在锅炉压力容的生产和检验中,常常遇到低合金铁素体钢的焊接结构,由于低合金铁素体钢焊缝显微组织的主要组份是各种形态的铁素体,而其焊缝的韧性很大程度上受其显微组织的影响,所以,焊接冷却过程相变所产生的铁素体形貌鉴别就显得尤为重要。但是,目前在国内外,有关低合金铁素体锕焊缝显微组织的分类、使用的术语及定量评 In the production and testing of boiler pressure capacity, the welding structure of low-alloy ferritic steel is often encountered. Since the main component of the microstructure of low-alloy ferritic steel weld microstructure is various forms of ferrite, The toughness of the weld is largely affected by its microstructure, so it is very important to identify the ferrite morphology caused by the phase transformation during the welding and cooling process. However, at present, both at home and abroad, the classification of the low alloy ferritic actinides weld microstructure, the use of terms and quantitative evaluation