EFFECT OF IMPURITY LEVEL AND NORMALIZING CONDITION ON CREEP RUPTURE BEHAVIOR OF 2.25CR-1MO STEEL THICK WELD JOINT

被引：0

作者：

Tezuka, Hideshi ^{[1
]}

Kato, Hideto ^{[1
]}

机构：

[1] Tokyo Elect Power Co Holdings Inc, Tokyo, Japan

来源：

JOINT EPRI - 123HIMAT INTERNATIONAL CONFERENCE ON ADVANCES IN HIGH-TEMPERATURE MATERIALS, 2019 | 2019年

关键词：

DAMAGE;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two materials with different purity of 2.25Cr-1Mo steel thick weld joint were prepared and creep rupture behavior was investigated by large sized specimens. For high purity material, two types of challenging heat treatment was tried to modify the original microstructural conditions. Weld joints were made and large sized creep test specimens were machined. Creep tests were performed at 903K, 40MPa. Specimen made from low purity material fractured at fine grained heat affected zone (FGHAZ) and showed so-called Type IV cracking. On the other hand, specimen made from high purity material showed maximum creep damage at weld metal. In the case of specimens applied challenging heat treatment, remarkably high ductility were observed at fracture. Regarding 2.25Cr-IMo steel, it was confirmed that the suppression of Type IV cracking had been basically achieved by past improvement on purity level. At the same time, improvement of heat treatment condition was found to have further effect. Because of improved creep properties of high purity material, properties of weld metal had rose up to be the next issue to be examined. At least, taking care on layout design of weld beads to avoid creating wide spread fine grained portion is desired.

引用

页码：162 / 173

页数：12

共 6 条

[1]

Kawakami S., 1993, P 1993 ANN M JSME MA, P508

[2] A trigger of type IV damage and a new heat treatment procedure to suppress it. Microstructural investigations of long-term ex-service Cr-Mo steel pipe elbows [J].