Journal of Materials Engineering

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Evolution of microstructure and properties of cold-drawn 07Cr17Ni7Al ultrafine wire

Qinsheng HE, Jianqiao WANG, Zhen ZHAO, Fang LI, Shiqing ZHANG, Hong WANG, Xingzheng ZOU, Yuanshou TANG, Min HUANG, Jing LI

Journal of Materials Engineering, 2025, 53(3): 83-94. DOI: 10.11868/j.issn.1001-4381.2023.000785

Material	C	Si	Mn	P	S	Cr	Ni	Al	Cu	Fe
GJB 3320—1998	0.05-0.09	≤0.60	≤1.00	≤0.035	≤0.025	16.00-18.00	6.80-7.75	0.75-1.50	≤0.50	Bal.
Experimental materials	0.074	0.30	0.53	0.0028	<0.001	16.96	7.48	1.21	0.022	Bal.

Table 1 Chemical compositions of 07Cr17Ni7Al for experiment（mass fraction/%）

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Fig.1 Metallographic photos of solution treated 07Cr17Ni7Al wire（a）OM metallographic photo；（b）δ-ferrite identification analysis
Fig.2 Mechanical properties of 07Cr17Ni7Al wire at room temperature（a）engineering stress-strain curves of cold-drawn wire；（b）work hardening curve and true stress-strain curve of cold-drawn wire；（c）engineering stress-strain curves of aged wire；（d）work hardening curve and true stress-strain curve of aged wire
Fig.3 A_t of 07Cr17Ni7Al wire （a）cold-drawn wire；（b）aged wire
Table 2 Nonlinear（PWL2） fitting results of A_t of 07Cr17Ni7Al wire
Fig.4 Comparison of A_t between cold-drawn and aged 07Cr17Ni7Al wire（a）η=0.42；（b）η=0.81；（c）η=1.21；（d）η=1.64；（e）η=2.41；（f）η=3.04 （a）η=0.42；（b）η=0.81；（c）η=1.21；（d）η=1.64；（e）η=2.41；（f）η=3.04
Table 3 A_t applying a stress of 931 MPa
Fig.5 Volume fraction of deformation-induced martensite in 07Cr17Ni7Al wire（a）XRD pattern；（b）volume fraction of deformation-induced martensite and stress sensitivity of martensitic transformation
Fig.6 Microstructures of annealed 07Cr17Ni7Al wire（a）low magnification；（b），（c）enlarged areas of fig.（a）；（d）high magnification
Fig.7 Microstructures of cold drawn （η=2.41） 07Cr17Ni7Al wire （a）low magnification；（d）high magnification
Fig.8 Mechanical behavior of 07Cr17Ni7Al wire with different cold-drawn equivalent strain（a）true strain of the maximum point of the work hardening curve；（b）strain hardening index；（c）tensile strength；（d）tensile strength D-value before and after aging treatment
Table 4 Elastic limit of 07Cr17Ni7Al wire
Fig.9 Elastic properties of 07Cr17Ni7Al wire （a）effect of cold-drawn equivalent strain on T _p；（b）effect of cold-drawn equivalent strain on σ_0.0075
Fig.10 Effect of V _DIM on σ _b，σ _0.0075 and T _p （a）cold-drawing；（b）aging

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