爆炸焊接对ITER级CuCrZr合金性能的影响

Effect of explosive welding on properties of ITER-grade CuCrZr alloy

为了研究爆炸焊接对ITER级CuCrZr合金性能的影响,针对爆炸焊接法制备的ITER屏蔽包层第一壁模块CuCrZr/316L(N)复合板,采用不同的固溶工艺进行处理。综合利用光学显微镜、场扫描电子显微镜和透射电镜,对整个工艺过程中CuCrZr合金的微观结构进行观察与分析,测试并评估了CuCrZr合金的硬度和拉伸性能。结合Gerold公式,计算了过时效状态下CuCrZr合金抗拉强度增量的范围。结果表明,固溶处理可以有效修复因爆炸荷载冲击造成的合金组织变形,经过固溶(980℃,30min)和热等静压(580℃,145 MPa,2h)处理后,结合界面CuCrZr一侧的硬度达到120HV,抗拉强度大于380MPa,显微组织呈现晶粒均匀细小等轴晶组织形态,平均晶粒尺寸直径为98μm,综合性能达到ITER标准。

To study the effect of explosive welding on the properties of ITER-grade CuCrZr alloy, the differ- ent solution annealing （SA） processes were used to make explosive welding CuCrZr/316L （N） panel for international thermonuclear experimental reactor （ITER） firstwall （FM） module. Optical microscopy （OM）, scanning electron microscopy （SEM） and transmission electron microscope （TEM） were utilized to analyze the microstructure of CuCrZr alloy through the whole process. Its hardness and tensile property were tested and evaluated. With reference to Gerold, the tensile strength increment scope of CuCrZr alloy was calculated at the over-aging state. According to the results, SA treatment can effectively repair the structure deformation of CuCrZr alloy caused by explosive blast. After SA （980 ℃, 30 rain） and hot iso- static pressing （HIP） （580 ℃, 145 MPa, 2 h） treatments, the CuCrZr side of joint will be finely undula- ted with the hardness of 120 HV and the tensile strength of 380 MPa.The CuCrZr alloy has isoaxial crystal structure in side, with fine and uniform crystalline grains whose average size is 98 μm, and meets the inter- national thermonuclear experimental reactor（ITER） standard in term of the overall performance indexes.