论文部分内容阅读
使用Gleeble-3800热模拟试验机研究了在800-500℃冷却时间(t8/5)对TMCP890钢焊接热影响区(HAZ)粗晶区组织转变规律和性能的影响,结果表明:冷却时间t8/5为6-20 s时粗晶区组织为板条马氏体,硬度值为334-328HV10;t8/5为20-60 s时粗晶区组织为板条马氏体+板条贝氏体,硬度值为328-305 HV10,Bs点在490-510℃;t8/5为150-2000 s时粗晶区组织为板条贝氏体+粒状贝氏体,Bs点在530-570℃,硬度值保持在270 HV10。稻垣道夫经验公式适用于TMCP890钢实际焊接过程中t8/5的计算,热输入E在10-20 k J/cm、T0在50-150℃变化时粗晶区的硬度值为318-335HV10,硬度值的波动幅度较小,性能稳定。
The effect of cooling time (t8 / 5) on the microstructure transformation and properties of HAZ in TMCP890 steel was investigated by using Gleeble-3800 thermal simulation machine. The results show that the cooling time t8 / 5 is 6-20 s, the coarse-grained zone is lath martensite with a hardness of 334-328 HV10; in the case of t8 / 5 of 20-60 s, the coarse-grained zone is lath martensite + lath bainite , The hardness value is 328-305 HV10, the Bs point is 490-510 ℃; when the t8 / 5 is 150-2000 s, the coarse grain structure is lath bainite + granular bainite, the Bs point is 530-570 ° C., The hardness value is maintained at 270 HV10. The empirical formula of Inagaki is suitable for the calculation of t8 / 5 in the actual welding process of TMCP890 steel. The hardness value of the coarse grain zone is 318-335HV10 when the thermal input E is 10-20 kJ / cm and T0 changes from 50 to 150 ℃. The hardness Value fluctuations smaller, stable performance.