scholarly journals Regenerative Heat Treatment of Low Alloy Cast Steel

10.5772/50505 ◽  
2012 ◽  
Author(s):  
Grzegorz Golanski
Keyword(s):  
Heat Treatment ◽  
Cast Steel ◽  
Regenerative Heat ◽  
Alloy Cast

Mechanical Properties of G17CrMoV5 – 10 Cast Steel after Regenerative Heat Treatment

2009 ◽  
Vol 147-149 ◽  
pp. 732-737 ◽  
Author(s):  
Grzegorz Golański
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Energy ◽  
Cast Steel ◽  
Negative Influence ◽  
Optimum Combination ◽  
Structure And Properties ◽  
Tempering Temperature ◽  
Regenerative Heat ◽  
Bainitic Structure

The paper presents results of research on the influence of regenerative heat treatment on structure and properties of G17CrMoV5 – 10 cast steel. Investigated material was taken out from a turbine frame serviced for over 250 000 hours (total service time) at the temperature of 535 oC. The cast steel after service revealed degraded bainitic-ferritic structure and was characterized by mechanical properties ranging below norm requirements. It has been proved that high tempering temperature in the case of cast steel with bainitic structure ensures optimum combination of mechanical properties and impact energy. It has also been shown that ferrite has a negative influence on impact energy of the cast steel with bainitic-ferritic structure.

Microstructure and Mechanical Properties of G17CrMoV5-10 Cast Steel After Regenerative Heat Treatment

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Grzegorz Golański
Keyword(s):  
Heat Treatment ◽  
Impact Energy ◽  
Cast Steel ◽  
Strength Properties ◽  
Optimum Combination ◽  
Austenitizing Temperature ◽  
Energy Increase ◽  
Regenerative Heat ◽  
Term Operation

This paper presents the results of a research on the influence of regenerative heat treatment on microstructure and properties of a cast steel after long-term operation at the elevated temperature. The material under investigation was G17CrMoV5-10 cast steel taken out (in the form of a section) from an internal frame of steam turbine serviced for about 250,000 h. Performed research has proven that through the microstructure degradation long-term service contributes to an embrittlement and decrease in yield strength and tensile strength. The heat treatment, however, contributes to an impact energy increase regardless of the applied parameters (cooling rate). It has also been established that the optimum combination of strength properties and impact energy is ensured by the microstructure of high tempered bainite, whereas low strength properties and impact energy were obtained for the microstructure, which was slowly cooled from the austenitizing temperature, i.e., the ferritic-bainitic-ferritic microstructure.

Formation of structure and properties of complex alloy cast steel

2020 ◽  
pp. 429-432
Author(s):  
V.S. Muratov ◽  
E.A. Morozova ◽  
N.S. Yakimov
Keyword(s):  
Heat Treatment ◽  
Cast Steel ◽  
Structural Heterogeneity ◽  
Alloying Elements ◽  
Allowable Limit ◽  
Complex Alloy ◽  
Typical Composition ◽  
The Impact ◽  
Alloy Cast ◽  
Experimental Melting

The patters of the effect of change in the chemical composition and modes of heat treatment on the structure and complex of mechanical properties of cast steel VKL-3 (12Kh2NVML) are studied. The experimental melting of steel with increased content of chromium, silicon, nickel and molybdenum is obtained. The steel of this composition has reduced ductility and toughness. At the same time, experimental steel melting makes it possible to the model segregation zones with increased content of alloying elements in the steel of typical composition that has chemical and structural heterogeneity and heterogeneity of ductility and toughness. It is shown that the use of the fi nal heat treatment with the adjusted modes (in particular, increased temperature and time of tempering) allows increasing the ductility of the steel to the required values, but the impact strength does not reach the required levels. The recommendations for maintaining of the alloying elements content near the lower allowable limit are given.

Microstructure and Mechanical Properties of G17CrMoV5 – 10 Cast Steel After Regenerative Heat Treatment

2009 ◽  
Author(s):  
Grzegorz Golan´ski
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Energy ◽  
Cast Steel ◽  
Optimum Combination ◽  
Austenitizing Temperature ◽  
Regenerative Heat ◽  
Term Operation ◽  
Structure Degradation

The paper presents results of research on the influence of regenerative heat treatment on microstructure and properties of a cast steel after long term operation at the elevated temperature. The material under investigation was G17CrMoV5 – 10 cast steel taken out (in the form of a section) from an internal frame of steam turbine serviced for about 250 000 hours. Performed research has proved that, through the structure degradation, long-term service contributes to an increase of brittleness and decrease of mechanical properties — higher in the case of yield strength than tensile strength. The heat treatment, however, contributes to an increase of impact energy, regardless of the applied parameters. Is has also been proved that the optimum combination of mechanical properties and impact energy is ensured by the structure of high tempered bainite. Low mechanical properties and impact energy, however, were obtained for the structure which was slowly cooled from the austenitizing temperature, i.e. the ferritic – bainitic – ferritic structure.

Influence of Heat Treatment on Mechanical Properties and Microstructure of Low Alloy Cast Steel (ZG25MnNi)

2014 ◽  
Vol 887-888 ◽  
pp. 207-213
Author(s):  
Teng Shi Liu ◽  
Yi Tao Yang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Cast Steel ◽  
High Strength ◽  
Treatment Temperature ◽  
Maximum Hardness ◽  
Tempering Temperature ◽  
Cast Microstructure ◽  
Alloy Cast

In this paper, the influence of heat treatment temperature on the microstructure and mechanical properties of cast steel (ZG25MnNi) was investigated. The results showed that normalizing treatment can effectively refine cast microstructure of ZG25MnNi and maximum hardness achieved at 900°C. After normalized at 900°C, the sample tempered at 500°C,530°C,560°C, 590°C, 620°C, 650°C respectively. With the tempering temperature increasing, the samples tensile strength increased gradually and elongation decreased gradually. When tempered at 530-590°C, the sample had a relatively high strength plastic product. The results showed that the best normalizing temperature is 900°C and the optimum tempering temperature is 530-590°C.

scholarly journals The Structure of the Silumin Coat on Alloy Cast Steels

2012 ◽  
Vol 12 (2) ◽  
pp. 215-220
Author(s):  
T. Szymczak
Keyword(s):  
Phase Structure ◽  
High Speed ◽  
Cast Steel ◽  
Intermetallic Phases ◽  
External Layer ◽  
Cast Steels ◽  
Steel Grades ◽  
The Absolute ◽  
The Given ◽  
Alloy Cast

The Structure of the Silumin Coat on Alloy Cast Steels The work presents the analysis results of the structure of the coat obtained by dipping in silumin AlSi5 of two grades of alloy cast steel: GX6CrNiTi18-10 (LH18N9T) and GX39Cr13 (LH14). The temperature of the silumin bath was 750±5°C, and the hold-up time of the cast steel element τ = 180 s. The absolute thickness of the coat obtained in the given conditions was g = 104 μm on cast steel GX6CrNiTi18-10 and g = 132 μm on GX39Cr13. The obtained coat consisted of three layers of different phase structure. The first layer from the base "g1" was constructed of the phase AlFe including Si and alloy additives of the tested cast steel grades: Cr and Ni (GX6CrNiTi18-10) and Cr (GX39Cr13). The second layer "g1" of intermetallic phases AlFe which also contains Si and Cr crystallizes on it. The last, external layer "g2" of the coat consists of the silumin containing the intermetallic phases AlFeSi which additionally can contain alloy additives of the cast steel. It was shown that there were no carbides on the coat of the tested cast steels which are the component of their microstructure, as it took place in the case of the coat on the high speed steels.

Microstructures and Properties of a Bainite and Martensite Dual-Phase Cast Steel Fabricated by Combination of Alloying and Controlled Cooling Heat Treatment

2005 ◽  
Vol 475-479 ◽  
pp. 93-96 ◽  
Author(s):  
Ye Hua Jiang ◽  
Rong Feng Zhou ◽  
Dehong Lu ◽  
Zhen Hua Li
Keyword(s):  
Heat Treatment ◽  
Cast Steel ◽  
Residual Austenite ◽  
Lower Bainite ◽  
Manganese Steel ◽  
Isothermal Quenching ◽  
Dual Phase ◽  
Controlled Cooling ◽  
Carbide Particles ◽  
Better Than

A bainite/martensite dual-phase cast steel was fabricated by a process of combination of alloying with Si and Mn elements and controlled cooling heat-treatment. Its microstructure was consisted of fine lower bainite with carbide particles precipitated homogeneously, martensite and a little residual austenite. Because of the good match of hardness and impact toughness, its impact wear performance was a little better than that of the isothermal quenching steel, and much better than that of high manganese steel such as Mn13.

Influence of Ni content on impact-abrasion wear resistance of medium-carbon low alloy cast steel

2019 ◽  
Vol 6 (10) ◽  
pp. 106594
Author(s):  
Yongxin Xie ◽  
Ying Liu ◽  
Hong Guo ◽  
Wei Li ◽  
Dahai Zeng
Keyword(s):  
Wear Resistance ◽  
Cast Steel ◽  
Medium Carbon ◽  
Ni Content ◽  
Abrasion Wear ◽  
Alloy Cast
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