P92钢高温断裂韧性的试验

荆洪阳; 李世波; 徐连勇; 赵雷

doi:10.12073/j.hjxb.2019400033

P92钢高温断裂韧性的试验

荆洪阳^1,2,
李世波^1,2,
徐连勇^1,2,*,,
赵雷^1,2

1. 天津大学材料科学与工程学院，天津　300350;
2. 天津市现代连接技术重点实验室，天津　300350

基金项目:

国家自然科学基金项目(51475326)

详细信息

作者简介:
荆洪阳，男，1966年出生，博士，教授，博士研究生导师. 主要从事焊接结构可靠性评价方面的研究. 发表论文200余篇. Email：hjing@tju.edu.cn

通讯作者:
徐连勇，男，教授. Email：xulianyong@tju.edu.cn

中图分类号: TG 405
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- 文章访问数: 165
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出版历程
- 收稿日期: 2017-10-23

Experimental study on high temperature fracture toughness of P92 steel

JING Hongyang^1,2,
LI Shibo^1,2,
XU Lianyong^1,2,*,,
ZHAO Lei^1,2

1. School of Materials Science and Technology, Tianjin University, Tianjin 300350, China;
2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China

摘要

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J_Q. 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.
- P92钢 /
- 高温断裂韧性 /
- 紧凑拉伸试样 /
- 侧槽 /
- 拘束
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 J_Q 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 T_z 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.
- P92 steel /
- high temperature fracture toughness /
- compact tension specimen /
- side grooves /
- constraint

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参考文献(14)

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