【摘要】：采用高功率激光對材料為304LN的AP1000核電站控制棒驅(qū)動(dòng)機(jī)構(gòu)(CRDM)Canopy焊縫模擬體進(jìn)行堆焊維修,焊絲采用鎳基Inconel 690合金,并研究堆焊工藝、堆焊層成形特點(diǎn)及顯微組織。結(jié)果表明:通過焊絲伸入熔池,以熔體熱傳導(dǎo)的方式進(jìn)行熔化,可以更好地保持熔池的穩(wěn)定性,并獲得表面成形優(yōu)異的焊道;焊道搭接率為42%時(shí),堆焊層非常平整,余高頂部和搭接部之間高度差僅在100~135μm之間;熔池邊界處未混合區(qū)鐵素體富集,與奧氏體的Inconel 690堆焊層形成晶格差異,會(huì)導(dǎo)致平直的Ⅱ-型邊界出現(xiàn);堆焊21道次才能對整個(gè)密封環(huán)進(jìn)行雙層覆蓋,兩道交替堆焊可保證密封環(huán)不出現(xiàn)下塌現(xiàn)象。
[Abstract]:The high power laser is used to maintain the (CRDM) Canopy weld analogue of the control rod driving mechanism of AP1000 nuclear power station (304LN). The wire is made of Ni-base Inconel 690 alloy, and the surfacing technology, forming characteristics and microstructure of the surfacing layer are studied. The results show that the stability of the weld pool can be better maintained and the excellent surface formed welding pass can be obtained by melting through the wire into the weld pool and melting by the way of melt heat conduction. When the lap ratio is 42, the surfacing layer is very smooth, and the height difference between the top of the remaining height and the lap part is only between 100 渭 m and 135 渭 m. The enrichment of ferrite in unmixed zone at the boundary of molten pool makes lattice difference with austenitic Inconel 690 surfacing layer, which leads to the appearance of straight 鈪，

本文編號：2414510