Inconel 800合金波纹管开裂的原因

摘要

某石化公司的Inconel 800合金波纹管在临时停工后产生裂纹,通过化学成分分析、宏观和微观形貌观察、扫描电镜及能谱分析、透射电镜观察等方法对裂纹产生的原因进行了分析.结果表明:由于波纹管在使用过程中发生敏化现象,且停工期间处于连多硫酸介质中,从而发生了晶间腐蚀,所产生的微裂纹为裂纹源;在应力作用下,微裂纹扩展并导致应力腐蚀裂纹的形成.%The cracks were found on the Inconel 800 alloy bellows in a petrochemical company after temporary stoppage.The cracking reason was analyzed by chemical composition analysis,macroscopic and microscopic morphology observation,scanning electron microscopy and energy spectrum analysis,transmission electron microscope analysis.The results show that the sensitization of bellows occurred during application and were in the polythionic acid environment during the stoppage time which resulted in the intergranular corrosion.The microcracks produced by intergranular corrosion were the source of cracks and eventually the microcracks extended and resulted in the formation of stress corrosion cracks under the action of stress.