2. Notations

We will note by:

\(\mathrm{Id}\)	identity matrix
\(\text{tr}A\)	trace of tensor \(A\)
\({A}^{T}\)	transposed from the \(A\) tensor
\(\text{det}A\)	determinant of \(A\)
\(\langle X\rangle\)	positive part of \(X\)
\(\tilde{A}\)	deviatory part of the \(A\) tensor defined by \(\tilde{A}=A-(\frac{1}{3}\text{tr}A)\text{Id}\)
\(:\)	doubly contracted product: \(A:B=\sum _{i,j}{A}_{\text{ij}}{B}_{\text{ij}}=\text{tr}({\text{AB}}^{T})\)
\(Ä\)	tensor product: \((\mathrm{AÄB}{)}_{\text{ijkl}}={A}_{\text{ij}}{B}_{\text{kl}}\)
\({A}_{\text{eq}}\)	equivalent von Mises value defined by \({A}_{\text{eq}}=\sqrt{\frac{3}{2}\tilde{A}:\tilde{A}}\)
\({Ñ}_{X}A\)	gradient: \({Ñ}_{X}A=\frac{\partial A}{\partial X}\)
\({\text{div}}_{x}A\)	discrepancy: \(({\text{div}}_{x}A{)}_{i}=\sum _{j}\frac{\partial {A}_{\text{ij}}}{\partial {x}_{j}}\)
\(\lambda\), \(\mu\)	Lamé coefficients: \(\lambda =\frac{\mathrm{E\nu }}{(1+\nu )(1-\mathrm{2\nu })}\), \(m=\frac{E}{2(1+\nu )}\)
\(E\)	Young’s module
\(\nu\)	Poisson’s ratio
\(K\)	compression stiffness modulus: \(\mathrm{3K}=\mathrm{3\lambda }+\mathrm{2m}=\frac{E}{(1-\mathrm{2\nu })}\)
T	temperature
\({T}_{\text{ref}}\)	reference temperature
\({Z}_{g}\)	austenite proportion
\({Z}_{i}\)	proportion of the four phases \(\alpha\): ferrite, pearlite, bainite and martensite

Moreover, in the context of time discretization, all the quantities evaluated at the previous instant are indexed by \({}^{-}\), the quantities evaluated at the instant \(t+\Delta t\) are not indexed and the increments are designated by \(\Delta\). We thus have:

\(\Delta Q=Q-{Q}^{-}\)