Effects of Forging and Heat Treatment on Microstructure and Properties of High Boron White Cast Iron

2010 ◽  
Vol 457 ◽  
pp. 225-230 ◽  
Author(s):  
Jian Jun Zhang ◽  
Yi Min Gao ◽  
Jian Dong Xing ◽  
Sheng Qiang Ma ◽  
Ye Fei Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
Brittle Fracture ◽  
Ductile Fracture ◽  
White Cast Iron ◽  
Fracture Morphology ◽  
Combined Process ◽  
Microstructure And Properties ◽  
High Boron ◽  
Morphology Changes

The effects of forging and heat treatment on microstructure and properties of high boron white cast iron were investigated in this paper. The results show that forging breaks up boride network and makes broken boride particles uniformly distributed in matrix. During subsequent heat treatment, spheroidized boride is able to be obtained. The hardness of high boron white cast iron increases slightly (from 51.4 HRC to 54.7 HRC) while the toughness increases obviously (from 5 J/cm2 to 107 J/cm2) by combined process of forging and heat treatment. Fracture morphology changes from brittle fracture to ductile fracture.

Microstructure and Properties of Isothermally Quenched High Boron White Cast Iron

2010 ◽  
Vol 457 ◽  
pp. 207-212
Author(s):  
Jian Jun Zhang ◽  
Yi Min Gao ◽  
Jian Dong Xing ◽  
Sheng Qiang Ma ◽  
Wan Qin Yan ◽  
...  
Keyword(s):  
Cast Iron ◽  
White Cast Iron ◽  
Fracture Morphology ◽  
Lower Bainite ◽  
Isothermal Quenching ◽  
Microstructure And Properties ◽  
The Matrix ◽  
High Boron ◽  
Matrix Transforms ◽  
Cast Condition

Microstructure and properties of isothermally quenched high boron white cast iron were investigated in this paper. The results show that the microstructure of high boron white cast iron is mainly composed of many continuous and netlike eutectic borides, pearlite and ferrite under as-cast condition. The microhardness of Fe2B ranges in 1200-1600HV whose value seems to approximate that of (Fe,Cr)7C3–type carbide (HV1200~1800) in high chromium white cast iron. After isothermal quenching, the matrix transforms into lower bainite in which carbide precipitations are arranged in parallel rows at an angle of 60 deg to the long axis of the plates, but the morphology of boride remains nearly unchanged compared with its as-cast condition. Moreover, precipitation particles with the size of about 1~4 μm can be found in the matrix of isothermally quenched high boron white cast iron. Impact fracture morphology of isothermally quenched high boron white cast iron indicates that fracture propagated more easily through boride/matrix interface than through matrix.

Effect of Chromium on Microstructure and Properties of High Boron White Cast Iron

2008 ◽  
Vol 39 (3) ◽  
pp. 636-641 ◽  
Author(s):  
Zhongli Liu ◽  
Xiang Chen ◽  
Yanxiang Li ◽  
Kaihua Hu
Keyword(s):  
Cast Iron ◽  
White Cast Iron ◽  
Microstructure And Properties ◽  
High Boron

Study of the durability of the working body the dryer

2020 ◽  
pp. 56-60
Author(s):  
A. P. Chernysh
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Iron ◽  
White Cast Iron ◽  
Low Cost ◽  
Functional Surface ◽  
Wear Coatings

In this article, the plant for heat treatment of grain material, namely perfo-rated spiral operating part, developed by the authors was chosen as the object of improving the wear resistance. The research was conducted in the laboratory of the Technology of Metals and Machinery Repair Department of Kemerovo State Agricultural Institute. The aim of the research is to select the most appropriate method of hardening the functional surface of perforated spiral operating part with the use of low-cost anti-wear coatings. The basis for choosing the method of surfacing the coating was the use of a method of forming the technological repair units (TRU), which allowed electric spark treatment with unalloyed white cast iron.

scholarly journals Effect of Laser Heat Treatment on the Microstructure and Properties of Alloy 800H

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 379 ◽  
Author(s):  
Wei Zhang ◽  
Tao Jiang ◽  
Jing Li ◽  
Liqiang Liu
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Fracture Morphology ◽  
Elemental Content ◽  
Laser Heat Treatment ◽  
Alloy 800H ◽  
X Ray ◽  
Microstructure And Properties ◽  
Fracture Specimen ◽  
Laser Heat

The effects of laser heat treatment on the microstructure and properties of alloy 800H were investigated. The fracture morphology, elemental changes, and phase composition of the specimens were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffractometry (XRD). The results show that the long-lasting life of the specimen after laser heat treatment increased by 28.6%, and the elongation after fracture increased by 20.7%. The macroscopic morphology of the fracture specimen exhibited obvious ductile fracture morphology, and the changes in the elemental content and grain size significantly affected the ductility and toughness of the alloy. This study has certain guiding significance for the optimization of the heat treatment process of this type of alloy.

scholarly journals Effect of Heat Treatment on Microstructure and Properties of Semi-solid Chromium Cast Iron

2004 ◽  
Vol 45 (3) ◽  
pp. 880-887 ◽  
Author(s):  
Nuchthana Poolthong ◽  
Hiroyuki Nomura ◽  
Mitsuharu Takita
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
Microstructure And Properties ◽  
Semi Solid ◽  
Chromium Cast Iron
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