共查询到18条相似文献,搜索用时 46 毫秒
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为保证压力容器焊接质量,必须正确选取焊材。选择焊材时除根据工艺方法及冶金特点,还应考虑母材厚度的影响,试验证明,16MnR钢埋弧焊时,不应选用H10MnSi/H431配合,而应选用H10Mn2/HJ431配合。 相似文献
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反应堆压力容器接管-安全端异种钢焊缝直射纵波超声检测方法 总被引:1,自引:0,他引:1
反应堆压力容器(RPV)接管-安全端对接接头属奥氏体-铁素体异种钢焊缝,因晶粒粗大的原因实施超声检测难度大。针对现有斜射纵波检测方法对面状缺陷检测能力不足的情况,结合焊缝具体结构特点提出了一种以安全端端面为探伤面的超声直射纵波检测方法。试验研究结果表明,该方法对垂直于焊缝表面的面状缺陷检测效果较好。该方法可与斜射纵波检测方法组合使用,在RPV制造阶段有推广应用价值。 相似文献
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The crystal structure evolution of the Cu-rich nano precipitates from bcc to 9R during thermal aging was studied in nuclear reactor pressure vessel (RPV) model steels. The specimens, contained higher copper and nickel contents than commercially available one, were heated at 890 ~C for 0.5 h and then water quenched followed by tempering at 0(50 ~C for I0 h and aging at 400 ~C for 1000 h. It was observed that bcc and 9R orthogonal structure, as well as 9R orthogonal and 9R monoclinic structure, coexist in a single Cu-rich nano precipitate. Further analyses pointed out that Cu-rich nano precipitates of bcc structure were not stable, it may preferentially transform to 9R orthogonal structure and then to 9R monoclinic structure. This results showed that the crystal structure evolution of the Cu-rich nano precipitates was complex. 相似文献
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中子辐照引起的核反应堆压力容器钢中磷的晶间偏析是导致核反应堆压力容器脆性断裂的主要因素之一.本文提出了预测核反应堆压力容器钢中杂质元素(主要是磷)晶间非平衡偏析的溶质拖拽模型,并且与速率理论模型进行了对比.该模型的预测结果与最近发表的压力容器钢(包括C—Mn和MnMoNi钢)的一些实验数据一致. 相似文献
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核反应堆压力容器主螺栓是连接核反应堆压力容器顶盖与筒体的紧固密封件。其质量过程控制主要包括:主螺栓无损检验、主螺栓机械加工、不完整螺纹修整,主螺栓清洁、包装。 相似文献