压力容器
壓力容器
압력용기
2014年
2期
1-8
,共8页
杨景标%陈学东%范志超%艾志斌%郑炯
楊景標%陳學東%範誌超%艾誌斌%鄭炯
양경표%진학동%범지초%애지빈%정형
过火%损伤%硬度%金相组织%临界值范围
過火%損傷%硬度%金相組織%臨界值範圍
과화%손상%경도%금상조직%림계치범위
fire exposure%damage%hardness%metallographic structures%critical range
对危化品大型储罐典型用钢07 MnNiMoDR进行不同热暴露温度、保温时间和冷却速率的热处理来模拟火灾发生时的受火过程，对经历不同热处理工艺后的硬度和金相组织进行了测定和检验。结果表明，07 MnNiMoDR钢受火后其硬度和金相组织急剧变化的温度临界值范围为650～750℃，650℃以下时硬度值范围为190～220 HV10且保温时间对硬度和金相的影响不明显；在相同的温度和保温时间下，水冷时的硬度总高于空冷时的硬度；显微组织为硬度的变化规律提供了依据。当保温时间为2～12 h和热暴露温度高于温度临界值时，空冷时硬度随温度升高而不断下降，750和850℃时最大的硬度相对百分数分别降低了10％和25％；水冷时硬度随温度先下降后升高，750℃时硬度达到最小值，此时最大的硬度相对百分数下降了5％，当温度达到850℃时最大的硬度相对百分数增加了30％。
對危化品大型儲罐典型用鋼07 MnNiMoDR進行不同熱暴露溫度、保溫時間和冷卻速率的熱處理來模擬火災髮生時的受火過程，對經歷不同熱處理工藝後的硬度和金相組織進行瞭測定和檢驗。結果錶明，07 MnNiMoDR鋼受火後其硬度和金相組織急劇變化的溫度臨界值範圍為650～750℃，650℃以下時硬度值範圍為190～220 HV10且保溫時間對硬度和金相的影響不明顯；在相同的溫度和保溫時間下，水冷時的硬度總高于空冷時的硬度；顯微組織為硬度的變化規律提供瞭依據。噹保溫時間為2～12 h和熱暴露溫度高于溫度臨界值時，空冷時硬度隨溫度升高而不斷下降，750和850℃時最大的硬度相對百分數分彆降低瞭10％和25％；水冷時硬度隨溫度先下降後升高，750℃時硬度達到最小值，此時最大的硬度相對百分數下降瞭5％，噹溫度達到850℃時最大的硬度相對百分數增加瞭30％。
대위화품대형저관전형용강07 MnNiMoDR진행불동열폭로온도、보온시간화냉각속솔적열처리래모의화재발생시적수화과정，대경력불동열처리공예후적경도화금상조직진행료측정화검험。결과표명，07 MnNiMoDR강수화후기경도화금상조직급극변화적온도림계치범위위650～750℃，650℃이하시경도치범위위190～220 HV10차보온시간대경도화금상적영향불명현；재상동적온도화보온시간하，수랭시적경도총고우공랭시적경도；현미조직위경도적변화규률제공료의거。당보온시간위2～12 h화열폭로온도고우온도림계치시，공랭시경도수온도승고이불단하강，750화850℃시최대적경도상대백분수분별강저료10％화25％；수랭시경도수온도선하강후승고，750℃시경도체도최소치，차시최대적경도상대백분수하강료5％，당온도체도850℃시최대적경도상대백분수증가료30％。
Heat treatment with different temperature ,holding time and cooling rate was conducted for typical steel 07MnNiMoDR used in hazardous chemicals storage tanks to simulate the fire process .Hardness and metallographic structures of 07MnNiMoDR after different heat treatment processes were tested and inspec -ted.The results show that , critical temperature range for the hardness and metallographic structures of 07MnNiMoDR steel to change rapidly after fire is 650~750 ℃,the hardness range is 190~220 HV10 and the effect of holding time on hardness and metallographic structures is not obvious when the temperature is lower than 650 ℃.The hardness under water cooling is always higher than that under air cooling at the same temperature and holding time .Metallographic structures provide evidences for the hardness change law.When the temperature is higher than the critical value and at the holding time of 2~12 h,the hard-ness decreases with temperature under air cooling conditions , and the maximum relative hardness is re-spectively reduced by 10%and 25%at 750 ℃and 850 ℃;under water cooling conditions ,hardness de-creases at first and then increases with temperature ,and it reaches the lowest value when the temperature is 750 ℃where the maximum relative hardness is reduced by 5%,however the maximum relative hard-ness is increased by 30%when the temperature reaches 850 ℃.
