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本文在国内首次应用变形速率连续可变式结晶裂纹试验方法(Continuously Variable Deforma-tion Rate Cracking Test简称V.D.R试验方法),研究了低合金高强度钢埋弧焊时,合金元素对焊缝金属结晶裂纹敏感性的影响。针对日本WEL—TEN60～80钢含多种合金元素的特点。研究了Mn、SiCr、Mo、V、Ti、Ni、Nb、Cu、B等元素对裂纹的影响,并得到了结论。结果表明:Mn、Cr、V、Ti在一定范围内是降低结晶裂纹敏感性的元素,而Ni、Si、B、Nb是增大结晶裂纹敏感性的元素。Mo、Cu、虽也有增加结晶裂纹敏感性,但影响较小。试验结果还表明了V.D.R试验和横向可变拘束试验结果的一致性。 本试验成果为研制Wel—Ten60—80新钢种焊接材料和可焊性试验提供了理论依据。
In this paper, for the first time in China, the VDR method is applied to investigate the effect of alloying elements on the microstructure and mechanical properties of the weld metal during the submerged arc welding of low alloy and high strength steel. The impact of sensitivity. For Japan WEL-TEN60 ~ 80 steel with a variety of alloying elements. The effects of Mn, SiCr, Mo, V, Ti, Ni, Nb, Cu, B and other elements on the crack were studied and the conclusions were drawn. The results show that Mn, Cr, V and Ti are the elements that reduce the sensitivity of crystal cracks in a certain range, while Ni, Si, B and Nb are the elements that increase the sensitivity of crystal cracks. Mo, Cu, although also increase the sensitivity of crystal cracking, but less affected. The test results also show the consistency of the results of the V.D.R test and the laterally variable restraint test. The results provide a theoretical basis for the development of Wel-Ten60-80 new type of welding materials and weldability test.