采用斜Y型坡口焊接裂纹试验方法研究再热温度对国产T23钢再热裂纹敏感性的影响，探讨国产T23钢再热裂纹形成机理。结果表明，国产T23钢有再热裂纹倾向，再热裂纹敏感温度区间为550~690℃，在620℃时再热裂纹敏感性最大，再热760℃则无再热裂纹产生。分析认为，晶界的弱化和晶内的强化是T23钢再热裂纹形成的内因，外因则是高拘束导致的焊接残余应力。
The effect of reheat temperature on the domestic T23 steel’s reheat cracking susceptibility was studied by the Y-slit type cracking test,and the reheat cracking formation mechanism of T23 steel was discussed. The results show that the domestic T23 steel has reheat cracking susceptibility when the reheat temperature ranges from 550 ℃ to 690 ℃. The reheat cracking susceptibility reaches the highest at 620 ℃,while there is no generated cracks when the reheat temperature is 760 ℃. It is believed that the grain boundary weakening and intragranular strengthening are the internal reasons for the formation of T23 steel’s reheat cracking. The external reason is welding residual stress caused by the high restraint.
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