Ultrahigh cycle fatigue fracture mechanism of high-quality bearing steel obtained through different deoxidation methods
Ultrahigh cycle fatigue fracture mechanism of high-quality bearing steel obtained through different deoxidation methods
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不同脱氧方法获得的优质轴承钢超高周疲劳断裂机理
DOI：
10.1007/s12613-021-2253-y
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发表时间：
2021-05
期刊：
影响因子：
--
通讯作者：
Guang-tao Sun
中科院分区：
文献类型：
--
作者：
Wei Xiao;Yan-ping Bao;Chao Gu;Min Wang;Yu Liu;Yong-sheng Huang;Guang-tao Sun
通过对经Al（Al脱氧钢）和Si（Si脱氧钢）脱氧的轴承钢进行超声拉压疲劳试验（应力比，R=-1），并分析检测到的夹杂物的特征，阐明了氧化物夹杂物在超高周疲劳（VHCF）区域疲劳裂纹萌生中的机理。结果表明，硅脱氧钢和铝脱氧钢中夹杂物的主要类型分别为硅酸盐和铝酸钙。硅脱氧钢中大于15 µm的铝酸钙夹杂物含量低于铝脱氧钢，这可能是由于冶炼过程中夹杂物生成过程不同所致。尽管它们的清洁度和总氧含量不同，硅脱氧钢和铝脱氧钢显示出相似的VHCF寿命。引起这些钢疲劳破坏的因素显示出明显的差异。铝脱氧钢中的裂纹是由铝酸钙夹杂物引起的。相比之下，大多数Si脱氧钢的疲劳裂纹是由钢基体的不均匀性引发的，这表明钢基体的损伤机制可能是这种类型的钢的关键问题。硅脱氧钢中的一小部分裂纹可归因于不同类型的夹杂物。进一步分析了铝酸钙和硅酸盐夹杂物引起疲劳断裂的机理。铝酸钙夹杂物首先从钢基体中分离出来，然后引发裂纹的产生。硅酸盐夹杂物与钢基体在疲劳过程中结合紧密，对轴承钢的疲劳寿命影响不大。Si/Mn脱氧是生产高质量轴承钢的有效方法，该轴承钢具有较长的疲劳寿命和良好的钢液流动性。
The mechanism of oxide inclusions in fatigue crack initiation in the very-high cycle fatigue (VHCF) regime was clarified by subjecting bearing steels deoxidized by Al (Al-deoxidized steel) and Si (Si-deoxidized steel) to ultrasonic tension-compression fatigue tests (stress ratio,R= −1) and analyzing the characteristics of the detected inclusions. Results show that the main types of inclusions in Si- and Al-deoxidized steels are silicate and calcium aluminate, respectively. The content of calcium aluminate inclusions larger than 15 µm in Si-deoxidized steel is lower than that in Al-deoxidized steel, and the difference observed may be attributed to different inclusion generation processes during melting. Despite differences in their cleanliness and total oxygen contents, the Si- and Al-deoxidized steels show similar VHCF lives. The factors causing fatigue failure in these steels reveal distinct differences. Calcium aluminate inclusions are responsible for the cracks in Al-deoxidized steel. By comparison, most fatigue cracks in Si-deoxidized steel are triggered by the inhomogeneity of a steel matrix, which indicates that the damage mechanisms of the steel matrix can be a critical issue for this type of steel. A minor portion of the cracks in Si-deoxidized steel could be attributed to different types of inclusions. The mechanisms of fatigue fracture caused by calcium aluminate and silicate inclusions were further analyzed. Calcium aluminate inclusions first separate from the steel matrix and then trigger crack generation. Silicate inclusions and the steel matrix are closely combined in a fatigue process; thus, these inclusions have mild effects on the fatigue life of bearing steels. Si/Mn deoxidation is an effective method to produce high-quality bearing steel with a long fatigue life and good liquid steel fluidity.
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DOI：
10.1007/s12613-018-1609-4
发表时间：
2018-05
期刊：
International Journal of Minerals, Metallurgy, and Materials
影响因子：
--
作者：
Chao Gu;Y. Bao;P. Gan;Min Wang;Jin-shan He
通讯作者：
Chao Gu;Y. Bao;P. Gan;Min Wang;Jin-shan He
影响因子：
2.2
作者：
Changji Xuan;A. Karasev;P. Jönsson;K. Nakajima
通讯作者：
Changji Xuan;A. Karasev;P. Jönsson;K. Nakajima
DOI：
10.2355/tetsutohagane1955.80.10_748
发表时间：
1994
影响因子：
0.3
作者：
N. Shinozaki;Nobuo Echida;K. Mukai;Y. Takahashi;Yasukuni Tanaka
通讯作者：
N. Shinozaki;Nobuo Echida;K. Mukai;Y. Takahashi;Yasukuni Tanaka
影响因子：
2.9
作者：
W. Xiao;Min Wang;Y. Bao
通讯作者：
W. Xiao;Min Wang;Y. Bao
影响因子：
0.9
作者：
K. Nogi;K. Ogino
通讯作者：
K. Nogi;K. Ogino