Prediction of High-Cycle Fatigue Performance of 1Cr11Ni2W2MoV Stainless Steel Plate after Foreign Object Damage

Zhenhua Zhao,Lulu Liu,Chao Liu,Wei Chen,Lingfeng Wang,Marco Pizzarelli

doi:10.1155/2020/8837564

Abstract

High-cycle fatigue (HCF) properties of 1Cr11Ni2W2MoV stainless steel impacted by a high-speed steel ball were studied by the foreign object damage (FOD) test and HCF test. The results show that the damage depth Z has the most obvious effect on the HCF limit of notched flat plate specimens, and the fatigue limit decreases with the increase of depth Z . The microcharacteristics of the FOD notch and HCF fracture of 1Cr11Ni2W2MoV stainless steel were observed by a scanning electron microscope (SEM). The results show that the microdamage features such as plastic deformation, loss of material, and microcracks promote the initiation and propagation of fatigue cracks, and the fatigue source area lies near the root of the notch. The Peterson formula and Worst Case Notch (WCN) mode were used to predict the HCF limit of flat plate specimens after FOD. The crack growth threshold was obtained by the crack growth test. The results show that the prediction results of both methods are conservative. For the notch with damage depth Z < 1 mm, the prediction accuracy of the WCN model is higher ( error range < 30 % ). For the notch with damage depth Z > 1 mm, the prediction results of both methods have large errors (>30%) with the WCN model being slightly more accurate.

Highlights

During the service of aeroengine, it is unavoidable to draw nearby particles into the flow path of the engine, including birds, ice, and small hard objects
Peters et al [6] used an air cannon to launch steel balls to impact the surface of the Ti-6A1-4V plate and observed the bottom of the notch by a scanning electron microscope (SEM) and found obvious microcrack damage caused by high-speed impact
This paper focuses on the effect of foreign object damage (FOD) on the High-cycle fatigue (HCF) limit of a 1Cr11Ni2W2MoV stainless steel flat plate specimen, as well as on the prediction method for the HCF limit

Summary

Introduction

During the service of aeroengine, it is unavoidable to draw nearby particles into the flow path of the engine, including birds, ice, and small hard objects. The FOD on aeroengine blades is a complex transient dynamic problem, which involves the nonlinearity, contact, and large deformation of materials. The most intuitive way to study the FOD problem is to test the impact damage prefabricated. Peters et al [6] used an air cannon to launch steel balls to impact the surface of the Ti-6A1-4V plate and observed the bottom of the notch by a scanning electron microscope (SEM) and found obvious microcrack damage caused by high-speed impact. Farahani et al [7] carried out ballistic impact tests by air cannon, launching steel foreign objects of different shapes on Udimet-500 nickelbased alloy (the first-stage rotor material of the Fiat gas turbine engine) with different impact velocities and incident angles.

Methods

Results

Conclusion