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本文对拘束条件下的奥氏体与非奥氏体钢焊接接头熔合区氢浓度进行了测定。并建立变应变接头模型,对异种钢接头氢分布进行了有限元计算。结果表明:在熔合区,焊后氢浓度逐渐增加,当t=6000秒时出现极大值。最大氢浓度大小依次为:1Cr13熔合区,16Mn熔合区,1Crl8Ni9Ti熔合区。此结果与裂纹试验结果相吻合。这对防止电站设备中大量异种钢焊件的氢裂事故具有指导作用,而且为进一步研究焊接接头局部氢浓度与氢脆的关系、建立新的氢裂判据奠定了基础。
In this paper, hydrogen concentration in weld zone of austenitic and non-austenitic steel under restraint condition was measured. The strain model of the strain joint was established and the hydrogen distribution of the dissimilar steel joint was calculated by finite element method. The results show that in the fusion zone, the hydrogen concentration gradually increases after welding, and the maximum appears at t = 6000 seconds. The maximum hydrogen concentration followed by: 1Cr13 fusion zone, 16Mn fusion zone, 1Crl8Ni9Ti fusion zone. This result is consistent with the crack test results. This has a guiding role in preventing hydrogen cracking of a large number of dissimilar steel welding parts in power plant equipment, and lays a foundation for further research on the relationship between the local hydrogen concentration and hydrogen embrittlement in welded joints and establishing a new criterion for hydrogen cracking.