高强度厚钢板止裂韧性K_(ca)与常规力学性能的相关性分析

Relationship Analysis of Crack Arrest Toughness K_(ca) and Conventional Mechanical Properties

统计分析了28组采用TMCP工艺制造的高强度厚钢板-10℃止裂韧性K_(ca)与屈服强度R_(P0.2)、抗拉强度R_m、-40℃冲击功KV_2、-20℃和-40℃动态撕裂能DTE、零塑性转变温度T_(NDT)的相关性规律,结果表明,-10℃止裂韧性K_(ca)与心部抗拉强度R_m和侧面零塑性转变温度T_(NDT)的相关度较高,随着心部抗拉强度R_m的增高和侧面零塑性转变温度T_(NDT)的降低,-10℃止裂韧性K_(ca)增大;在此基础上建立了-10℃止裂韧性K_(ca)与心部抗拉强度R_m、侧面零塑性转变温度T_(NDT)和板厚t的相关性方程K_(ca)=13.358·R_m-90.530·T_(NDT)-7.324·t^(1.5)或K_(ca)=13.427·R_m-74.845·T_(NDT)-0.635·t^2。

Relation between crack arrest toughness Kcaat-10℃and yield strength RP0.2,tensile strength Rm,impact toughness KV2at-40℃,dynamic tearing energy DTE at-20℃and-40℃and side-section TNDT was analyzed by 28 troops of test data of high strength heavy plates.Results indicate that crack arrest toughness Kca at-10℃is highly correlative with Rm at center section and side-section TNDT.Kca at-10℃increases with the increasing of Rmat center section and the decreasing of side-section TNDT.The relationship formula of Rmat center section,side-section TNDT,plate thickness t and Kcaat-10℃is proposed based on the above results：Kca=13.358·Rm-90.530·TNDT-7.324·t1.5or Kca=13.427·Rm-74.845·TNDT-0.635·t^2.