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本文对微合金非调质钢不同锻造条件下的断裂韧性进行了测试,通过金相组织,断口形貌及裂纹走向的观察与分析得出:影响这种钢断裂韧性的主要因素为铁素体百分含量、晶粒大小及分布形态,而且可以用铁素体平均自由程这一参数来反映铁素体对断裂韧性的影响。锻造温度升高,造成铁素体量下降,而且呈网状分布,对断裂韧性不利,在保证等轴状铁素体均匀分布基础上,细化晶粒使断裂韧性大大提高。
In this paper, the fracture toughness of microalloy non-quenched and tempered steel under different forging conditions was tested. The microstructure, fracture morphology and crack trend were observed and analyzed. The main factors affecting the fracture toughness of this kind of steel are ferrite Percentage content, grain size and distribution morphology, and the average free path of ferrite can be used to reflect the effect of ferrite on fracture toughness. Forging temperature increases, resulting in a decrease in ferrite, and was reticular distribution of detrimental to the fracture toughness, to ensure equal distribution of equiaxed ferrite based on the grain refinement to greatly improve the fracture toughness.