Effect of Aging Temperature on Microstructure and Properties of 00Cr12Ni10MoTi Maraging Stainless Steel

doi:10.11901/1005.3093.2019.151

Chinese Journal of Materials Research

2019, Vol. 33

Issue (11): 815-823 DOI: 10.11901/1005.3093.2019.151

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Effect of Aging Temperature on Microstructure and Properties of 00Cr12Ni10MoTi Maraging Stainless Steel

ZHANG Honglin^1,²,MA Dongping⁴,LIU Rujie^1,³,WANG Taijiang⁴,XU Bin¹,SUN Mingyue¹(

),LI Dianzhong¹,LI Yiyi¹,YU Hui³

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang National Laboratory for Materials Science, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
4. China Aerodynamics Research and Development Center, Mianyang 621000, China

Cite this article:

ZHANG Honglin,MA Dongping,LIU Rujie,WANG Taijiang,XU Bin,SUN Mingyue,LI Dianzhong,LI Yiyi,YU Hui. Effect of Aging Temperature on Microstructure and Properties of 00Cr12Ni10MoTi Maraging Stainless Steel. Chinese Journal of Materials Research, 2019, 33(11): 815-823.

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Abstract

The effect of aging temperature on the microstructure and mechanical properties of 00Cr12Ni10MoTi maraging stainless steel was investigated by means of X-ray diffractometer (XRD), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), tensile tester and impact tester. The results show that the strength increases gradually with the increase of aging temperature, through the enhanced precipitation strengthening. A large amount of rod-like Ni₃Ti precipitated on the matrix when aged at 500℃, which leads the strength of the steel to the peak value. The impact toughness at room temperature and low temperature decreases with the increase of aging temperature, and the lowest impact energy at low temperature (-196℃) is 51 J for the steel aged at 400℃, while the impact toughness of the steel increases again when aging temperature continues rising to 500℃, which is related to the formation of reversed austenite in martensite matrix. The existence of austenite phase can effectively inhibit crack initiation and relieve its propagation. Aging at 500℃ can effectively exert the precipitation strengthening effect of Ni₃Ti and the toughening effect of reversed austenite, achieving better matching of strength and toughness.

Key words: metallic materials 00Cr12Ni10MoTi microstructure aging strengthening Ni₃Ti reversed austenite

Received: 12 March 2019

ZTFLH:

TG142.1

Fund: National Key Research and Development Program(2016YFB0300401);National Natural Science Foundation of China(51774265);Program of CAS Interdisciplinary Innovation Team(ZDRW-CN-2017-1)

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	Articles by authors
	Honglin ZHANG
	Dongping MA
	Rujie LIU
	Taijiang WANG
	Bin XU
	Mingyue SUN
	Dianzhong LI
	Yiyi LI
	Hui YU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.151 OR https://www.cjmr.org/EN/Y2019/V33/I11/815

Table 1 Chemical composition of the tested steel (mass fraction/%)

Fig.1 Effect of aging temperature on mechanical properties of the tested steel (a) yield strength and tensile strength; (b) elongation after fracture and reduction of area; (c) impact energy

Fig.2 Cryogenic impact fracture morphology of the tested steel under different aging temperature (a) 350℃; (b) 400℃; (c) 450℃; (d) 500℃; (e) 550℃

Fig.3 XRD spectra of solid solution state and aging state samples at different temperature (a); Volume fraction of austenite of solid solution state and aging state samples at different temperature (b)

Fig.4 Microstructure of 00Cr12Ni10MoTi samples (a) OM image of solid solution state sample; (b) SEM image of solid solution state sample; (c) OM image of aging state sample at 500℃; (d) SEM image of aging state sample at 500℃

Fig.5 EBSD results of the tested steel under different condition (a) solid solution state; (b) aging state at 500℃

Fig.6 TEM images of the tested steel under different condition (a) bright-field image of solid solution state; (b) bright-field image of aging state at 500℃; (c) bright-field image of precipitates in aging state at 500℃; (d) dark-field (DF) image of precipitates in aging state at 500℃; (e) [011]_M selected area diffraction (SAD) pattern of matrix in aging state at 500℃; (f) schematics of SAD pattern with [011]_M

Fig.7 Equilibrium phase diagram of 00Cr12Ni10MoTi

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