明治大学学術フロンティア信頼性データバンク：高炭素クロム鋼SUJ2の回転曲げ疲労特性データシート(HRC30)

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SUJ2(HRC60)

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高炭素クロム鋼SUJ2の回転曲げ疲労特性データシート

Table.1 Heat treatment conditions of SUJ2 steel

Hardness	Normalizing	Quenching	Tempering
HRC30	-	830℃/20min	170℃/120min

Table.2 Chemical composition

		C	Si	Mn	P	S	Cr	Mo	Ni	Cu
Product analysis		0.98	0.18	0.37	0.016	0.003	1.42	0.03	0.07	0.12
Requirement	Max	1.10	0.35	0.50	0.03	0.03	1.60	0.08	-	-
Requirement	Min	0.95	0.15				1.30

PARTICULARS　FOR　MECHANICAL　P-S-N TEST

Table.3 Test machine properties

Machine type	4-point rotating bending
Motor	φ3-2p-0.75kw
Frequency	0~80Hz

Table.4 Test piece properties

Hardness	HRC30
Geometry

Table.5 Parameter of Log-normal

Stress[GPa]	0.72	0.68	0.64	0.62	0.61	0.60
μ	10.4	11.3	11.7	12.0	12.1	12.2
σ	0.26	0.18	0.31	0.32	0.32	0.34
δ=σ/μ	0.025	0.016	0.026	0.026	0.027	0.027

Table.6 Parameter of 2-parameter Weibull

Stress[GPa]	0.72	0.68	0.64	0.62	0.61	0.60
m	4.6	7.09	3.93	3.65	3.62	3.43
η(×10⁶)	0.35	0.84	1.43	1.89	2.00	2.45

Table.7 Parameter of 3-parameter Weibull

Stress[GPa]	0.72	0.68	0.64	0.62	0.61	0.60
m	1.5
η(×10⁶)	1.37	2.03	6.15	9.28	9.79	12.8
η(×10⁵)	2.01	6.08	7.45	8.76	9.30	1.05

Table.8 Number of cycle to failures of rotating bending fatigue testfor SUJ2 steel HRC30(×10³)

No	Stress[GPa]
No	0.72	0.68	0.64	0.62	0.61	0.60	0.58
1	37	90	113	211	284	200	137135
2	26	84	162	147	227	148	370035
3	25	73	87	277	163	244	455692
4	18	71	151	146	157	157
5	26	70	112	137	136	180
6	43	52	101	254	185	239
7	31	89	123	170	142	154
8	27	74	91	173	139	174
9	31	81	184	155	117	149
10	32	94	172	120	156	155
11	55	85	86	115	125	442
12	28	65	187	131	284	199
13	31	92	116	171	163	209
14	27	100	110	176	311	318
15	34	83	93	158	130	155
16	31	90	136	126	141	260
17	45	68	136	116	135	276
18	29	82	73	147	175	321
19	35	64	168	320	208	176
20	34	68	179	148	218	218

Fig. 1 Life distribution and Log-normal plot, and Log-normal-based P-S-N curve

Fig. 1 Life distribution and Log-normal plot, and Log-normal-based P-S-N curve

Fig. 2　Life distribution and Weibull plot, and 2-parameter Weibull-based P-S-N curve

Fig. 2　Life distribution and Weibull plot, and 2-parameter Weibull-based P-S-N curve

Fig. 3 Life distribution and Weibull plot, and 3-parameter Weibull-based P-S-N curve

Fig. 3 Life distribution and Weibull plot, and 3-parameter Weibull-based P-S-N curve

Fig.4 Fatigue failure of 4-point rotating bending test specimen, SUJ2 HRC30(×10)

Fig.4 Fatigue failure of 4-point rotating bending test specimen, SUJ2 HRC30(×10)

Fig.5 Fatigue failure of 4-point rotating bending test specimen, SUJ2 HRC30　(×50)

Fig.5 Fatigue failure of 4-point rotating bending test specimen, SUJ2 HRC30　(×50)