| 超高强度热冲压用钢中H的扩散与氢致滞后开裂行为 |
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| 引用本文： | 张施琦,黄运华,廖庆亮,赵雷超,洪继要,张跃. 超高强度热冲压用钢中H的扩散与氢致滞后开裂行为[J]. 钢铁研究学报, 2014, 26(8): 47-52. DOI: 10.13228/j.boyuan.issn1001-0963.20130339 |
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| 作者姓名： | 张施琦 黄运华 廖庆亮 赵雷超 洪继要 张跃 |
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| 作者单位： | ［1. 北京科技大学材料科学与工程学院, 北京100083 2. 宝山钢铁股份有限公司研究院, 上海 201900 3. 汽车用钢开发与应用技术国家重点实验室宝钢, 上海 201900 4. 北京科技大学新金属材料国家重点实验室, 北京 100083］ |
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| 摘 要： | 采用阴极充H、恒载荷拉伸和电化学H渗透等试验方法,研究了超高强度钢22MnB5Nb的H扩散行为及氢致滞后开裂性能,并与常用热冲压钢22MnB5进行了对比。结果表明,H在22MnB5Nb钢中的扩散系数为3.02×10-7 cm2/s,显著低于22MnB5钢;与22MnB5钢相比,22MnB5Nb钢具有较好的耐氢致滞后开裂性能;这是由于22MnB5Nb钢晶粒较细小,增加了晶界的有效面积,使H陷阱分布更均匀,进而抑制H向裂纹尖端扩展,避免了局部H的富集。
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| 关 键 词： | 热冲压用钢 氢致滞后开裂 H扩散 |
Hydrogen Diffusion and Hydrogen-Induced Delayed Cracking of Ultra-High Strength Steels for Hot Stamping |
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| ZHANG Shi-qi,HUANG Yun-hua,LIAO Qing-liang,ZHAO Lei-chao,HONG Ji-yao,ZHANG Yue,. Hydrogen Diffusion and Hydrogen-Induced Delayed Cracking of Ultra-High Strength Steels for Hot Stamping[J]. Journal of Iron and Steel Research, 2014, 26(8): 47-52. DOI: 10.13228/j.boyuan.issn1001-0963.20130339 |
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| Authors: | ZHANG Shi-qi HUANG Yun-hua LIAO Qing-liang ZHAO Lei-chao HONG Ji-yao ZHANG Yue |
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| Affiliation: | ??1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China ;2. Research Institute, Baoshan Iron and Steel Co. , Ltd. , Shanghai 201900, China ;3. State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel , Shanghai 201900,China ;4. The State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China?? |
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| Abstract: | Cathodic charging hydrogen, constant load tensile test and electrochemical hydrogen permeation method were used to study the hydrogen permeation and hydrogen-induced delayed cracking of ultra-high strength steels 22MnB5Nb, which were also compared with commercial hot stamping steels 22MnB5. The results show that the diffusion coefficient of hydrogen in 22MnB5Nb is 3. 02×10-7 cm2/s and evidently lower than that in 22MnB5, delayed fracture resistance of 22MnB5Nb is superior to 22MnB5. The reason for this is that the effective area of grain boundary is increased for the refined grain, which lead to more homogeneous distribution of hydrogen trap sites in the sample. Then the permeation of hydrogen to crack tip is hindered and the local enrichment of hydrogen is avoided. |
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| Keywords: | steel for hot stamping hydrogen-induced delayed cracking hydrogen diffusion |
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