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采用焊接热模拟试验方法,模拟980 MPa级10Ni8Cr Mo V高强钢焊接接头热影响区的不同区域,通过对不同线能量条件下不同区域的拉伸、冲击试验及各个区域的组织分析,研究了该钢模拟热影响区的组织和性能。结果表明,该钢模拟热影响区粗晶区强度、塑性较基体显著降低;各区域低温冲击韧性随线能量的增大变化不明显,临界区韧性最低、为焊接接头的薄弱区域,粗晶区存在较多连续分布的奥氏体薄膜,是粗晶区低温冲击韧性较高的主要原因。
The welding heat simulation test was used to simulate different regions of the HAZ of 980 MPa grade 10Ni8Cr Mo V high strength steel welded joints. The tensile and impact tests of different regions under different line energy conditions and the tissue analysis of each region were conducted to study Steel simulates the organization and properties of the heat affected zone. The results show that the strength and ductility of the coarse-grained zone in the simulated heat-affected zone of the steel is significantly lower than that of the matrix. The low-temperature impact toughness of each zone does not change obviously with the increase of the line energy and the toughness of the critical zone is the lowest, which is the weak zone of the welded joint. There are more continuous distribution of austenite films, coarse grain is the main reason for high impact toughness at low temperature.