摘要
具有较高强度和良好韧性的SPV50Q钢常用于制造液化石油气(liquefiedpetroleumgas,LPG)球罐,球罐通过焊接制造后一般不经过焊后热处理,因此在焊接接头处将有焊接残余应力存在。服役经历和现场检测表明,较高H2S浓度和焊接残余应力将会导致材料产生环境失效如氢鼓泡(hydrogenblistering,HB)或氢致开裂(hydrogen-inducedcracking,HIC)、硫化物应力腐蚀开裂(sulfidestresscorrosioncracking,SSCC)以及应力诱导氢致开裂(stress-orientedhydrogeninducedcracking,SOHIC)。文中通过1×10-6s-1的慢应变速率拉伸试验,对手工电弧焊焊接的SPV50Q焊接接头在不同浓度H2S水溶液中的开裂敏感性以及开裂特征进行研究。试验结果表明,SSCC和HIC发生在靠近焊接接头热影响区的母材上,不同温度下的焊后热处理将降低材料的应力腐蚀开裂敏感性,实施正确焊后热处理可提高SPV50Q焊接接头抵抗SSCC或HIC能力,而不降低钢的力学性能尤其是韧性。
SPV50Q steel of high strength and good ductility is often employed in construction of liquefied petroleum gas （LPG） spherical tanks. In general post weld heat treatment is not performed after welding of the steel and residual stress will be retained in the weldment. Service experiences and inspections indicate that higher H2 S concentration and welding residual stress may result in the environmental failure, such as hydrogen blistering （HB）or hydrogen-induced cracking （HIC）, sulfide stress corrosion cracking （SSCC） and stress-oriented hydrogen induced cracking （SOHIC）. The cracking susceptibility of SPV50Q steel weldment by manual electric arc weld- ing has been investigated in various solutions with different concentrations of H2S. The results of slow strain rate testing, performed at a strain rate of 1 × 10^-6s^-1 , reveal the presence of SSCC and HIC in the zone of HAZ adjacent to weldment. The effects of temperature of post weld heat treatment on cracking are discussed. The appropriate post weld heat treatment （PWHT） procedure could enhance the resistance of SPV50Q weldment against SSCC or HIC and does not decrease the mechanical properties of SPV50Q weldment, in particular material ductihty.
出处
《机械强度》
EI
CAS
CSCD
北大核心
2007年第1期97-102,共6页
Journal of Mechanical Strength
基金
南京工业大学博士创新基金资助(BSCX200512)
关键词
高强钢
硫化物应力腐蚀开裂
氢致开裂
H2S浓度
慢应变速率试验
焊后热处理
High strength steel
Sulfide stress corrosion cracking （SSCC）
Hydrogen-induced cracking （HIC）
H2S concentration
Slow strain rate testing （SSRT）
Post weld heat treatment
