Formation of Eutectic Borocarbides in High Boron High Speed Steel during Non‐Equilibrium Crystallization

2018 ◽  
Vol 90 (2) ◽  
pp. 1800284
Author(s):  
Xiangyi Ren ◽  
Hanguang Fu ◽  
Jiandong Xing
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Equilibrium Crystallization ◽  
High Boron ◽  
Non Equilibrium

Phase Diagram Calculation and Analyze on Cast High-Boron High-Speed Steel

2015 ◽  
Vol 25 (2) ◽  
pp. 409-420 ◽  
Author(s):  
Yong-wei Yang ◽  
Han-guang Fu ◽  
Yong-ping Lei ◽  
Kai-ming Wang ◽  
Li-long Zhu ◽  
...  
Keyword(s):  
Phase Diagram ◽  
High Speed ◽  
High Speed Steel ◽  
Phase Diagram Calculation ◽  
High Boron

scholarly journals Non-equilibrium solidification and microsegregation in centrifugally cast high speed steel for rolls

2018 ◽  
Vol 54 (1) ◽  
pp. 59-66 ◽  
Author(s):  
U. Klancnik ◽  
B. Kosec ◽  
P. Mrvar ◽  
J. Medved
Keyword(s):  
Electron Microscopy ◽  
High Speed ◽  
Light And Electron Microscopy ◽  
High Speed Steel ◽  
Scanning Calorimetry ◽  
Centrifugally Cast ◽  
Eutectic Carbides ◽  
Thermo Calc Software ◽  
Equilibrium Solidification ◽  
Non Equilibrium

When regarding as-cast microstructures of highly alloyed metals, microsegregation of alloying elements is a common feature resulting from non-equilibrium conditions during solidification. The aim of this work is to predict the occurrence and severity of microsegregation in highly alloyed, centrifugally cast high speed steel used for rolls. The prediction was performed using thermodynamic Scheil-Gulliver modelling with Thermo-Calc software. The modelled predictions were then compared with differential scanning calorimetry, X-ray diffraction, light and electron microscopy with energy dispersive spectroscopy, all performed on an as-cast roll shell. Results show that chromium, molybdenum and vanadium have the highest tendency to microsegregation. Vanadium tends to form negative microsegregation, while molybdenum and chromium form positive microsegregation. Scanning electron microscopy revealed the presence of complex eutectic carbides, confirming the Scheil-Gulliver non-equilibrium solidification path via two main successive eutectic reactions.

Precipitation behavior of boron-carbide hard phase comprising a new high-boron high-speed steel

2019 ◽  
Vol 6 (10) ◽  
pp. 106516
Author(s):  
Zhentao Yuan ◽  
Chong Xiaoyu ◽  
Sui Yudong ◽  
Yehua Jiang ◽  
Zhang Yannan
Keyword(s):  
Boron Carbide ◽  
High Speed ◽  
High Speed Steel ◽  
Hard Phase ◽  
Precipitation Behavior ◽  
High Boron

Effects of modification on microstructure and properties of Al-bearing high-boron high-speed steel

2018 ◽  
Vol 116 (1) ◽  
pp. 108
Author(s):  
Zhang Yaguang ◽  
Hanguang Fu ◽  
Lin Jian ◽  
Wang Changan ◽  
Lei Yongping
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
High Hardness ◽  
Impact Testing ◽  
Wear Testing ◽  
Microstructure And Properties ◽  
Different Types ◽  
The Matrix ◽  
High Boron

The microstructure of Al-bearing high-boron high speed steel (AB-HSS) contains a large amount of borocarbides, which makes it have high hardness, superior wear resistance and thermal stability. But the borocarbides are coarser and continuously distribute along the grain boundary which seriously destroys the toughness of AB-HSS. In this paper, the microstructure and properties of AB-HSS were regulated by adding modifiers and quenching and tempering heat-treatment. The modifier was RE-Mg, Ti and N elements. The microstructure and properties of AB-HSS were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), the electron probe microanalysis (EPMA), hardness testing, wear testing, and impact testing. The results show that the borocarbides in as-cast AB-HSS are found in intergranular networks showing different degrees of continuity after adding different types of modifiers. The matrix of as-cast AB-HSS all is composed of ferrite, pearlite and martensite, and the borocarbides all consist of M2(B,C) and M7(C,B)3 after adding different types of modifiers. After high-temperature heat treatment, the borocarbides in the microstructure of RE-Mg modification AB-HSS appear as discontinuous networks showing signs of spheroidization and the distribution of the borocarbides is more uniform. The matrix of RE-Mg modification AB-HSS is martensite and the borocarbides consist of M2(B,C), M7(C,B)3 and M23(C,B)6. The hardness of RE-Mg modification AB-HSS reaches 61.7 HRC, and impact toughness increases by 52%, and has excellent comprehensive mechanical properties.

Effect of Quenching Temperature on Microstructure and Properties of Al-Bearing High-Boron High-Speed Steel

2019 ◽  
Vol 72 (12) ◽  
pp. 3107-3116 ◽  
Author(s):  
Xiaoni Liu ◽  
Hanguang Fu ◽  
Yinhu Qu ◽  
Xiaole Cheng ◽  
Changan Wang ◽  
...  
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Quenching Temperature ◽  
Microstructure And Properties ◽  
High Boron

Effect of calcium modification on solidification, heat treatment microstructure and toughness of high boron high speed steel

2018 ◽  
Vol 6 (1) ◽  
pp. 016540
Author(s):  
Xiangyi Ren ◽  
Hanguang Fu ◽  
Jiandong Xing ◽  
Shuli Tang ◽  
Qi Zhang
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
High Boron ◽  
Calcium Modification

Effect of quenching on microstructure and properties of modified Al-bearing high boron high speed steel

2018 ◽  
Vol 60 (6) ◽  
pp. 569-576 ◽  
Author(s):  
Yaguang Zhang ◽  
Hanguang Fu ◽  
Jian Lin ◽  
Yongping Lei ◽  
Shengqiang Ma
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Microstructure And Properties ◽  
High Boron
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