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Optimizing the fatigue strength of 18Ni maraging steel through ageing treatment
Wang, B.; Zhang, P.; Duan, Q. Q.; Zhang, Z. J.; Yang, H. J.; Li, X. W.; Zhang, Z. F.; Zhang, ZF (reprint author), Northeastern Univ, Minist Educ, Sch Mat Sci & Engn, Dept Mat Phys & Chem, Shenyang 110819, Liaoning, Peoples R China.; Zhang, ZF (reprint author), Northeastern Univ, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China.; Zhang, P; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
2017-11-07
Source PublicationELSEVIER SCIENCE SA
ISSN0921-5093
Volume707Pages:674-688
AbstractIt is confirmed that the fatigue strength of high-strength metals would not continuously increase as the tensile strength enhances. In order to find out the optimal fatigue strength of maraging steel, the tensile and cyclic pull push (R = -1) loading tests of 18Ni maraging steel (250 grade) aged under different conditions were carried out in the present study. Meanwhile, the fracture surface and microstructural differences were also investigated. It is detected that decreasing the ageing temperature can bring about the decrement in interparticle spacing and austenite fraction, which would further improve the tensile strength and change the tensile fracture mode. Increasing tensile strength can effectively improve the fatigue strength in the low-strength region. However, as the strength further increases, the intergranular fracture would happen, which means intense deformation in homogeneity at grain boundaries, contrarily causing the decrement in fatigue strength. Finally, it is believed that the optimal fatigue strength can be obtained in the high-strength region where there is a transition in the fracture mode. Moreover, it is found that the specimen aged at 550 degrees C for 5 h with an ultimate tensile strength of 1838 MPa exhibiting the transgranular fracture possesses the highest fatigue strength of 685 MPa.; It is confirmed that the fatigue strength of high-strength metals would not continuously increase as the tensile strength enhances. In order to find out the optimal fatigue strength of maraging steel, the tensile and cyclic pull push (R = -1) loading tests of 18Ni maraging steel (250 grade) aged under different conditions were carried out in the present study. Meanwhile, the fracture surface and microstructural differences were also investigated. It is detected that decreasing the ageing temperature can bring about the decrement in interparticle spacing and austenite fraction, which would further improve the tensile strength and change the tensile fracture mode. Increasing tensile strength can effectively improve the fatigue strength in the low-strength region. However, as the strength further increases, the intergranular fracture would happen, which means intense deformation in homogeneity at grain boundaries, contrarily causing the decrement in fatigue strength. Finally, it is believed that the optimal fatigue strength can be obtained in the high-strength region where there is a transition in the fracture mode. Moreover, it is found that the specimen aged at 550 degrees C for 5 h with an ultimate tensile strength of 1838 MPa exhibiting the transgranular fracture possesses the highest fatigue strength of 685 MPa.
description.department[wang, b. ; li, x. w. ; zhang, z. f.] northeastern univ, minist educ, sch mat sci & engn, dept mat phys & chem, shenyang 110819, liaoning, peoples r china ; [wang, b. ; li, x. w. ; zhang, z. f.] northeastern univ, minist educ, key lab anisotropy & texture mat, shenyang 110819, liaoning, peoples r china ; [wang, b. ; zhang, p. ; duan, q. q. ; zhang, z. j. ; yang, h. j. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china
Keyword18ni Maraging Steel Ageing Treatment Tensile Strength Fracture Mode Fatigue Strength
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Key R & D Program of China [2017YFB0703002]; National Natural Science Foundation of China (NSFC) [51231002, 51571058, 51331007, U1664253]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78987
Collection中国科学院金属研究所
Corresponding AuthorZhang, ZF (reprint author), Northeastern Univ, Minist Educ, Sch Mat Sci & Engn, Dept Mat Phys & Chem, Shenyang 110819, Liaoning, Peoples R China.; Zhang, ZF (reprint author), Northeastern Univ, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China.; Zhang, P; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Wang, B.,Zhang, P.,Duan, Q. Q.,et al. Optimizing the fatigue strength of 18Ni maraging steel through ageing treatment[J]. ELSEVIER SCIENCE SA,2017,707:674-688.
APA Wang, B..,Zhang, P..,Duan, Q. Q..,Zhang, Z. J..,Yang, H. J..,...&Zhang, ZF .(2017).Optimizing the fatigue strength of 18Ni maraging steel through ageing treatment.ELSEVIER SCIENCE SA,707,674-688.
MLA Wang, B.,et al."Optimizing the fatigue strength of 18Ni maraging steel through ageing treatment".ELSEVIER SCIENCE SA 707(2017):674-688.
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