R. Kreethi

Inha University

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Krishna Dutta

National Institute of Technology Rourkela

A.K. Mondal

Indian Institute of Technology BHU

Kee‐Ahn Lee

Inha University

Yongho Sohn

University of Central Florida

Hyungjun Kim

Korea Institute of Civil Engineering and Building Technology

Min-Seok Baek

Inha University

Taehyun Park

Gachon University

Srimant Kumar Mishra

GIET University

P. Sampark

National Institute of Technology Rourkela

Preeti Verma

Banaras Hindu University

Cooperative Institutions

National Institute of Technology Rourkela

Inha University

Andong National University

Banaras Hindu University

Hanyang University

Research Institute of Industrial Science and Technology

Materials Science & Engineering

Indian Institute of Technology BHU

Manipal University Jaipur

Jadavpur University

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Ratcheting induced cyclic softening behaviour of 42CrMo4 steel

IOP Conference Series Materials Science and Engineering (2015)

R. Kreethi A.K. Mondal Krishna Dutta

Ratcheting is an important field of fatigue deformation which happens under stress controlled cyclic loading of materials. The aim of this investigation is to study the uniaxial ratcheting behavior of 42CrMo4 steel in annealed condition, under various applied stresses. In view of this, stress controlled fatigue tests were carried out at room temperature up to 200 cycles using a servo-hydraulic universal testing machine. The results indicate that accumulation of ratcheting strain increases monotonically with increasing maximum applied stress however; the rate of strain accumulation attains a saturation plateau after few cycles. The investigated steel shows cyclic softening behaviour under the applied stress conditions. The nature of strain accumulation and cyclic softening has been discussed in terms of dislocation distribution and plastic damage incurred in the material.

Cyclic stress

Saturation (graph theory)

10.1088/1757-899x/75/1/012027

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Citations (3)

On the comparative assessment of ratcheting-induced dislocation density in 42CrMo4 steel by X-ray diffraction profile analysis and hardness measurement

The Philosophical Magazine A Journal of Theoretical Experimental and Applied Physics (2018)

R. Kreethi Srimant Kumar Mishra A.K. Mondal Krishna Dutta

The phenomenon of ratcheting occurs under the influence of non-zero mean stress during cyclic loading; it singificantly reduces the low cycle fatigue life of engineering structures. The present investigation deals with a detailed comparison on the estimation of dislocation densities in the 42CrMo4 steel induced by ratcheting using two different methods, i.e. X-ray diffraction (XRD) profile analysis and hardness. The dislocation densities in the ratcheted specimens were assessed using XRD profile analysis following the modified Williamson–Hall method as well as hardness measurements following the modified Nix and Gao model. The results showed that dislocation density increased in the ratcheted specimens as compared to the unratcheted ones and increase in accumulation of ratcheting strain was correlated with the increase in dislocation densities in the ratcheted specimens. It was established that both hardness and X-ray diffraction profile analysis methods can very effectively be used to assess the dislocation densities in the ratcheted specimens.

Strain (injury)

10.1080/14786435.2018.1497308

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Citations (10)

Martensitic Transformation During Compressive Deformation of a Non-conventional Stainless Steel and Its Quantitative Assessment

Journal of Materials Engineering and Performance (2015)

R. Kreethi P. Sampark Goutam Kumar Majhi Krishna Dutta

Diffusionless transformation

Austenitic stainless steel

10.1007/s11665-015-1724-6

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Citations (3)

Ratcheting life prediction of quenched–tempered 42CrMo4 steel

Journal of Materials Science (2019)

R. Kreethi Chinnam Sivateja A.K. Mondal Krishna Dutta

Cyclic stress

10.1007/s10853-019-03705-3

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Citations (16)

Ratcheting fatigue behaviour of 42CrMo4 steel under different heat treatment conditions

Materials Science and Engineering A (2016)

R. Kreethi A.K. Mondal Krishna Dutta

Substructure

10.1016/j.msea.2016.10.019

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Citations (42)

Effects of different HVOF thermal sprayed cermet coatings on tensile and fatigue properties of AISI 1045 steel

Journal of Materials Research and Technology (2021)

Gi-Su Ham R. Kreethi Hyungjun Kim Sanghoon Yoon Kee‐Ahn Lee

The objective of the present work was to investigate the effect of different cermet coatings on tensile and high-cycle fatigue properties of AISI 1045 steel using High-Velocity Oxygen Fuel (HVOF) thermal spray process. In this study, the WC-12Co, WC-10Co-4Cr, and Cr3C2–25NiCr cermet powders were coated onto the surface of annealed AISI 1045 steel specimens via the HVOF thermal spray process. The corresponding HVOF thermal spraying results were compared with those obtained from hard chrome (Cr) electroplating process. The thermal spray coated specimens showed load drop tendency beyond the yield point with significant work hardening in the tensile results, but low fatigue life than the base material in high-cycle fatigue results due to defects and poor adhesion at the interface. However, those cermet coating materials showed higher fatigue strengths than the hard chrome plated material. Fractography tests showed that fatigue strength was not only dependent on residual stress, but also influenced by the modes of fatigue failure related to the coated layer's cohesion and adhesion strength. Overall, the Cr3C2–25NiCr cermet coating is preferable due to its less porosity, high fatigue property, and better adhesion than the other coated materials.

Cermet

Fatigue limit

10.1016/j.jmrt.2021.11.102

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Citations (27)

Effect of heat treatment on the impact toughness and thermal properties of the AlSi10Mg alloy manufactured by laser powder bed fusion

Progress in Additive Manufacturing (2023)

R. Kreethi Yongho Sohn Kee‐Ahn Lee

10.1007/s40964-023-00473-0

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Citations (2)

Influence of Heat Treatment on Ratcheting Fatigue Behavior and Post Ratcheting Tensile Properties of Commercial Aluminum