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用金相、电子探针、膨胀分析等对12AlMoV钢焊接接头第一类碳迁移过程进行了研究.结果证明,发生这类碳迁移是由于在碳快速扩散的温度范围,熔合线一侧较早地析出先共析铁素体,使熔合线两侧存在显著的碳活度差所产生.从而验证了作者等提出的焊接接头碳迁移的活度原理. 对这类接头,晶体结构的不同所引起碳活度系数的差别,较之合金成分的不同引起的差别为大.前者是发生第一类碳迁移的主要的热力学条件.从动力学方面考虑,碳迁移进行的程度,与一定温度下的保持时间有关. 为减弱和抑制12AlMoV钢焊接接头碳迁移,并提出了合金化和焊接工艺措施.
The first type of carbon migration process of 12AlMoV steel welded joint was studied by means of metallography, electron probe and expansion analysis.The results show that this type of carbon migration occurs due to the rapid diffusion of carbon in the temperature range, Proeutectoid ferrite is precipitated so that there is a significant difference in carbon activity between the two sides of the weld line, thus verifying the activity principle of the carbon bond migration proposed by the author etc. For such joints, different crystal structures The difference between the carbon activity coefficients caused by the different composition of the alloy is large.The former is the main thermodynamic conditions for the first type of carbon migration.From the kinetic aspect, the degree of carbon migration, with a certain temperature Of holding time.In order to weaken and restrain the carbon migration of 12AlMoV steel welded joints, alloying and welding process measures were proposed.