Effect of heat treatments on pore morphology and microstructure of laser additive manufactured parts

被引：25

作者：

Zhang B. ^{[1
]}

Meng W.J. ^{[1
]}

Shao S. ^{[1
]}

Phan N. ^{[2
]}

Shamsaei N. ^{[3
,4
]}

机构：

[1] Department of Mechanical and Industrial Engineering, Louisiana State University, Baton Rouge, LA

[2] Structures Division, Naval Air Systems Command (NAVAIR), Patuxent River, MD

[3] Department of Mechanical Engineering, Auburn University, Auburn, AL

[4] National Center for Additive Manufacturing Excellence (NCAME), Auburn University, Auburn, AL

来源：

Material Design and Processing Communications | 2019年 / 1卷 / 01期

基金：

美国国家科学基金会;

关键词：

additive manufacturing; heat treatment; hot isostatic pressing (HIP); lack of fusion; porosity;

D O I：

10.1002/mdp2.29

中图分类号：

学科分类号：

摘要：

The slit-shaped, lack-of-fusion pores (LFPs) persistent in the additively manufactured (AM) metals are detrimental to their fatigue resistance due to the associated stress concentrations at the edges. Postbuild treatments, such as hot isostatic pressing (HIP), are routinely used to eliminate pores resulting in, however, inconsistent improvements in fatigue performance. This work critically examines the effectiveness of HIP to eliminate such pores in AM Ti-6Al-4V. In addition, conventional heat treatment (HT) is proposed as a candidate remedial process to alleviate the harmful effects of the LFPs. Specifically, the spheroidization effect of HT on the sharp edges of the LFPs is investigated. Lastly, the effect of HT and HIP on the microstructure is carefully analyzed, safeguarding the beneficial refined microstructure of AM Ti-6Al-4V. © 2019 John Wiley & Sons, Ltd.

引用

共 38 条

[1]

Gu D.D., Meiners W., Wissenbach K., Poprawe R., Laser additive manufacturing of metallic components: materials, processes and mechanisms, Int Mater Rev, 57, 3, pp. 133-164, (2012)

[2]

Frazier W.E., Metal additive manufacturing: a review, J Mater Eng Perform, 23, 6, pp. 1917-1928, (2014)

[3]

Johnson A.S., Shao S., Shamsaei N., Thompson S.M., Bian L., Microstructure, fatigue behavior, and failure mechanisms of direct laser-deposited Inconel 718, JOM, 69, 3, pp. 597-603, (2017)

[4]

Liu W.K., Cheng P., Kafka O.L., Xiong W., Liu Z., Wentao Y., Et al., Linking process, structure, and property in additive manufacturing applications through advanced materials modelling, pp. 23-39, (2015)

[5]

Smith J., Xiong W., Yan W., Et al., Linking process, structure, property, and performance for metal-based additive manufacturing: computational approaches with experimental support, Comput Mech, 57, 4, pp. 583-610, (2016)

[6]

Seifi M., Gorelik M., Waller J., Et al., Progress towards metal additive manufacturing standardization to support qualification and certification, JOM, 69, pp. 439-455, (2017)

[7]

Seifi M., Salem A.A., Satko D.P., Ackelid U., Semiatin S.L., Lewandowski J.J., Effects of HIP on microstructural heterogeneity, defect distribution and mechanical properties of additively manufactured EBM Ti-48Al-2Cr-2Nb, J Alloys Compd, 729, pp. 1118-1135, (2017)

[8]

Yamashita Y., Murakami T., Mihara R., Okada M., Murakami Y., Defect analysis and fatigue design basis for Ni-based superalloy 718 manufactured by selective laser melting, Int J Fatigue, 117, pp. 485-495, (2018)

[9]

Razavi S., Bordonaro G., Ferro P., Torgersen J., Berto F., Porosity effect on tensile behavior of Ti-6Al-4V specimens produced by laser engineered net shaping technology, J Mech Eng Sci, (2018)

[10]

Razavi S., Bordonaro G., Ferro P., Torgersen J., Berto F., Fatigue behavior of porous Ti-6Al-4V made by laser-engineered net shaping, Materials (Basel), 11, 2, (2018)

← 1 2 3 4 →