Microstructures and Mechanical Properties of HAZ of Weld Thermal Simulation for 10Ni8CrMoV Steel
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摘要: 采用焊接热模拟试验方法,模拟980 MPa级10Ni8CrMoV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。Abstract: Microstructures and mechanical properties of HAZ of 10Ni8CrMoV of 980 MPa high strength steel were studied. The different regions of HAZ were simulated by weld thermal simulation technique. Microstructure observation,phase analysis,and corresponding tensile and impact tests for different regions in HAZ were made. The results indicated that the yield strength and plasticity were significantly reduced in the coarse grain zone; impact toughness of different regions in HAZ had no obvious change with the changing of the heat inputs; critical zone of HAZ had the worst impact toughness and was the weakest part of the HAZ; the main reason for higher impact toughness of coarse grain zone was that more austenite films was continuously distributed in this area.
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Keywords:
- 980 MPa /
- weld thermal simulation /
- HAZ /
- austenite
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