Dynamic fracture toughness and Charpy impact properties of an AISI 403 martensitic stainless steel

By contrast with static fracture toughness determination, the methodology for dynamic fracture toughness characterization is not yet standardized and appropriate approaches must be devised. The accurate determination of the dynamic stress intensity factors must take into account inertial effects. Most methods for dynamic fracture toughness measurement are experimentally complex. However, dynamic fracture toughness determination using strain measurement is extremely attractive in terms of experimental simplicity. In this study, dynamic fracture toughness tests using strain measurement are performed. High rate tension and charpy impact tests are carried out for titanium alloy, maraging steel and Al alloys. In the case of evaluating the dynamic fracture toughness using high rate tension and charpy impact tests, load or energy methods are used commonly. The consideration about inertial effects is essential, because load or energy methods are influenced by inertia. In contrast, if the position for optimum response of strain is provided, dynamic fracture toughness evaluation using strain near crack tip is more accurate. To obtain the position for optimum response of strain, a number of gages were attached at angles of 60°. Reliability for experimental results is evaluated by Weibull analysis. The method presented in this paper is easy to implement in a laboratory and it provides accurate results compared to results from load or energy methods influenced by inertia.

Download Full-text

Evaluation of dynamic fracture toughness parameters of locomotive axle steel by instrumented Charpy impact test

Fatigue & Fracture of Engineering Materials & Structures ◽

10.1111/ffe.12510 ◽

2016 ◽

Vol 40 (4) ◽

pp. 512-522 ◽

Cited By ~ 3

Author(s):

A. P. Sorochak ◽

P. O. Maruschak ◽

O. P. Yasniy ◽

T. Vuherer ◽

S. V. Panin

Keyword(s):

Fracture Toughness ◽

Dynamic Fracture ◽

Impact Test ◽

Charpy Impact ◽

Charpy Impact Test ◽

Dynamic Fracture Toughness

Download Full-text

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

Metals ◽

10.3390/met9060625 ◽

2019 ◽

Vol 9 (6) ◽

pp. 625 ◽

Cited By ~ 5

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.

Download Full-text