奥氏体耐热钢HP40离心铸造辐射管的失效分析  

An Analysis on Failure of Centrifugal Casting Radiant Tubes of Austenite Heat Resistant Steel HP40

作　　者：张晓丽[1] 骆合力[2] 李尚平[2] 刘培英[1] 周铁涛[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083 [2]钢铁研究总院,北京100081

出　　处：《特殊钢》2008年第2期65-66,共2页Special Steel

摘　　要：HP40钢(%:0.35～0.45C、24～27Cr、34～37Ni、≤0.5Mo)辐射管在≤980℃服役2年9个月后开裂失效。分析结果表明,服役过程σ-相的析出导致材料脆化是辐射管开裂的主要原因,开裂区服役温度高于未开裂区,开裂区析出σ-相粗大、数量增多、塑韧性显著降低,致使该区开裂失效。The radiant tubes of HP40 steel （0. 35 ～0.45C, 24 ～27Cr, 34 ～37Ni, ≤0. 5Mo） cracked and failed after serveed for 2 years and nine months at ≤980℃. The analysis results showed that the σ phase precipitation which led to brittleness of materials was main cause for cracking of radiant tubes, the served temperature at cracking region was higher than that at non-cracking region, in cracking region the precipitated σ phase was coarse, the amount of σ phase increased, and the plasticity and toughness of this region obviously decreased led to cracking and failure.

关 键 词：HP40耐热钢 离心铸造辐射管 开裂失效σ-相 

分 类 号：TG249.4[金属学及工艺—铸造]