高强度厚钢板止裂韧性K_(ca)影响因素分析

统计分析了26组采用TMCP工艺制造的高强度厚钢板-10℃止裂韧性(K_(ca)~(-10℃))与碳当量(C_(eq))、晶粒度(GS_)、磷含量(w(P))和板厚(t)的相关性规律,结果表明,提高碳当量、增大晶粒度、降低杂质元素磷的含量、减小板厚均有利于止裂韧性的提高,在此基础上建立了止裂韧性与碳当量、晶粒度、磷含量和板厚的回归方程:K_(ca)~(-10℃)=23 443.45·C_(ep)+276.51·G_S-0.77·w(P)·t~3-2.75·t~(1.5)。

Factors Influencing Crack Arrest Toughness Kca of High Strength Thick Plate

Relations between crack arrest toughness Kca at-10 ℃ and carborn equivalent carbon equivalent,grain size Gs,phosphorus content w(P) and thickness t of high strength thick plate were analyzed by 26 groups of test data.Results indicate that Ceq,grain size,phosphorus content and crack arrest roughness Kca at-10 ℃ are correlative.Kca at-10 ℃ increases with the increasing of Ceq and grain size and the decreasing of phosphorus content and thickness.The regression equation of carborn equivalent Ceq,grain size Gs,phosphorus content w(P),thickness and Kca at-10 ℃ is proposed based on the results above:Kca-10℃ =23 443.45 · Cep +276.51 · Gs-0.77 · w(P) · t3-2.75 · t1.5.