REN Yanming, LIU Fuguang, LI Taijiang, et al. Microstructure and mechanical properties of dissimilar welded joints of 20Cr13 martensitic steel for low pressure steam turbine blade without PWHT[J]. Thermal power generation, 2014, 43(5): 75-78.
REN Yanming, LIU Fuguang, LI Taijiang, et al. Microstructure and mechanical properties of dissimilar welded joints of 20Cr13 martensitic steel for low pressure steam turbine blade without PWHT[J]. Thermal power generation, 2014, 43(5): 75-78.DOI:
汽轮机低压叶片用20Cr13马氏体钢异种钢接头的组织性能分析
摘要
对Ni基焊材的20Cr13马氏体耐热钢焊态异种钢接头的组织与力学性能进行了试验研究
分析了此类焊接接头的薄弱部位
提出了工艺改进措施。试验结果表明
焊态异种钢接头的抗拉强度可以达到母材的90%以上
热影响区粗晶区是此类接头的薄弱部位;采用多层多道的小规范焊接工艺并补加焊接回火焊道
可以使20Cr13钢热影响区粗晶区的性能得到改善。
Abstract
Experimental study on microstructure and mechanical properties of dissimilar steel welded joints of 20Cr13martensitic heat-resistant steel for steam turbine blade without PWHT were conducted.Moreover
the weak parts of these kinds of joints were analyzed and process improvement measures were proposed.The results show that
the tensile strength of 20Cr13steel welded joints using Ni base filler metal without PWHT can reach over 90% of parent metal's and coarse grain HAZ are weak zone of the welded joints.Multi-pass welding process of low welding heat input and temper bead should be used with the purpose of coarse grain regions' brittlement reduction.