Microstructural sensitivity of 316H austenitic stainless steel: Residual stress relaxation and grain boundary fracture

2010 ◽  
Vol 527 (27-28) ◽  
pp. 7387-7399 ◽  
Author(s):  
B. Chen ◽  
P.E.J. Flewitt ◽  
D.J. Smith
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stress Relaxation ◽  
Grain Boundary ◽  
Residual Stress Relaxation ◽  
Grain Boundary Fracture ◽  
Boundary Fracture

Mechanism Study on IGSCC by Analyzing Residual Stress and Work Hardening in Welds of Low-Carbon Austenitic Stainless Steel With Surface Machining

2010 ◽  
Author(s):  
Masahito Mochizuki ◽  
Hiroaki Mori ◽  
Jinya Katsuyama
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
Surface Hardening ◽  
Boundary Energy ◽  
Grain Boundary Sliding ◽  
Surface Machining ◽  
Boundary Sliding ◽  
Cold Rolled

To make clear the effects of residual stress and work hardening on intergranular stress corrosion cracking behavior in the welds of the austenitic stainless steel with surface hardening, residual stress and hardness in butt joints of pipes are evaluated by 3-dimentional thermal elastic-plastic analysis and the grain boundary sliding behavior is examined using constant strain rate tensile test. Based on these results, the mechanism of IGSCC has been clarified by the integrated knowledge between metallurgy and mechanics. The relationship between plastic strain and hardness in hard-machined surface near welds is clarified from the experimented relationship and the thermal elastic-plastic analysis. The distributions of hardness and residual stress with the actual surface machining could be evaluated. It was made clear that grain boundary sliding occurred in the steel at 561K by a constant strain rate tensile test with the numerically simulated tensile residual stress due to welding and surface machining. From the comparison of grain boundary sliding behavior between solution treated specimen and cold-rolled one, the grain boundary sliding in cold-rolled one occurs in smaller strain conditions than that in solution treated one, and the amount of grain boundary sliding in cold-rolled one increases remarkably with increase in added strain. In addition, it is clarified that the grain boundary energy is raised by the grain boundary sliding. On the basis of these results, it is concluded that the cause of intergranular stress corrosion cracking in the welds of Type 316L austenitic stainless steel with surface hardening is the increase in grain boundary energy due to grain boundary sliding accelerated by residual stress of multi pass welding and surface hardening.

Comparative study of the effective parameters on residual stress relaxation in welded aluminum plates under cyclic loading

2020 ◽  
Vol 21 (5) ◽  
pp. 505
Author(s):  
Yousef Ghaderi Dehkordi ◽  
Ali Pourkamali Anaraki ◽  
Amir Reza Shahani
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Stress Relaxation ◽  
Stress Amplitude ◽  
Cyclic Plasticity ◽  
Mean Stress ◽  
Effective Parameters ◽  
Perfect Plasticity ◽  
Residual Stress Relaxation ◽  
Aluminum Plates

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

Residual Stress Evaluation In Austenitic Stainless Steel Butt Weld Joints By Ultrasonic Technique

1992 ◽  
Vol 25 (3) ◽  
pp. 130 ◽  
Author(s):  
P. Palanichamy ◽  
A. Joseph ◽  
K. V. Kasiviswanathan ◽  
D. K. Bhattacharya ◽  
Baldev Raj
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Ultrasonic Technique ◽  
Butt Weld ◽  
Stress Evaluation ◽  
Weld Joints

Residual Stress Evaluation of Ni Based Weld Metal Using Neutron Diffraction Method

2006 ◽  
Vol 524-525 ◽  
pp. 697-702 ◽  
Author(s):  
Shinobu Okido ◽  
Hiroshi Suzuki ◽  
K. Saito
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Neutron Diffraction ◽  
Weld Metal ◽  
Diffraction Method ◽  
Fem Analysis ◽  
Butt Weld ◽  
Stress Evaluation ◽  
Neutron Diffraction Method

Residual stress generated in Type-316 austenitic stainless steel butt-weld jointed by Inconel-182 was measured using a neutron diffraction method and compared with values calculated using FEM analysis. The measured values of Type-316 austenitic stainless steel as base material agreed well with the calculated ones. The diffraction had high intensity and a sharp profile in the base metal. However, it was difficult to measure the residual stress at the weld metal due to very weak diffraction intensities. This phenomenon was caused by the texture in the weld material generated during the weld procedure. As a result, this texture induced an inaccurate evaluation of the residual stress. Procedures for residual stress evaluation to solve this textured material problem are discussed in this paper. As a method for stress evaluation, the measured strains obtained from a different diffraction plane with strong intensity were modified with the ratio of the individual elastic constant. The values of residual stress obtained using this method were almost the same as those of the standard method using Hooke’s law. Also, these residual stress values agreed roughly with those from the FEM analysis. This evaluation method is effective for measured samples with a strong texture like Ni-based weld metal.

Sign in / Sign up

Export Citation Format

Share Document