Martensitic transformation induced by single shot peening in a metastable austenitic stainless steel 301LN: Experiments and numerical simulation

Abstract

During conventional shot peening on metastable austenitic steels, martensitic transformation occurs in addition to plastic straining. In this work, the impact of a single spherical steel shot on a AISI 301LN steel was studied. The volume fraction of martensite, residual stresses in both phases were determined in the vicinity of the dent as a function of the shot velocity and diameter. An elasto-plastic two phase model that includes martensitic phase transformation was adapted to model mechanical and microstructural fields and implemented in Abaqus Explicit for the 2D simulation of a single shot impact. It was found, for instance, that the martensitic transformation takes place only under the dent and that martensite is in tension at the surface while austenite is in compression. Simulation results of stress levels showed a good agreement with experimental stresses determined by X-ray diffraction.

A Comprehensive Numerical Approach for Analyzing the Residual Stresses in AISI 301LN Stainless Steel Induced by Shot Peening

“…Figure 1 presents the simulated behavior curves. It can be seen that the yield stress and the martensitic volume fraction agrees well with the experimental results from the literature [20]. The martensitic transformation starts at the strain of about 12% and increases to 0.6 of the volume fraction at the strain of 0.25.…”

“…The constitutive model has been implemented in the finite element software ABAQUS by developing a user subroutine. Because we are going to compare the simulated results of the shot peening with that in the literature [20], the material mechanical behaviors from tensile tests in Reference [20] are taken as the targets of the optimizations.…”

“…Both axisymmetric single shot and random multiple shots models were developed. For comparison, the simulated conditions of the axisymmetric single shot model were according to the experimental ones [20]. The target specimen was modelled as a rectangle with a width of 35 mm and 25 mm in height.…”

“…It has been found that results by a nonlinear kinematic-isotopic model which considered both effects of isotropic hardening and kinematic hardening were the best compared with other traditional models. Recently, Guiheux [20] has proposed a semi-phenomenological model coupling the martensitic phase transformation and the elastoplastic behavior of austenite and martensite, and studied a single spherical normal shot on strain-induced martensitic transformation in 301LN steel. In this work, the phase transformation, the coupling between plasticity and transformation-induced plasticity, and the mixed hardening effects induced by shot peening will increase the complexity of constructing the constitutive model of the 301LN steel.…”

Shot peening of TRIP780 steel: Experimental analysis and numerical simulation

“…evolution of the volume fraction of martensite f versus the control parameters, is defined within a thermodynamical time-independent framework. Guiheux et al (2017) completed the transformation kinetics proposed by Kubler et al (2011), where the transformation kinetics involves Patel-Cohen (Patel and Cohen, 1953) and Olson-Cohen (Olson and Cohen, 1982)…”