晶粒尺寸对42CrMoVNb钢超高周疲劳性能的影响

金属学报

2009, Vol. 45

Issue (7): 880-886

论文

本期目录 | 过刊浏览

晶粒尺寸对42CrMoVNb钢超高周疲劳性能的影响

张永健^1;2 惠卫军² 项金钟¹ 董瀚² 翁宇庆^2;3

1) 云南大学物理科学技术学院; 昆明 650091
2) 钢铁研究总院先进钢铁材料技术国家工程研究中心; 北京 100081
3) 中国金属学会; 北京 100711

EFFECT OF GRAIN SIZE ON ULTRA--HIGH--CYCLE FATIGUE PROPERTIES OF 42CrMoVNb STEEL

ZHANG Yongjian^1;2 HUI Weijun² XIANG Jinzhong¹ DONG Han² WENG Yuqing^2;3

1) School of Physical Science and Technology; Yunnan University; Kunming 650091
2) National Engineering Research Center of Advanced Steel Technology; Central Iron and Steel Research Institute; Beijing 100081
3) The Chinese Society for Metals; Beijing 100711

引用本文:

张永健惠卫军项金钟董瀚翁宇庆. 晶粒尺寸对42CrMoVNb钢超高周疲劳性能的影响[J]. 金属学报, 2009, 45(7): 880-886.
, . EFFECT OF GRAIN SIZE ON ULTRA--HIGH--CYCLE FATIGUE PROPERTIES OF 42CrMoVNb STEEL[J]. Acta Metall Sin, 2009, 45(7): 880-886.

全文: PDF(1257 KB)

摘要:

研究了不同热处理制度下得到的3种具有不同晶粒尺寸的42CrMoVNb高强度钢的超高周疲劳性能. 结果表明, 超高周疲劳强度和疲劳强度比并不随晶粒尺寸的减小而单调提高, 中等晶粒尺寸的试样具有最高的疲劳强度和疲劳强度比. SEM断口观察表明, 绝大部分试样的疲劳裂纹起源于夹杂物. 随着疲劳断口裂纹源夹杂物处应力强度因子幅ΔK_inc的减小, 疲劳寿命N_f增加; 而在夹杂物周围的粗糙粒状区域(GBF)的应力强度因子幅ΔK_GBF并不随N_f变化而变化, 基本为一常数, 且粗晶粒试样的ΔK_GBF高于细晶粒试样. 这表明, 细化晶粒对高强度钢的超高周疲劳性能有着复杂的影响,存在一个合理的细化晶粒范围.

关键词 ： 42CrMoVNb高强度钢, 晶粒尺寸, 超高周疲劳, 疲劳源, 夹杂物

Abstract：

For low and medium strength steels, grain size has significant effects on their fatigue properties, whereas non--metallic inclusion has no or little effect. In previous work, the effects of grain size on high--cycle fatigue fracture behaviors of 42CrMoVNb high strength steel were studied and illustrated that grain refining has a complicated influence on its fatigue properties. In this paper, the ultra--high--cycle fatigue properties of 42CrMoVNb high strength steel with three kinds of prior austenite grain sizes produced by different heat treatment procedures were studied. Experimental results show that both fatigue strength and fatigue strength ratio don't increase monotonically with the decrease of gain size, and fairly better fatigue properties could be obtained at a medium grain size of 15 μm. SEM observations of fatigue fracture surface reveal that most of fatigue cracks initiated from inclusions and a granular bright facet (GBF) was found in the vicinity around inclusion at cycles beyond about 1×10⁶. Further investigation shows that the stress intensity factor range at crack initiation site of inclusion ΔK_inc trends to decrease gradually with increasing the fatigue life N_f, while the stress intensity factor range at GBF boundary ΔK_GBF keeps almost constant with varying N_f. ΔK_GBF of coarse grain size is higher than that of fine grain size. It could conclude that the effect of grain size on ultra--high--cycle fatigue properties is rather complicated and an appropriate size of prior austenite might be existed.

Key words： 42CrMoVNb high strength steel grain size ultra--high--cycle fatigue fatigue crack initiation site inclusion

收稿日期: 2008-12-02

ZTFLH:

TG111.8

基金资助:

国家重点基础研究发展计划资助项目2004CB619104

作者简介: 张永健, 男, 1982年生, 硕士生

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