Effect of specimen size on ductile to brittle transition behavior of martensitic 9Cr steels after various heat treatments

被引:9
|
作者
Abe, F [1 ]
Kayano, H [1 ]
机构
[1] TOHOKU UNIV,INST MAT RES,OARAI BRANCH,OARAI,IBARAKI 31113,JAPAN
关键词
D O I
10.1016/0022-3115(96)00386-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of specimen size on the ductile to brittle transition behavior has been investigated using the full-size and 1/3-size Charpy V-notch specimens of martensitic 9Cr-WVTa steels after quenching, tempering and subsequent prolonged aging treatments. The upper shelf energy (USE) and ductile to brittle transition temperature (DBTT) were widely changed by the heat treatments; the USE varied from 90 to 292 J, and the DBTT from 188 to 325 K. The nominal volume (Bb)(3/2), where B is the specimen thickness and b the ligament size, was effective as a normalization factor for the USE only in the large USE region above 210 and 8.5 J for the full-size and 1/3-size specimens, respectively. A new normalization factor depending on the USE level was proposed. Although the relationship between the DBTT for the full-size and 1/3-size specimens was different from steel to steel, the shift in DBTT caused by the heat treatments was described by Delta DBTT1/3-size = (1.2 +/- 0.1)Delta DBTTfull-size for all the steels examined.
引用
收藏
页码:44 / 51
页数:8
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