| P92钢高温断裂韧性的试验 |
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| 引用本文： | 荆洪阳, 李世波, 徐连勇, 赵雷. P92钢高温断裂韧性的试验[J]. 焊接学报, 2019, 40(2): 8-12. DOI: 10.12073/j.hjxb.2019400033 |
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| 作者姓名： | 荆洪阳 李世波 徐连勇 赵雷 |
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| 作者单位： | 天津大学 材料科学与工程学院,天津 300350;天津市现代连接技术重点实验室,天津 300350;天津大学 材料科学与工程学院,天津 300350;天津市现代连接技术重点实验室,天津 300350;天津大学 材料科学与工程学院,天津 300350;天津市现代连接技术重点实验室,天津 300350;天津大学 材料科学与工程学院,天津 300350;天津市现代连接技术重点实验室,天津 300350 |
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| 基金项目： | 国家自然科学基金项目(51475326) |
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| 摘 要： | 文中以P92耐热钢为研究对象，研究了不同尺寸的开侧槽和不开侧槽的紧凑拉伸试样在630 °C下的断裂韧性，得到了相应的的阻力曲线及断裂韧度JQ. P92钢在高温下为典型的韧性断裂机制. 基于三维有限元计算对侧槽的拘束效应进行表征，结果表明，侧槽可明显提高试样的拘束水平，试样尺寸越小，J阻力曲线差异越明显. 随载荷增大，非侧槽试样的拘束变化更明显，开侧槽将导致试样阻力曲线不同. 试样尺寸及结构的改变，对韧性材料的阻力曲线影响较大，而对断裂韧度值影响较小. 试样开侧槽之后裂纹扩展更平齐，可优化断裂韧性试验过程.
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| 关 键 词： | P92钢 高温断裂韧性 紧凑拉伸试样 侧槽 拘束 |
| 收稿时间： | 2017-10-24 |
Experimental study on high temperature fracture toughness of P92 steel |
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| JING Hongyang, LI Shibo, XU Lianyong, ZHAO Lei. Experimental study on high temperature fracture toughness of P92 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(2): 8-12. DOI: 10.12073/j.hjxb.2019400033 |
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| Authors: | JING Hongyang LI Shibo XU Lianyong ZHAO Lei |
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| Affiliation: | 1. School of Materials Science and Technology, Tianjin University, Tianjin 300350, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China |
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| Abstract: | In this paper, a new type of heat-resistant steel, P92 was used as the research object, and the fracture toughness at 630 °C high temperature was studied by using different kinds size of side-grooved and plain-sided of compact tension(CT) specimens. The resistance curves and the corresponding fracture toughness JQ of the specimens under different forms were obtained. Through the analysis of fracture morphology, the fracture toughness of P92 steel at high temperature is good, which is a typical ductile fracture mechanism. Based on the three-dimensional finite element calculation, the influence of the side-groove on the constraint of the specimen was characterized by constraint parameter Tz and Q, through which the effect of the constraint on the experimental results was discussed. Research shows that, side-groove can significantly increase the constraint level of the specimen, and the smaller the size of the specimen, the more obvious the effect of the side-groove, so the smaller the size of the specimen, the more obvious the difference between the J resistance curve; with the increase of load, plain-sided specimen''s constraint change is more obvious, so side-groove structure will lead to different resistance curve; the change of the size or structure of specimens has a great influence on the resistance curve of the ductile material, but the effect on the fracture toughness value is small. After the side-grooved, the crack propagation is more uniform and the fracture toughness test process can be optimized. |
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| Keywords: | P92 steel|high temperature fracture toughness|compact tension specimen|side grooves|constraint |
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