用Gleeble-3800热模拟试验机模拟了09MnNiDR低温压力容器钢焊接临界粗晶区(intercritically reheated coarse-grained heat-affected zone),并对其进行了焊后热处理(post-welding heat treatment)工艺研究.采用力学性能检测及结构表征方法研究了热处理前后焊接临界粗晶区的力学性能及影响机制.试验分析表明,尺寸较大的M-A岛(martensite-austenite island)是材料受力时裂纹的启裂源,是引起试验钢焊接临界粗晶区冲击韧性较差的主要原因.经过焊后热处理,临界粗晶区的冲击韧性明显改善,并且热处理温度工艺窗口(560～640℃)较宽.热处理后M-A岛的分解、碳化物的球化及大角度晶界对裂纹扩展的阻碍作用是韧性提高的主要原因.
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