金属热处理
金屬熱處理
금속열처리
HEAT TREATMENT OF METALS
2015年
4期
77-80,81
,共5页
亚共析合金钢%大截面%亚温淬火%低温冲击性能
亞共析閤金鋼%大截麵%亞溫淬火%低溫遲擊性能
아공석합금강%대절면%아온쉬화%저온충격성능
hypoeutectoid alloy steel%large section%subcritical quenching%low-temperature impact property
对自主研发的LS8铸钢大截面试样采用完全淬火+高温回火( QT)、亚温淬火+高温回火( LT)和完全淬火+亚温淬火+高温回火(QLT)3种不同工艺进行热处理，分析了热处理工艺对大截面试样组织和力学性能的影响。结果表明，经QLT工艺处理后大截面试样心部的低温冲击性能最好，满足API Spec 8C要求。显微组织观察及冲击断口形貌分析结果表明，低温冲击性能的提高与亚温淬火后组织中弥散分布的细小铁素体有关。
對自主研髮的LS8鑄鋼大截麵試樣採用完全淬火+高溫迴火( QT)、亞溫淬火+高溫迴火( LT)和完全淬火+亞溫淬火+高溫迴火(QLT)3種不同工藝進行熱處理，分析瞭熱處理工藝對大截麵試樣組織和力學性能的影響。結果錶明，經QLT工藝處理後大截麵試樣心部的低溫遲擊性能最好，滿足API Spec 8C要求。顯微組織觀察及遲擊斷口形貌分析結果錶明，低溫遲擊性能的提高與亞溫淬火後組織中瀰散分佈的細小鐵素體有關。
대자주연발적LS8주강대절면시양채용완전쉬화+고온회화( QT)、아온쉬화+고온회화( LT)화완전쉬화+아온쉬화+고온회화(QLT)3충불동공예진행열처리，분석료열처리공예대대절면시양조직화역학성능적영향。결과표명，경QLT공예처리후대절면시양심부적저온충격성능최호，만족API Spec 8C요구。현미조직관찰급충격단구형모분석결과표명，저온충격성능적제고여아온쉬화후조직중미산분포적세소철소체유관。
Large section LS8 cast steel was treated with three types of heat treatment processes,i. e. complete quenching + high-temperature tempering ( QT ) , subcritical quenching + high-temperature tempering ( LT ) and complete quenching + subcritical quenching + high-temperature tempering ( QLT) ,respectively. Effect of heat treatment process on microstructure and mechanical properties of the large section sample was analyzed. The results show that the low-temperature impact property at the core of the large section sample is the best when with QLT treatment, which can meet the requirements of API Spec 8C standard. The results of microstructure observation and fracture morphology analysis indicate that the improvment of low-temperature impact property is relevant to fine and dispersive ferrite in the microstructure by subcritical quenching.
