, which consists of: austenitizing; quenching to the Tqtemperature, comprised between Msand Mf; soaking at the Tppartitioning temperature (Tpbeing equal to or slightly higher than Tq) to allow carbon to diffuse from martensite to austenite; and quenching to room temperature. The fatigue behavior of these steels is examined both in the as-fabricated condition and after pre-straining and welding operations, which are representative of the cold forming and assembling operations performed to fabricate the car-bodies. Moreover, the microscopic fracture mechanisms are assessed by means of fractographic examinations.

Effects of Al addition on deformation and fracture mechanisms in two high manganese TWIP steels

2011 ◽  
Vol 528 (6) ◽  
pp. 2922-2928 ◽  
Author(s):  
Kwang-Geun Chin ◽  
Chung-Yun Kang ◽  
Sang Yong Shin ◽  
Seokmin. Hong ◽  
Sunghak Lee ◽  
...  
Keyword(s):  
Fracture Mechanisms ◽  
High Manganese ◽  
Deformation And Fracture ◽  
Twip Steels ◽  
Al Addition

scholarly journals Experimental Study on the Formation of Non-Metallic Inclusions Acting as Nuclei for Acicular Ferrite in HSLA Steels through Specific Deoxidation Practice and Defined Cooling Conditions

2014 ◽  
Vol 783-786 ◽  
pp. 1079-1084 ◽  
Author(s):  
Susanne K. Michelic ◽  
Denise Loder ◽  
Gregor Arth ◽  
Christian Bernhard
Keyword(s):  
Experimental Study ◽  
Chemical Composition ◽  
Optical Microscopy ◽  
Acicular Ferrite ◽  
Eds Analysis ◽  
Cooling Conditions ◽  
Hsla Steels ◽  
Metallic Inclusions ◽  
Ti Content ◽  
Deoxidation Practice

Specific types of non-metallic inclusions are known to act as heterogeneous nuclei for the formation of acicular ferrite, which provides excellent toughness. By increasing the amount of acicular ferrite in the microstructure, the properties of HSLA steels can be optimized significantly.Although the formation of acicular ferrite caused by heat treatments (thermomechanical treatments or welding) is quite well described in literature, there is less information to find about the formation of acicular ferrite immediately out of the liquid melt. Within the present study experiments on laboratory scale are carried out simulating the influence of cooling conditions and Ti-content on size, chemical composition and morphology of non-metallic inclusions and consequently on the amount of acicular ferrite. All experiments were carried out with a dipping test simulator enabling very well controllable cooling conditions. Optical microscopy in combination with special etching methods as well as SEM/EDS-analysis was used for microstructure and inclusion characterization.

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