20CrNi2MoA渗碳淬火齿轮弯曲疲劳可靠度研究
20CrNi2MoA삼탄쉬화치륜만곡피로가고도연구
Reliability of Gear-tooth Bending Fatigue Strength for 20CrNi2MoA Steel Gear of Carburization-quench Hardening
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