Bauschinger effect and latent hardening under cyclic micro-bending of Ni-base Alloy 718 single crystals: Part I. Experimental analysis of single and multi slip plasticity
Artikel i vetenskaplig tidskrift, 2021

Cyclic micro-bending tests on fcc single crystal Ni-base Alloy 718 cantilevers with different crystal orientations were performed to analyze the influence of activated slip systems on dislocation plasticity, latent hardening and the Bauschinger effect. The investigations indicate that plasticity in single crystal micro-cantilevers is significantly influenced by two phenomena - dislocation interaction and dislocation pile-up at the neutral plane. Both phenomena occur at the same time. Their ratio seems to be determined by the activated slip systems. Slip trace analysis indicates that the activation of only one slip system leads to a strong localization of plasticity to a limited number of parallel slip bands. This results in low dislocation interaction and consequently pronounced pile-ups at the neutral plane. In multi slip orientation, the second slip system leads to activation of significantly more dislocation sources, causing a much earlier and more homogeneous elastic-plastic transition zone. In stress-strain hysteresis loops during bending, pronounced dislocation interaction in multi slip orientation leads to a more pronounced latent hardening. The results suggest that on a microstructural length scale, plasticity behavior is strongly affected by activated slip systems, which determine local dislocation phenomena. Based on the results presented in this paper, a finite element analysis of latent hardening and the Bauschinger effect using a single crystal plasticity model with latent kinematic hardening is presented in Part II.

Bauschinger effect

Slip trace analysis

Cyclic micro-bending

Nickel-based superalloys

Latent kinematic hardening

Single crystal plasticity

Författare

M. Kreins

RWTH Aachen University

S. Schilli

Hochschule Offenburg

T. Seifert

Hochschule Offenburg

Anand Harihara Subramonia Iyer

Chalmers, Fysik, Mikrostrukturfysik

Magnus Hörnqvist Colliander

Chalmers, Fysik, Mikrostrukturfysik

S. Wesselmecking

RWTH Aachen University

U. Krupp

RWTH Aachen University

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

0921-5093 (ISSN)

Vol. 827 142027

Ämneskategorier

Teknisk mekanik

Datavetenskap (datalogi)

DOI

10.1016/j.msea.2021.142027

Mer information

Senast uppdaterat

2021-09-27