scholarly journals Improvement of abrasive wear resistance of the high chromium cast iron ASTM A-532 through thermal treatment cycles

2016 ◽  
Vol 25 (41) ◽  
pp. 93 ◽  
Author(s):  
Oscar Fabián Higuera-Cobos ◽  
Florina-Diana Dumitru ◽  
Dairo Hernán Mesa-Grajales
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Abrasion Resistance ◽  
Retained Austenite ◽  
White Cast Iron ◽  
High Wear Resistance ◽  
Air Cooling ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

<p>High-Chromium White Cast Iron is a material highly used in mining and drilling shafts for oil extraction, due to its high wear resistance. However, because of the austenitic matrix found in the as-cast state, an adequate heat treatment cycle is necessary. This paper studies the effects of different cooling media after a destabilization treatment on the microstructure, hardening and abrasion resistance behaviors of a hypoeutectic high chromium white cast iron. The results show that although air cooling followed by immersion in CO2 can effectively reduce the retained austenite, this is not enough to transform completely the retained austenite into martensite. The low retained austenite percentages improve bulk hardness, but they decrease the abrasion resistance of the high chromium cast iron. The best combination of hardness and wear resistance was found in the samples cooled in air, due to the percentage of retained austenite and a moderate precipitation of chromium carbide.</p>

Influence of retained austenite on the wear resistance of high chromium cast iron under various impact loads

Wear ◽  
1993 ◽  
Vol 162-164 ◽  
pp. 83-88 ◽  
Author(s):  
Xi Jun-Tong ◽  
Zhou Qing-De ◽  
Liu Shi-Hui ◽  
Song Guang-Shun
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Retained Austenite ◽  
Impact Loads ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

Toughening Study on High Chromium Cast Iron Liner Plates of HZS Series Commercial Concrete Mixing Plant

2011 ◽  
Vol 179-180 ◽  
pp. 1338-1341
Author(s):  
Jiang Liu ◽  
Jun Fu
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Impact Toughness ◽  
Normal Operation ◽  
High Wear Resistance ◽  
Liner Material ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
The Impact ◽  
Chromium Cast Iron

Because of high wear resistance and low cost, high chromium cast iron liner plate is the most commonly used liner for HZS series concrete mixing station at present. However, in normal operation, the high-chromium cast iron liner produced by conventional casting process is easy to crack at its corners. We found that the cracking reasons of this type of liner plate are mainly the lower cast impact toughness, slightly higher hardness, and there has not gotten a good matching between the hard particles and the matrix organizations. Thus we used the secondary heat treatment to slightly reduce the hardness and increase the impact toughness of cast iron liner plate, which can improve the wear resistance and impact resistance of the liner material to extend the service life of these cast iron liners.

scholarly journals Effects of Heat-Treatment on the Microstructure and Wear Resistance of a High-Chromium Cast Iron for Rolls

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Zhi-hong Guo ◽  
Fu-ren Xiao ◽  
Su-ling Lu ◽  
Han-yun Li ◽  
Bo Liao
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Retained Austenite ◽  
Tempered Martensite ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
The Matrix ◽  
The Impact ◽  
Chromium Cast Iron ◽  
Martensite Matrix

The variations of microstructure and mechanical properties of a high-chromium cast iron for rolls were studied from as-cast to the final heat treatments. Results show that the as-cast microstructure of the HCCI consists of M7C3carbide, M23C6carbide, martensite matrix, and retained austenite. The large dendritic M7C3carbide surrounds the matrix, and the M23C6carbide is mainly distributed in the matrix. Part of M23C6carbide transforms to M7C3carbide and is dissolved in austenite during austenization at 1020°C. Thus, the amount of M23C6carbide decreases, whereas that of M7C3carbide increases after quenching; the highest hardness is also obtained. After tempering, the martensite transforms to a tempered martensite, and some carbide precipitates in the martensite matrix. The hardness also changes from HRC62.1, which corresponds to quenching, to HRC55.2 and HRC56.3, which correspond to once and twice tempering, respectively. However, tempering could improve the impact toughness and wear resistance of the HCCI.

scholarly journals Effect of Titanium Inoculation on Tribological Properties of High Chromium Cast Iron

2017 ◽  
Vol 17 (4) ◽  
pp. 143-146
Author(s):  
D. Siekaniec ◽  
D. Kopyciński ◽  
A. Szczęsny ◽  
E. Guzik ◽  
E. Tyrała ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Tribological Properties ◽  
Microstructural Analysis ◽  
Reference Sample ◽  
High Wear Resistance ◽  
Wear Loss ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

Abstract The present investigation focuses on the study of the influence of titanium inoculation on tribological properties of High Chromium Cast Iron. Studies of tribological properties of High Chromium Cast Iron, in particularly the wear resistance are important because of the special application of this material. High Chromium Cast Iron is widely used for parts that require high wear resistance for example the slurry pumps, brick dies, several pieces of mine drilling equipment, rock machining equipment, and similar ones. Presented research described the effects of various amounts of Fe-Ti as an inoculant for wear resistance. The results of wear resistance were collated with microstructural analysis. The melts were conducted in industrial conditions. The inoculation was carried out on the stream of liquid metal. The following amount of inoculants have been used; 0.17% Fe-Ti, 0.33% Fe-Ti and 0.66% Fe-Ti. The tests were performed on the machine type MAN. The assessment of wear resistance was made on the basis of the weight loss. The experimental results indicate that inoculation improve the wear resistance. In every sample after inoculation the wear resistance was at least 20% higher than the reference sample. The best result, thus the smallest wear loss was achieved for inoculation by 0.66% Fe-Ti. There is the correlation between the changing in microstructure and wear resistance. With greater amount of titanium the microstructure is finer. More fine carbides do not crumbling so quickly from the matrix, improving the wear resistance.

The influence of retained austenite in high chromium cast iron on impact-abrasive wear

Wear ◽  
1990 ◽  
Vol 135 (2) ◽  
pp. 217-226 ◽  
Author(s):  
Tong Jian-Min ◽  
Zhou Yi-Zhong ◽  
Shen Tian-Yi ◽  
Deng Hai-Jin
Keyword(s):  
Cast Iron ◽  
Abrasive Wear ◽  
Retained Austenite ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

Wear Resistance of Nano TiN Strengthen High Chromium Cast Iron

2012 ◽  
Vol 217-219 ◽  
pp. 2410-2413 ◽  
Author(s):  
Xing Hai Shao ◽  
Jing Pei Xie ◽  
Wen Yan Wang ◽  
Yan Li ◽  
Pin Gan Zhou ◽  
...  
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Cast Iron ◽  
Alloy Layer ◽  
Chromium Alloy ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Carbon Ferrochrome ◽  
Micro Analysis ◽  
Chromium Cast Iron

The effects and the mechanisms of namo TiN on the high chromium cast iron are studied, the material has been prepared through infiltration casting and addition of high carbon ferrochrome powder and nano TiN powder. The alloy is formed on the surfaced of guide plate, and the wear resistance of alloy have been studied by means of SEM, XRD micro-analysis and wear-resistant performance. The grain size and the type of carbide in the organization are affected by nano TiN, and the wear resistance of carbon chromium alloy layer is affected by the type of carbide; when the addition of nano TiN is 1% (wt), the grain size is apparently refined, overeutectic primary M7C3 in the hypereutectic is precipitated uniformly in considerable amounts, therefore the wear resistance of alloy can be improved effectively.

scholarly journals Effect of Repeated Tempering on Hardness and Retained Austenite of High Chromium Cast Iron Containing Molybdenum

2010 ◽  
Vol 51 (7) ◽  
pp. 1264-1271 ◽  
Author(s):  
Sudsakorn Inthidech ◽  
Khatawut Boonmak ◽  
Prasonk Sricharoenchai ◽  
Nobuya Sasaguri ◽  
Yasuhiro Matsubara
Keyword(s):  
Cast Iron ◽  
Retained Austenite ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron
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