化学处理的高强度钢氢损伤及缺口强度研究

Study on Hydrogen Damage and Notch Strength of High Strength Steel by Chemical Treatment

采用缺口试样慢拉伸试验研究了高强度钢在镀铬和电解酸洗后的断裂行为及其吸氢、放氢规律。结果表明,高强度结构钢经电解酸洗和镀铬后都有显著渗氢,且镀铬后的渗氢量高于电解酸洗;镀铬渗入的氢经180℃去氢处理后仍有1.5～3.0ml/100g的残存量,残存氢的多少与钢种和组织状态有关,高锰钢、硅锰钢和铬锰钢的存氢量高于铬镍钢;电解酸洗或镀铬渗入的氢与残余应力相作用,导致材料产生氢损伤及钢的缺口强度大幅降低。

The fracture behavior and hydrogen absorption and desorption of high strength steel after chromium electroplating and electrolytic pickling were researched by slow tensile test method of notch specimens. The test results show that high strength steels after chromium electroplating and electrolytic pickling have significant hydrogenation. The hydrogenation amount after chromium electroplating is significantly higher than that of electrolytic pickling.The hydrogenation amount of chromium electroplating by hydrogen desorption treatment at 180℃ is 1.5-3.0 ml/100 g residues. The residual hydrogenation amount is related with type and microstmcture of steel. The hydrogenation amount of high manganese steel, manganese steel and chromium manganese steel is higher than that of the nickel chromium steel. The interaction of hydrogen absorption of electrolytic pickling and chromium electroplating and residual stress can cause the hydrogen damage of the material. The notch strength of the material greatly reduces.