Strengthening and Toughening Process Method of 30CrMnSiA Thin-Wall Cup-Shaped Parts

doi:10.12141/j.issn.1000-565X.220075

Abstract

Abstract:

30CrMnSiA thin-wall cup-shaped part is a key basic component widely used in the flexible gear of harmonic reducer. Aiming at the problem of the low bearing capacity and short service life of harmonic reducer caused by insufficient strength and toughness of 30CrMnSiA thin-wall cup-shaped parts manufactured by traditional turning method, this paper proposed a plastic deformation-heat treatment process which consists of spinning, quenching, tempering, spinning and aging to manufacture 30CrMnSiA thin-wall cup-shaped parts with less or no cutting and excellent mechanical properties. Through the tensile and impact experiment, by comparing the mechanical properties of each process part, the microorganization of each process part was analyzed. The results show that tempered sorbite microstructure with high strength can be obtained by spinning-quenching and tempering process, but the plasticity was reduced significantly. The fibrous microstructure of spun parts can be further refined by aging heat treatment, and the fine carbides precipitated and uniformly distributed on the ferrite matrix. High strength and good plasticity can be obtained by subsequent aging at 300 ℃ for 6 h. As compared with parts obtained by turning forming after quenching and tempering heat treatment, the yield strength and tensile strength of 30CrMnSiA thin-wall cup-shaped parts manufactured by plastic deformation and heat treatment are improved by 93.65% and 47.88%, respectively. The hardness is increased by 26.87%, and the impact strength is increased by 12.01%. Meanwhile, the elongation and percentage reduction of area are 11.60% and 24.64%, respectively. The thin-wall cup-shaped parts with high strength and toughness can be manufactured by the plastic deformation and heat treatment process of spinning-quenching-tempering-spinning-aging, which provides a new method for manufacturing the thin-wall cup-shaped parts with high-strength and toughness.

Key words: 30CrMnSiA, thin-wall cup-shaped part, plastic deformation-heat treatment, strengthening and toughening, process method

CLC Number:

TG306

XIA Qinxiang, XIE Zhangxiong, CHEN Can, et al. Strengthening and Toughening Process Method of 30CrMnSiA Thin-Wall Cup-Shaped Parts[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(1): 1-7.

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成分	质量分数/%	成分	质量分数/%
C	0.30	P	0.01
Si	1.08	Ni	0.02
Mn	0.91	Cu	0.01
Cr	0.95	Mo	0.03
S	0.01	Fe	余量

参数	取值	参数	取值
D_R /mm	180	δ_ρ /（°）	25
r_ρ /mm	6	β_ρ /（°）	5
α_ρ /（°）	30	l_ρ /mm	1

道次	f/（mm·r^-1）	ψ_i/%	n/（r·min^-1）	a₁₂/mm	a₂₃/mm	Δt₁/mm	Δt₂/mm	Δt₃/mm
1	0.4	41.7	108	2.4	2.2	0.47	0.41	0.37
2	0.4	39.4	108	2.4	2.2	0.27	0.23	0.19
3	0.4	53.8	108	0	0	0.57	0	0

试样状态	屈服强度/MPa	抗拉强度/MPa	硬度（HV）	断后伸长率/%	断面收缩率/%
退火态毛坯	376.51	604.81	184.60	35.89	42.36
调质态车削件	545.50	792.23	297.40	24.90	42.16
旋压件（第3道次）	973.20	1 139.29	353.60	10.00	20.24
旋压件（时效200 ℃+6 h）	989.06	1 170.03	371.60	10.45	21.40
旋压件（时效225 ℃+6 h）	1 032.60	1 171.83	373.40	10.20	21.08
旋压件（时效250 ℃+6 h）	1 036.36	1 176.51	376.73	10.10	20.64
旋压件（时效275 ℃+6 h）	1 060.76	1 175.07	378.60	11.40	23.58
旋压件（时效300 ℃+6 h）	1 056.38	1 171.53	377.30	11.60	24.64

状态	冲击强度/（kJ·m^-2）	冲击强度变化率/%
调质态车削件	403.27	—
旋压件（第3道次）	355.13	-11.94
旋压件（时效300 ℃+6 h）	451.70	12.01