喷丸覆盖率对800合金传热管残余应力和抗应力腐蚀开裂性能的影响

Effects of different cover rate of shop peening on residual stress and stress corrosion cracking of 800 alloy tube

采用自主设计的喷丸机对核电蒸汽发生器用800合金传热管进行了外表面喷丸处理.研究了不同喷丸覆盖率对核电蒸汽发生器用800合金传热管的表面形貌、残余应力及其在10%Na OH溶液高温高压环境下的抗应力腐蚀开裂(stress corrosion cracking,SCC)性能的影响.结果表明,喷丸处理能显著改变800合金传热管的表面形貌和应力状态,且随着喷丸覆盖率的增大,800合金传热管中的残余应力减少,抗应力腐蚀性能显著改善.

Shot peening is conducted on the outside surface of an 800 alloy heat-exchanging tube in a nuclear steam generator using a shot-peening machine. The effects on the 800 alloy tube surface micrograph, residual stress and stress corrosion cracking （SCC） in the 10%NaOH solution at high temperature and high pressure have been studied. The result shows that the shot peening can change the surface micrograph and residual stress of the 800 alloy tube. As the cover rate of shot peening is creases, the residual stress of the 800 alloy tube gradually decreases, and SCC resistance is significantly improved.