Hot Workability of Ultra-Supercritical Rotor Steel Using a 3-D Processing Map Based on the Dynamic Material Model

Autor: Tao Huang, Xuewen Chen, Kexue Du, Yuqing Du, Tingting Lian
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Materials
Volume 13
Issue 18
Materials, Vol 13, Iss 4118, p 4118 (2020)
ISSN: 1996-1944
DOI: 10.3390/ma13184118
Popis: As a new-type of ultra-supercritical HI-IP rotor steel, X12CrMoWVNbN10-1-1 alloy steel has excellent integrative performance, which can effectively improve the power generation efficiency of the generator set. In this paper, uniaxial thermal compression tests were carried out over a temperature range of 950&ndash
1200 °
C and strain rates of 0.05&ndash
5 s&minus
1 with a Gleeble-1500D thermal simulation testing machine. Moreover, based on hot compression experimental data and the theory of processing diagrams, in combination with the dynamic material model, a three-dimensional (3-D) thermal processing map considering the effect of strain was constructed. It was concluded that optimum thermal deformation conditions were as follows: the temperature range of 1150&ndash
C, the strain rate range of 0.05&ndash
0.634 s&minus
1. Through secondary development of the finite element (FE) software FORGE®
three-dimensional thermal processing map data were integrated into finite element software FORGE®
The distributions of instability coefficient and power dissipation coefficient were obtained over various strain rates and temperatures of the Ø
8 ×
12 mm cylinder specimen by using finite element simulation. It is shown that simulation results are consistent with the microstructure photos. The method proposed in this paper, which integrates the three-dimensional processing map into the finite element software FORGE®
(Forge NxT 2.1, Transvalor, Nice, France), can effectively predict the formability of X12CrMoWVNbN10-1-1 alloy steel.
Databáze: OpenAIRE
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