Ratcheting Fatigue Behavior of Modified 9Cr?1Mo Steel at Room Temperature

Prerna Mishra; R. S. Rajpurohit; N. C. Santhi Srinivas; G. V. S. Sastry; Vakil Singh

doi:10.1007/s12540-020-00811-9

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저자정보: Prerna Mishra (Indian Institute of Technology (Banaras Hindu University)) R. S. Rajpurohit (CSIR-National Metallurgical Laboratory) N. C. Santhi Srinivas (Indian Institute of Technology (Banaras Hindu University)) G. V. S. Sastry (Indian Institute of Technology (Banaras Hindu University)) Vakil Singh (Indian Institute of Technology (Banaras Hindu University))

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.12

발행연도: 2021.12

수록면: 4,922 - 4,936 (15page)

DOI: 10.1007/s12540-020-00811-9

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Fusion reactor components undergo asymmetric cyclic loading,that leads to a progressive increase in plastic strain andcauses deterioration in life of engineering components. This investigation deals with fatigue behavior of modified 9Cr?1Mosteel at room temperature and presents the effect of mean stress (σm), stress amplitude (σa) and stress rate ( ? ) on fatigue life,deformation and fracture behavior under asymmetric cyclic loading. A series of fatigue tests were conducted under asymmetricstress-controlled loading with different combinations of σm (190?210 MPa), σa (400?420 MPa) and ? (50?450 MPa/s). The plastic strain increased with increase in σm and σa and the fatigue life was reduced, whereas increase in ? reduced theaccumulated plastic strain and the cyclic life was increased. The deformation behavior and microstructural changes under theinfluence of the three parameters (σm, σa and ? ) were examined by tranmission electron microscope (TEM). With increasein the three parameters (σm, σa, ? ), the lath martensitic structure changed to subgrain structure along with dislocation cellsand forest dislocations. Scanning electron microscopy revealed unique features of fractured specimens, with progressivereduction in diameter towards the fracture-end, fatigue striations on the tapered circumferential surface and dimples on thefracture surface.

#Ratcheting fatigue #Modified 9Cr?1Mo steel #Mean stress #Stress amplitude #Stress rate

참고문헌 (49)

참고문헌 신청

V. T. Paul / 2008 / J. Nucl. Mater

Vani Shankar / 2006 / Low cycle fatigue behavior and microstructural evolution of modified 9Cr–1Mo ferritic steel / Materials Science and Engineering: A 437(2):413~422

A. Nagesha / 2012 / Isothermal and thermomechanical fatigue studies on a modified 9Cr–1Mo ferritic martensitic steel / Materials Science and Engineering: A 554:95~104

Bimal Das / 2019 / Understanding strain controlled low cycle fatigue response of P91 steel through experiment and cyclic plasticity modeling / Fusion Engineering and Design 138:125~137

M. Atkins / 1980 / Am. Soc. Met 1980:260

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