Fatigue strength dependence on the ultimate tensile strength and hardness in magnesium alloys

Li, Zhenming; Wang, Qigui; Luo, Alan A.; Fu, Penghuai; Peng, Liming

doi:10.1016/j.ijfatigue.2015.07.001

Cited by 57 publications

(23 citation statements)

References 61 publications

(120 reference statements)

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“…The liner relationships between fatigue strength and hardness have been reported for different alloys. [34][35][36][37][38][39] Moreover, the hardness measurement can also evaluate the resistance of a material to creep. 40,41 The fatigue and creep resistances of an alloy generally increase with its hardness.…”

Section: Microhardness Measurementsmentioning

confidence: 99%

Experimental investigation on creep‐fatigue behaviours of as‐received and service‐exposed turbine blades: Mechanism and life evaluation

Shi

Yang

et al. 2020

Fatigue Fract Eng Mat Struct

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In the present study, both the as-received and the 600-h-serviced turbine blades were tested under the creep-fatigue loading. The results showed that the service-exposed blades exhibited a longer creep-fatigue life than the asreceived ones due to the refinement of grain size and the increasing of hardness during the service process. Micro structural characterization revealed that there was no directional coarsening or rafting of γ 0 precipitate after 600 h of service. Moreover, the as-received blades exhibited initial cyclic hardening followed by saturation and softening, whereas the 600-h-serviced blades only exhibited continuous softening until fracture. A conservative service life prediction approach was proposed considering the experienced mission profile. This service life estimation method provides a new way to assess the durability of turbine blade.

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Section: Microhardness Measurementsmentioning

confidence: 99%

Experimental investigation on creep‐fatigue behaviours of as‐received and service‐exposed turbine blades: Mechanism and life evaluation

Shi

Yang

et al. 2020

Fatigue Fract Eng Mat Struct

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“…That is to say, the LCF fracture of cast Mg-Al alloys is an intergranular fracture at room temperature [ 17 , 18 , 19 ] but is a hybrid of intergranular and transgranular fracture at the elevated temperature [ 18 ]. Li and Peng et al described also the relationship between the tensile strength, surface hardness, fatigue life and characteristic of cast AZ91D [ 20 ]. Horstemeyer’s group investigated the high cycle fatigue problems of cast AM50 and AZ91 E-T4 magnesium alloys and simulated the fatigue crack growth in a die-cast AM50 magnesium alloy based on the micro analysis method [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology

Wang

Tan

et al. 2018

Materials

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The low cycle fatigue tests on the crack initiation and propagation of cast magnesium alloys with two small holes were carried out by using in-situ scanning electron microscope (SEM) observation technology. The fatigue crack propagation behaviors and fatigue life, which are affected by two small artificial through holes, including the distances between two holes and their locations, were discussed in detail based on the experimental results and the finite element analysis (FEA). The results indicated that the fatigue multi-cracks occurred chiefly at the edges of two holes and the main crack propagation was along the weak dendrite boundary with the plastic deformation vestiges on the surface of α-Mg phase of cast AM50 and AM60B alloys. The fatigue cracking characteristics of cast AZ91 alloy depended mainly on the brittle properties of β-Mg17Al12 phase, in which the multi-cracks occurred still at the edges of two holes and boundaries of β-Mg17Al12 phase. The fatigue crack initiation position of cast magnesium alloys depends strongly on the radius of curvature of through hole or stress concentration factor at the closed edges of two through holes. In addition, the fatigue multi-cracks were amalgamated for the samples with titled 45° of two small holes of cast Mg-Al alloys when the hole distance is less than 4D (D is the diameter of the small hole).

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“…Magnesium alloys are extensively used in aerospace, electronics, military and other industry fields for weight reduction effectiveness [1][2][3]. However, the application of magnesium alloy has been limited by its low absolute strength and poor fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy

Zhao

Zhang

Liu

2017

Metals

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High-frequency impacting and rolling was applied on AZ31B magnesium alloy to obtain a gradient nano-structured surface. Surface characteristics were experimentally investigated, and the nanocrystallization mechanism is discussed in detail. Results showed that the gradient nano-structure with the characteristics of work hardening, compressive residual stress and a smooth surface was induced on the treated surface. Grains on the top surface were generally refined to around 20 nm. Twins, dislocations and dynamic recrystallization dominated the grain refinement process. Fatigue strength of the treated specimens corresponding to 10 7 cycles was increased by 28.6% compared to that of the as-received specimens. The work hardened layer induced by high-frequency impacting and rolling is the major reason to improve fatigue life.

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Fatigue strength dependence on the ultimate tensile strength and hardness in magnesium alloys

Cited by 57 publications

References 61 publications

Experimental investigation on creep‐fatigue behaviours of as‐received and service‐exposed turbine blades: Mechanism and life evaluation

Experimental investigation on creep‐fatigue behaviours of as‐received and service‐exposed turbine blades: Mechanism and life evaluation

Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology

Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy

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