Empirical Correlation of Specimen Size Effects in Charpy Impact Properties of 11Cr-0.5Mo-2W, V, Nb Ferritic-Martensitic Stainless Steel

2004 ◽  
Vol 41 (10) ◽  
pp. 973-980 ◽  
Author(s):  
Akihiro UEHIRA ◽  
Shigeharu UKAI
Keyword(s):  
Stainless Steel ◽  
Size Effects ◽  
Martensitic Stainless Steel ◽  
Charpy Impact ◽  
Specimen Size ◽  
Empirical Correlation ◽  
Impact Properties

Modeling of Size Effects on the Flow Stress of Type 304 Stainless Steel and Application in Coining Process

2007 ◽  
Author(s):  
Gap-Yong Kim ◽  
Muammer Koc ◽  
Jun Ni
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Flow Stress ◽  
Size Effect ◽  
Size Effects ◽  
Specimen Size ◽  
304 Stainless Steel ◽  
Length Scales ◽  
Type 304 ◽  
Type 304 Stainless Steel

Application of microforming in various research areas has received much attention due to the increased demand for miniature metallic parts that require mass production. For the accurate analysis and design of microforming process, proper modeling of material behavior at the micro/meso-scale is necessary by considering the size effects. Two size effects are known to exist in metallic materials. One is the “grain size” effect, and the other is the “feature/specimen size” effect. This study investigated the “feature/specimen size” effect and introduced a scaling model which combined both feature/specimen and grain size effects. Predicted size effects were compared with experiments obtained from previous research and showed a very good agreement. The model was also applied to forming of micro-features by coining. A flow stress model for Type 304 stainless steel taking into consideration the effect of the grain and feature size was developed and implemented into a finite element simulation tool for an accurate numerical analysis. The scaling model offered a simple way to model the size effect down to length scales of a couple of grains and extended the use of continuum plasticity theories to micro/meso-length scales.

Effect of delta ferrite on impact properties of low carbon 13Cr–4Ni martensitic stainless steel

2010 ◽  
Vol 527 (13-14) ◽  
pp. 3210-3216 ◽  
Author(s):  
P. Wang ◽  
S.P. Lu ◽  
N.M. Xiao ◽  
D.Z. Li ◽  
Y.Y. Li
Keyword(s):  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Low Carbon ◽  
Delta Ferrite ◽  
Impact Properties

scholarly journals Charpy Impact Properties of Hydrogen-Exposed 316L Stainless Steel at Ambient and Cryogenic Temperatures

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 625 ◽  
Author(s):  
Le Thanh Hung Nguyen ◽  
Jae-Sik Hwang ◽  
Myung-Sung Kim ◽  
Jeong-Hyeon Kim ◽  
Seul-Kee Kim ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Low Temperatures ◽  
316L Stainless Steel ◽  
Charpy Impact ◽  
Cryogenic Temperatures ◽  
Absorbed Energy ◽  
Impact Properties ◽  
Charging Time ◽  
The Impact

316L stainless steel is a promising material candidate for a hydrogen containment system. However, when in contact with hydrogen, the material could be degraded by hydrogen embrittlement (HE). Moreover, the mechanism and the effect of HE on 316L stainless steel have not been clearly studied. This study investigated the effect of hydrogen exposure on the impact toughness of 316L stainless steel to understand the relation between hydrogen charging time and fracture toughness at ambient and cryogenic temperatures. In this study, 316L stainless steel specimens were exposed to hydrogen in different durations. Charpy V-notch (CVN) impact tests were conducted at ambient and low temperatures to study the effect of HE on the impact properties and fracture toughness of 316L stainless steel under the tested temperatures. Hydrogen analysis and scanning electron microscopy (SEM) were conducted to find the effect of charging time on the hydrogen concentration and surface morphology, respectively. The result indicated that exposure to hydrogen decreased the absorbed energy and ductility of 316L stainless steel at all tested temperatures but not much difference was found among the pre-charging times. Another academic insight is that low temperatures diminished the absorbed energy by lowering the ductility of 316L stainless steel.

Fracture Toughness JIC Prediction From Super-Small Specimens (0.2CT, 0.5MM Thick) of a Martensitic Stainless Steel HT-9

1991 ◽  
Vol 113 (1) ◽  
pp. 135-140
Author(s):  
Xingyuan Mao
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Shear Fracture ◽  
Specimen Size ◽  
Evaluation Procedure ◽  
Specimen Thickness ◽  
Rigid Plastic ◽  
Toughness Testing ◽  
Stretch Zone Width

The fracture toughness of alloy HT-9, a martensitic stainless steel under consideration for fusion reactor applications, was determined from 0.2CT (0.5mm thick) specimens. Specimens with thicknesses of 25 (1CT), 10 (0.4CT), 3 and 0.5 (0.2CT)mm were tested to investigate the effects of specimen size on fracture toughness. 0.2CT (0.5mm thick) specimens did not satisfy ASTM E813 size requirements for a valid JIc. Fractographic examinations of the variation of stretch zone width and fracture modes along the specimen thickness were performed by scanning electron microscopy (SEM), where flat and shear fracture regions had been distinguished. A new JIc evaluation procedure for invalid specimen size is proposed using rigid plastic analysis and shear fracture measurements with fractographic observations. Predicted JIc values were compared with the JIc values obtained from valid specimen sizes. This miniaturized specimen technique may be applicable to post-irradiation fracture toughness testing.

Influence of Nb Addition on Impact Toughness of As-Quenched Martensitic Stainless Steel for Automotive Applications

2018 ◽  
Vol 941 ◽  
pp. 245-250
Author(s):  
Jean Denis Mithieux ◽  
Hélène Godin ◽  
Anne Françoise Gourgues-Lorenzon ◽  
Coralie Parrens
Keyword(s):  
Stainless Steel ◽  
Impact Toughness ◽  
Martensitic Stainless Steel ◽  
Charpy Impact ◽  
Tensile Tests ◽  
Cleavage Crack ◽  
Local Approach ◽  
Brittle Transition ◽  
Ductile To Brittle Transition ◽  
Nb Addition

This study presents how Nb addition allowed improving the Charpy impact toughness of a martensitic stainless steel by comparing a conventional AISI410 (12%Cr-0.1%C) and a 12%Cr-0.1%C-0.1%Nb steel after the same austenitization and quenching heat treatment. Adding niobium decreased the ductile-to-brittle transition temperature by 100°C with respect to the Nb-free steel. To identify quantitative fracture criteria for the two materials, the values of critical cleavage fracture stress were determined by the local approach to fracture, combining low temperature tensile tests on notched specimens and mechanical analysis by the finite element method. The main effects of niobium were to refine the grain size and to promote retained austenite films, resulting in a similar resistance to cleavage crack initiation but in a strong improvement of the ductile-to-brittle transition behavior by increasing the resistance to cleavage crack propagation.

Sign in / Sign up

Export Citation Format

Share Document