旋转加速喷丸处理18CrNiMo7-6钢的微观结构与力学性能

doi:10.11896/j.issn.1005-023X.2018.10.014

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (5228KB)
Export: BibTeX | EndNote (RIS)

Abstract In the present work, normalized and high temperature tempered 18CrNiMo7-6 steel was firstly subjected to rotationally accelerated shot peening (RASP) processing, which was a low-cost and efficient severe plastic deformation (SPD) technique to produce nanostructured surface-layers of metals. The microstructure of the steel after RSAP processing was characterized by optical microscopy (OM), scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD) techniques, and the mechanical properties were analyzed by microhardness measurements and tensile testing. Simultaneously, the effects of RASP parameters on the microstructural evolution and mechanical properties were analyzed. It is found that RASP successfully produced a steel with structural gradient and it had a obviously microhardness gradient form surface to the inner. Varying the shot peening velocity was an effective way to control the microstructure,while micro-cracks formed easily at the long shot peening time. With a peening velocity of 40 m/s and a peening time of 5 min,the sample had a harden surface without defects and the yield strength was improved by 57% to 512 MPa.

Key words： rotationally accelerated shot peening 18CrNiMo7-6 steel microstructure mechanical properties gradient structure

Published: 06 July 2018

CLC number:

TG178

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHU Min
	WU Guilin
	LI Yusheng
	HUANG Xiaoxu

Cite this article:

ZHU Min,WU Guilin,LI Yusheng, et al. Microstructure and Mechanical Properties of 18CrNiMo7-6 Steel Processed by Rotationally Accelerated Shot Peening[J]. Materials Reports, 2018, 32(10): 1645-1649.

URL:

http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.10.014 OR http://www.mater-rep.com/EN/Y2018/V32/I10/1645

1 Fang T H, Li W L, Tao N R, et al. Revealing extraordinary intrinsic tensile plasticity in gradient nano-grained copper[J]. Science,2011,331:1587.
2 Cui X P, Qin C, Ji C T, et al. surface nanocrystallization of 0Cr21Mn17Mo2NbN0.83 high-nitrogen austenitic stainless steel induced by mechanical attrition & grinding treatment[J]. Materials Review B:Research Papers,2016,30(6):1(in Chinese).
崔晓鹏,秦超,季长涛,等.机械压磨诱导0Cr21Mn17Mo2NbN0.83高氮奥氏体不锈钢表面纳米化[J].材料导报:研究篇,2016,30(6):1.
3 Gao B, Wang J, Li L H, et al. Study on the structural property of surface mechanical pressure-torsion[J]. Materials Review B:Research Papers,2015,29(3):107(in Chinese).
高波,王进,李丽华,等.金属表面机械扭压处理组织性能研究[J].材料导报:研究篇,2015,29(3):107.
4 Ba D M, Ma S N, Meng F J, et al. Friction and wear behaviors of nanocrystalline surface layer of chrome-silicon alloy steel[J]. Surface and Coatings Technology,2007,202(2):254.
5 Roland T, Retraint D, Lu K, et al. Enhanced mechanical behavior of a nanocrystallised stainless steel and its thermal stability[J]. Materials Science and Engineering: A,2007,445:281.
6 Wu X L, Jiang P, Chen L, et al. Extraordinary strain hardening by gradient structure[J]. Proceedings of the National Academy of Sciences,2014,111(20):7197.
7 Wei Y, Li Y, Zhu L, et al. Evading the strength-ductility trade-off dilemma in steel through gradient hierarchical nanotwins[J]. Nature Communications,2014,5:3580.
8 Liu G, Lu J, Lu K. Surface nanocrystallization of 316L stainless steel induced by ultrasonic shot peening[J]. Materials Science & Engineering A,2000,286(1):91.
9 Altenberger I, Scholtes B, Martin U, et al. Cyclic deformation and near surface microstructures of shot peened or deep rolled austenitic stainless steel AISI 304[J]. Materials Science & Engineering A,1999,264(1-2):1.
10 Nikitin I, Altenberger I, Maier H J, et al. Mechanical and thermal stability of mechanically induced near-surface nanostructures[J]. Materials Science & Engineering A,2005,403(1):318.
11 Majzoobi G H, Azadikhah K, Nemati J. The effects of deep rolling and shot peening on fretting fatigue resistance of aluminum-7075-T6[J]. Materials Science & Engineering A,2009,516(1):235.
12 Luo K Y, Lu J Z, Zhang Y K, et al. Effects of laser shock proces-sing on mechanical properties and micro-structure of ANSI 304 austenitic stainless steel[J]. Materials Science & Engineering A,2011,528(13):4783.
13 Zhang B H, Zhang X N. Fabrication of nano titanium and its biomechanical property[J]. Materials Review,2007,21(4):129(in Chinese).
张保华,张小农.SMAT纳米钛的组织及力学性能研究[J].材料导报,2007,21(4):129.
14 Chen X H, Lu J, Lu L, et al. Tensile properties of a nanocrystalline 316L austenitic stainless steel[J]. Scripta Materialia,2005,52(10):1039.
15 Wang L M, Wang Z B, Lu K. Grain size effects on the austenitization process in a nanostructured ferritic steel[J]. Acta Materialia,2011,59(9):3710.
16 Li W L, Tao N R, Lu K. Fabrication of a gradient nano-micro-structured surface layer on bulk copper by means of a surface mechanical grinding treatment[J]. Scripta Materialia,2008,59(5):546.
17 Li C, Cui W, Zhang Y. Surface self-nanocrystallization of α+ β titanium alloy by surface mechanical grinding treatment[J]. Metals and Materials International,2017,23(3):512.
18 Wang X, Li Y S, Zhang Q, et al. Gradient structured copper by rotationally accelerated shot peening[J]. Journal of Materials Science & Technology,2017,33(7):758.
19 Liu J X, He Z J, Wang L H, et al. Study on the durable factors of the grain size in 18CrNiMo7-6 by heating and cooling method[J]. Advanced Materials Research,2011,194-196:228.20 Krawczyk J, Pawlowski B, Bala P. Banded microstructure in forged 18CrNiMo7-6 steel[J]. Metallurgy & Foundry Engineering,2009,35(1):45.
21 Dai R Y, Yu Z Q, Liu Z W, et al. Shot peening treatment and cha-racterization of 18CrNiMo7-6 steel after carburizing and quenching[J].Materials for Mechanical Engineering, 2013,37(5):100(in Chinese).
戴如勇,于中奇,刘忠伟,等.渗碳淬火18CrNiMo7-6钢的表面喷丸强化及表征[J].机械工程材料,2013,37(5):100.
22 Fu P, Zhan K, Jiang C. Micro-structure and surface layer properties of 18CrNiMo7-6 steel after multistep shot peening[J]. Materials & Design,2013,51(5):309.
23 Fu P, Jiang C. Residual stress relaxation and micro-structural deve-lopment of the surface layer of 18CrNiMo7-6 steel after shot peening during isothermal annealing[J]. Materials & Design,2014,56(4):1034.
24 Fu P, Jiang C, Ji V. Microstructural evolution and mechanical response of the surface of 18CrNiMo7-6 steel after multistep shot peening during annealing[J]. Materials Transactions,2013,54(12):2180.