S.C Liu(Research Institute for Fracture Technology Faculty of Engineering
,
Tohoku University
,
Sendai
,
Japan
,
on leave from Dalian Railway Institute
,
Dalian 116028
,
China)II-Hyun Kown
,
T Hashida and H Takahashi(Research Institute for nacture Technology
,
Faculty of Engineering
,
Tohoku Univeristy
,
Sendai
,
Japan)
金属学报(英文版)
In order to evaluate the tendency of mechanical properties degrudation due to weld-ing and other processing in materials used for supporting coils in super conducting rnaguets utilized in thermonuclear jusion reactore, a small punch (SP) test was used.This test, which was originally developed to study irradiation damage using miniatursized specimens was performed at 77 and 4 K for solution treated and sensitized JN1 austenitic stainless steel, a candidate cryogenic structural material. The area under the load-deflection curve up to the maximum applied load in SP test was defined as the SP enerpy, to characterize the resistance to fracture. Although solution treated material exhibited ductile fracture mode with high SP enerpy, embrittlement behavior due to sensitization at 650-800°for 1-5 h was shown clearlg by SP test with brittle intergranular fracture and decreased SP enerpy. Comparison of the results obtained by SP test with those by fracture toughness test showed the usefulness of SP test for evaluation of sensitization induced embrittlement at cryogenic temperature. The re-sults obtained in this study can be very usefol in predicting the degradation due to welding and other processing in cryogenic materials.
关键词:
small punch test
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null
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null
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许立萌
,
关凯书
机械工程材料
doi:10.11973/jxgccl201705017
对运行10 a的3Cr1Mo1/4V钢制加氢反应器内试块取样进行了脱脆热处理,与未热处理(脆化态)试样在不同温度下进行了小冲杆试验和夏比冲击试验,提出了以断裂能与最大载荷的比值(ESP/Fm)作为确定小冲杆试验韧脆转变温度的方法,得到韧脆转变温度及其增量,并与夏比冲击试验结果进行了对比.结果表明:小冲杆试验得到的ESP/Fm-温度曲线与夏比冲击试验得到的冲击功-温度曲线具有相同的变化趋势;与断裂能相比,ESP/Fm可以更好地表征材料的韧脆状态;以ESP/Fm稳定值的60%对应的温度作为韧脆转变温度,得到的韧脆转变温度增量与由夏比冲击试验得到的近似相等,小冲杆试验可以用来评价3Cr1Mo1/4V钢的回火脆性.
关键词:
小冲杆试验
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韧脆转变温度
,
回火脆化
