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

[+] Author and Article Information
Grzegorz Golański

Institute of Materials Engineering, Czestochowa University of Technology, Armii Krajowej 19, 42-200 Czestochowa, Polandgrisza@wip.pcz.pl

J. Pressure Vessel Technol 132(6), 064503 (Oct 29, 2010) (5 pages) doi:10.1115/1.4001922 History: Received November 19, 2009; Revised May 20, 2010; Published October 29, 2010; Online October 29, 2010

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.

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Figure 1

Influence of the phosphorus content and microstructure on the impact energy of the G17CrMoV5-10 cast steel for its long-term operation (between 50,000 and 84,000 h) at the temperature of 535°C Reprinted with permission from Stachura (4). Copyright © 2004, Przeglad Odlewnictwa.

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Figure 2

Microstructure of the investigated G17CrMoV5-10 cast steel after long-term operation: (a) OM and (b) SEM

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Figure 3

Carbides revealed in the G17CrMoV5-10 cast steel: (a) VC carbide inside bainite laths and (b) precipitation of an H-carbide type inside bainite laths, extraction carbon replica, thin foil, TEM

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Figure 4

Influence of cooling rate on microstructure and hardness of the G17CrMoV5-10 cast steel, where F is the ferrite, B is the bainite, P is the pearlite, HV30-Vickers hardness at the load of 294 N (30 kG), V8–5-cooling rate between the temperature of 800 and 500°C(7)

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Figure 5

Microstructure of the G17CrMoV5-10 cast steel after regenerative heat treatment: (a, b) tempered bainite microstructure, (c, d) tempered bainitic-ferritic microstructure, and (e, f) tempered ferritic-bainitic-pearlitic microstructure; OM, SEM, and nital etched

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