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

working condition	η	K ₁/10^-5	T _p/MPa	K ₂/10^-5	R ²
Cold-drawing	0.42	7.99	359	25.40	0.94
	0.81	9.22	535	24.84	0.91
	1.21	10.36	652	24.28	0.93
	1.64	4.10	1021	28.64	0.94
	2.41	5.66	1299	33.22	0.95
	3.04	4.66	1251	21.46	0.92
Aging	0.42	8.24	393	23.99	0.93
	0.81	7.78	730	24.59	0.93
	1.21	4.71	988	26.31	0.95
	1.64	3.69	1161	23.01	0.87
	2.41	3.70	1416	34.14	0.95
	3.04	4.69	1922	51.45	0.95

Table 2 Nonlinear（PWL2） fitting results of A_t of 07Cr17Ni7Al wire

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