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温度对SA508-Ⅲ钢焊缝金属断裂韧度的影响
李相清, 丁振宇, 包士毅, 高增梁
浙江工业大学 过程装备及其再制造教育部工程研究中心, 杭州 310014
摘要:
为了获得温度对SA508-Ⅲ钢焊缝金属断裂韧度的影响,采用本构曲线法(CCM,constitutive curve method)、ASTM和ISO标准对焊缝金属在典型温度下的试验数据进行了处理.结果表明,采用CCM获得的断裂韧度随温度的升高而降低.当温度从20℃升高到100℃,从100℃升至320℃时,断裂韧度分别降低了11.1%和5.4%.采用扫描电镜观测试样断口形貌发现SA508-Ⅲ钢焊缝金属在典型温度下均呈韧性断裂,当温度达到100和320℃时,韧窝变浅变小,因此韧性出现了一定的下降.研究还发现,采用CCM获得20和100℃时的断裂韧度与ASTM一致;获得320℃时的断裂韧度介于ASTM和ISO之间.
关键词:  钝化线方程  SA508-Ⅲ钢  焊接接头  断裂韧度
DOI:10.12073/j.hjxb.2019400179
分类号:TG404
基金项目:“十三五”国家重点研发计划项目(2016YFC0801902);国家自然科学基金资助项目(51705457)
Effect of temperature on fracture toughness of SA508-Ⅲ weld metal
LI Xiangqing, DING Zhenyu, BAO Shiyi, GAO Zengliang
Engineering Research Center of Process Equipment and Remanufacturing, Zhejiang University of Technology, Hangzhou 310014, China
Abstract:
In order to obtain the effect of temperature on fracture toughness of the SA508-Ⅲ weld metal, the constitutive curve method (CCM), ASTM and ISO standard were applied to determine the fracture toughness of weld metal in typical temperature points. The fracture toughness value obtained from CCM showed a reduction trend with the increase of temperature. When the temperature increased from 20℃ to 100℃ and from 100℃ to 320℃, the fracture toughness value were reduced to 11.1% and 5.4%, respectively. SEM fracture photographs of Compact Tension specimens revealed that the tested SA508-Ⅲ weld metal presented ductile fracture at test temperature points. However, when the temperature reached 100℃ to 320℃, dimples became shallow and small, which led to the decrease of fracture toughness. Moreover, this study also found that the fracture toughness obtained from CCM was the same as that of ASTM standard at 20℃ and 100℃, and intermediate between that of ASTM and ISO at 320℃.
Key words:  blunting line equation  SA508-Ⅲ steel  welded joint  fracture toughness