PSI - Issue 28

Fedor S. Belyaev et al. / Procedia Structural Integrity 28 (2020) 2110–2117 Author name / Structural Integrity Procedia 00 (2019) 000–000

2116

7

Material constant

Value

Characteristic temperatures Mf, Ms, As, Af

378, 408, 453, 500 K

Latent heat q0

-50 MJ/m3

Number of martensite variants N

12

1 1 2 � 1 1 1 �2 �2 �2 � 180 GPa

Lattice deformation matrix D by Schumann (1964) (to be symmetrized)

Elastic modulus of austenite EA Elastic modulus of martensite EM Poisson’s ratio of austenite  A Poisson’s ratio of martensite  M Critical reorientation force Ffr tw Isotropic hardening factor ay Kinematic hardening factor a  Oriented defects saturation factor β*

180 GPa

0.33 0.33

160 MJ/m 800 MPa 8000 MPa

20

Parameter of softening r 0.003 Parameter of the hydrostatic pressure influence on fracture k1 0 Parameter of the oriented defects influence on fracture k2 0.5 Damage scaling factor B 1

900 1000 1100

experiment modeling

800

 max , MPa

700

600

10 3

10 4

10 5

N Fig. 3. Number of cycles to failure vs. maximum stress σ max of the isothermal loading cycle, experimental data and model calculations.

Acknowledgements This research was supported by the grants of Russian Foundation of Basic Research 19-01-00685. The authors express their thanks to professor Victor Sagaradze for the presented metal plates. Equipment of the Chemical Analysis and Materials Research Centre, the Thermogravimetric and Calorimetric Research Centre and the Centre for Extreme States of Materials and Constructions of Saint Petersburg State University (http://researchpark.spbu.ru) has been used.