Tensile and Fatigue Testing and Material Hardening Model Development for 508 LAS Base Metal and 316 SS Similar Metal Weld under In-air and PWR Primary Loop Water Conditions

Abstract

As part of the Department of Energy's Light Water Reactor Sustainability (DOE/LWRS) program, we are developing time-independent material models based on tensile tests and time-dependent material models based on cyclic tests for different reactor materials, such as 316 stainless steel (SS), 508 lowalloy steel (LAS) base metal, 316 SS-316 SS similar metal welds, and 316 SS-508 LAS dissimilar metal welds. Also, materials models are being developed under different environmental conditions, such as in air (at room temperature and 300 o C) and PWR primary loop water (at 300 o C). In our previous work, we presented time-dependent material models for 316 SS base metals [15][16][17]. In this report, we present tensile and fatigue test results and associated material models under different test and environmental conditions for 508 LAS base metal and 316 SS-316 SS similar metal welds.

Chaboche-based cyclic material hardening models for 316 SS–316 SS weld under in-air and pressurized water reactor water conditions

“…Based on Von-Mises stress criteria and original Chaboche material hardening model, the present work proposes time-dependent linear and nonlinear material hardening models. The details of the material models and parameter estimation technique can be found elsewhere [15,16]. However, the important expressions related to the material models are presented below.…”

“…The related tensile and fatigue test conditions with test identification (ID) are given in Table 1. The details of the experimental setup and test results are given in an earlier Argonne report [16]. [16].…”

“…The details of the experimental setup and test results are given in an earlier Argonne report [16]. [16]. The estimated material properties can be used for development of component-level elasticplastic FE models, which is one of the authors' future tasks.…”

“…This paper presents tensile and fatigue test results and associated material model parameters under different test and environmental conditions for 316 SS-316 SS welds. The details of the material model and test results can be found in a recently published Argonne report [16]. This paper summarizes the relevant results.…”

Methodology for Stress-Controlled Fatigue Test Under In-Air and Pressurized Water Reactor Coolant Water Condition and to Evaluate the Effect of Pressurized Water Reactor Water and Loading Rate on Ratcheting

“…In general, austenitic steel, such as 316 stainless steel (SS) and 304 SS, exhibits significant amount of cyclic hardening behavior. It has been found that ratcheting strain not only depends on the material but also the loading factors, such as stress level, loading history, stress rate, and loading path [3,[7][8][9][10][11]. For time-dependent materials, stress rate plays an important role on ratcheting and should be taken into account [5].…”