不锈钢冷堆工艺对SA-508Gr.3 Cl.1钢裂纹敏感性的影响分析

不锈钢冷堆工艺对SA-508Gr.3 Cl.1钢裂纹敏感性的影响分析 Analysis of the influence of stainless steel cladding without preheating on the crack sensitivity of SA-508Gr.3 Cl.1 张亚斌 ZHANG Yabin 1 first-author 罗英 LUO Ying 1 杨敏 YANG Min 1 王小彬 WANG Xiaobin 1 李玉光 LI Yuguang 1 陈海波 CHEN Haibo 1 杨志海 YANG Zhihai 1 中国核动力研究设计院核反应堆系统设计技术重点实验室 中国核动力研究设计院核反应堆系统设计技术重点实验室 Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China 为了分析不锈钢冷堆工艺对母材裂纹敏感性的影响,采用实际产品堆焊参数进行了堆焊试验,结合裂纹产生机理,分析了合金化学成分及热处理工艺对低合金钢裂纹敏感性的影响。研究表明,SA-508Gr.3 Cl.1钢在SA-508Gr.2 Cl.1钢的基础上,减少了硬化元素含量,严格控制氢含量,降低了再热裂纹和氢致裂纹的敏感性;堆焊前对母材进行预热,堆焊后进行后热处理或消除应力热处理,进一步抑制了母材氢致裂纹的产生。在不预热的情况下进行耐蚀层的堆焊,对低合金钢母材及热影响区的热影响较小。通过磁粉及液体渗透检验,过渡层与母材的交界处及熔合线下3 mm的范围内无显微裂纹等缺陷,不会增加低合金钢母材及热影响区层下裂纹的风险,减少了堆焊层在高温的停留时间,降低了产生硬脆相的可能,使堆焊层质量更加可靠。 To analysis the influence of cladding without preheating on the crack sensitivity of base metal,the alloy content and heat treatment is investigated by cladding test with parameters for actual product,combined with the mechanism of crack occurrence. Research indicates that compared with SA-508Gr.2 Cl.1,content of harden element is reduced and hydrogen is strictly controlled for SA-508Gr.3 Cl.1,which reduces the sensitivity of SA-508Gr.3 Cl.1 to re-heating crack and hydrogen induced crack. Transition cladding of SA-508Gr.3 Cl.1 with preheating and post-heating or stress relieving heat treatment reduces the sensitivity of hydrogen induced crack again. Corrosion-resistant lay of cladding without preheat has little influence on the heat affected zone and base metal. The result of liquid penetrant test and magnetic test indicates that no micro crack exists at the interface of base metal and cladding as well as 3 mm under cladding. The research above concludes that corrosion-resistant cladding without preheating will not increase the risk of under-clad crack of low alloy steel base metal and heat affected zone,reduce the high temperature time for cladding and reduce the probability of hardening phase,which in all make the quality of cladding more reliable. 不锈钢 冷堆工艺 裂纹敏感性 层下裂纹 反应堆压力容器 stainless steel cladding without preheating crack sensitivity sublayer crack reactor pressure vessel（RPV） TL351.6;TG455 2022-03-08 6 50