10CrNi3MoV钢焊接热影响区组织和晶粒度研究

The study of microstructure and grain size of weld HAZ in 10CrNi3MoV steel

采用焊接热模拟技术研究了590MPa级船用高强度结构钢焊接热影响区组织和晶粒度的变化规律.研究结果表明:10CrNi3MoV钢热影响区粗晶区(CGHAZ)经峰值温度在临界相变点Ac1'和Ac3'温度范围二次热循环后,具有粗大组织或粗大晶粒遗传现象.焊接线能量(t8/5时间)对粗大晶粒遗传没有影响,但对粗大组织遗传具有显著影响.当t8/5较小时,能够产生粗大组织遗传.当t8/5较大时,仅仅产生粗大晶粒遗传.并且,随着t8/5值增加,产生粗大组织遗传的温度区间减小.

The study on the HAZ's microstructure and grain size of 590MPa high strength ship-structure steel on a welding simulator indicated that after second thermal cycle with peak temperature between critical temperature Ac1' and Ac3', CGHAZ 10CrNi3MoV steel has the inheritance of coarse grain and coarse microstructure. Welding energy input (determined by t8/5time) has an effect on the inheritance of coarse microstructure, but no influence on the inheritance of coarse grain. whife for a shorter t8/5, there is an inheritance of coarse microstructure and grains; for a longer t8/5,there is only the inheritance of coarse grains. As t8/5 increasing, the scope of temperatures causing cocrse structure diminishes.