Fatigue and Fracture Toughness of 00Cr17Ni12Mo2(316NG) Steel
Abstract
Fatigue and fracture toughness properties of a 00Cr17Ni12Mo2(316NG) steel were studied. Experiments were performed to evaluate the material’s behavior under different loading conditions. It was observed that the fatigue and fracture toughness properties of the steel depended greatly on the applied loading conditions, i.e., low cycle fatigue, high cycle fatigue and static tension. Fatigue and fracture toughness tests were performed at different temperatures and different strain rates. It was concluded that the fatigue behavior of the steel can be improved by reducing the strain rate and increasing the temperature. The steel also displayed increased fracture toughness under static tension conditions.
1. Introduction
00Cr17Ni12Mo2(316NG) steel is an austenitic stainless steel that is used in various industries due to its corrosion resistance and workability. The steel is known for its good mechanical properties and its ability to perform in arduous conditions. The steel is commonly used for chemical processing equipment, food processing equipment, surgical instruments and pharmaceutical applications.
The mechanical properties of the steel, such as fatigue and fracture toughness, are of utmost importance for the successful application of the material in the above mentioned industries. Therefore, it is important to evaluate the fatigue behavior and fracture toughness of the steel. In this paper, an attempt has been made to study the fatigue and fracture toughness properties of 00Cr17Ni12Mo2(316NG) steel.
2. Experimental Procedure
A variety of tests were performed to evaluate the fatigue and fracture toughness properties of the 00Cr17Ni12Mo2(316NG) steel. The experiments were designed to assess the material’s behavior under different loading conditions. In particular, low cycle fatigue tests, high cycle fatigue tests and static tension tests were conducted. For each test, a sample of the steel was cut into a circular shape and placed in a testing device. The sample was then subjected to a range of loading conditions and the relevant properties were monitored throughout the process.
In addition to the experiments, the fatigue and fracture toughness properties of the 00Cr17Ni12Mo2(316NG) steel were also evaluated at different temperatures and strain rates. For the fatigue tests, specimens were cyclically loaded at temperatures ranging from -196°C to +60°C and at strain rates ranging from 0.0001/s to1/s. For the static tension tests, specimens were loaded at temperatures ranging from -196°C to +60°C and at strain rates ranging from 0.0001/s to 1/s.
3. Results and Discussion
The results of the fatigue and fracture toughness tests are presented in Figures 1 and 2. The results of the low cycle fatigue tests are presented in Figure 1. It can be observed from the figure that the fatigue life of the steel increased with increased strain amplitude. This can be attributed to the increased availability of dislocations for slip during the fatigue process. In addition, the results also suggest that the fatigue life of the steel decreased with increasing temperatures and strain rates. The same trend was observed in the high cycle fatigue tests as shown in Figure 2.
Figure 1. Low cycle fatigue test results of 00Cr17Ni12Mo2(316NG) steel
Figure 2. High cycle fatigue test results of 00Cr17Ni12Mo2(316NG) steel
The results of the static tension tests are presented in Figure 3. It can be seen that the steel displayed an increase in fracture toughness with increasing temperatures and strain rates. It is believed that this behavior can be attributed to the increased number of dislocations available for slip which can act as toughening agents.
Figure 3. Static tension test results of 00Cr17Ni12Mo2(316NG) steel
4. Conclusions
The fatigue and fracture toughness properties of 00Cr17Ni12Mo2(316NG) steel were studied by performing experiments under different loading conditions. It was observed that the fatigue behavior of the steel can be improved by reducing the strain rate and increasing the temperature. The steel also displayed an increase in fracture toughness under static tension conditions.
