Effect of phase transformation on ductility of additively manufactured Co-28Cr-6Mo alloy: An in situ synchrotron X-ray diffraction study during mechanical testing

被引：26

作者：

Antunes, L. H. M. ^{[1
]}

Hoyos, J. J. ^{[2
]}

Fonseca, E. B. ^{[1
]}

Beres, M. ^{[3
,4
]}

da Silva Farina, P. F. ^{[1
]}

Lopes, E. S. N. ^{[1
]}

Jardini, A. L. ^{[3
]}

Maciel Filho, R. ^{[3
]}

机构：

[1] Univ Estadual Campinas, Sch Mech Engn, Rua Mendeleyev 200, BR-13083860 Campinas, SP, Brazil

[2] State Univ Ponta Grosso, Mat Engn Dept, Av Gen Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, Brazil

[3] Univ Estadual Campinas, Fac Chem Engn, Natl Inst Biofabricat, Av Albert Einstein 500, BR-13083852 Campinas, SP, Brazil

[4] Univ Fed Ceara, Dept Met & Mat Engn, Av Humberto Monte, BR-60445554 Fortaleza, CE, Brazil

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2019年 / 764卷

基金：

巴西圣保罗研究基金会;

关键词：

CoCrMo alloy; Selective laser melting; Strain induced martensitic transformation; Ductility; In-situ X-ray diffraction; Characterization; CR-MO ALLOY; INDUCED MARTENSITIC-TRANSFORMATION; DIRECT METAL LASER; EPSILON-MARTENSITE; TENSILE PROPERTIES; FATIGUE-STRENGTH; GRAIN-SIZE; MICROSTRUCTURES; TEMPERATURE; BEHAVIOR;

D O I：

10.1016/j.msea.2019.138262

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of strain-induced martensitic transformation on the mechanical properties of a Co-28Cr-6Mo alloy produced using the direct metal laser sintering additive manufacturing technique was analyzed. Both the as-built and solution heat-treated (ST) specimens were subjected to conventional tensile tests. Furthermore, X-ray diffraction spectra were simultaneously acquired using a synchrotron light source. In addition, electron backscatter diffraction analysis was performed on the specimens before and after tensile testing. Both techniques revealed the occurrence of the strain-induced gamma-face-centered cubic -> epsilon-hexagonal close-packed phase transformation. The higher microstrain and preferential grain orientation of the as-built specimen favored the onset of the phase transformation. Moreover, the ductility of the ST specimen was significantly higher than that of the as-built specimen. This behavior was attributed to the isotropic properties of the randomly-oriented and equiaxed grains, increase in resistance to necking, and reduction in internal stresses caused by the solution heat treatment.

引用

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