压力容器
壓力容器
압력용기
2014年
3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%热模拟%临界值%拉伸性能
過火%損傷%熱模擬%臨界值%拉伸性能
과화%손상%열모의%림계치%랍신성능
fire exposure%damage%thermal simulation%critical value%tensile properties
对07MnNiMoDR钢进行不同温度、保温时间和冷却速率的热处理来模拟材料的受火过程，对经历不同热处理后的材料进行了拉伸试验。结果表明，07 MnNiMoDR钢受火后其拉伸性能急剧变化的温度临界值为650℃；当温度高于650℃时，07 MnNiMoDR钢从有屈服变为无屈服现象；当温度低于临界值时，保温时间对拉伸性能影响不明显；在同一温度和保温时间下，水冷时的屈服强度和抗拉强度分别高于空冷时的强度；抗拉强度和硬度具有较好的线性关系。当温度高于临界值时，空冷下屈服强度和抗拉强度随温度升高而下降，850℃时屈服强度和抗拉强度分别下降到260 MPa和550 MPa；水冷下抗拉强度随温度升高而增大，850℃时增大到775 MPa，而屈服强度随温度先下降后增大，800℃时达到最小值390 MPa，随之增大到850℃时的550 MPa。
對07MnNiMoDR鋼進行不同溫度、保溫時間和冷卻速率的熱處理來模擬材料的受火過程，對經歷不同熱處理後的材料進行瞭拉伸試驗。結果錶明，07 MnNiMoDR鋼受火後其拉伸性能急劇變化的溫度臨界值為650℃；噹溫度高于650℃時，07 MnNiMoDR鋼從有屈服變為無屈服現象；噹溫度低于臨界值時，保溫時間對拉伸性能影響不明顯；在同一溫度和保溫時間下，水冷時的屈服彊度和抗拉彊度分彆高于空冷時的彊度；抗拉彊度和硬度具有較好的線性關繫。噹溫度高于臨界值時，空冷下屈服彊度和抗拉彊度隨溫度升高而下降，850℃時屈服彊度和抗拉彊度分彆下降到260 MPa和550 MPa；水冷下抗拉彊度隨溫度升高而增大，850℃時增大到775 MPa，而屈服彊度隨溫度先下降後增大，800℃時達到最小值390 MPa，隨之增大到850℃時的550 MPa。
대07MnNiMoDR강진행불동온도、보온시간화냉각속솔적열처리래모의재료적수화과정，대경력불동열처리후적재료진행료랍신시험。결과표명，07 MnNiMoDR강수화후기랍신성능급극변화적온도림계치위650℃；당온도고우650℃시，07 MnNiMoDR강종유굴복변위무굴복현상；당온도저우림계치시，보온시간대랍신성능영향불명현；재동일온도화보온시간하，수랭시적굴복강도화항랍강도분별고우공랭시적강도；항랍강도화경도구유교호적선성관계。당온도고우림계치시，공랭하굴복강도화항랍강도수온도승고이하강，850℃시굴복강도화항랍강도분별하강도260 MPa화550 MPa；수랭하항랍강도수온도승고이증대，850℃시증대도775 MPa，이굴복강도수온도선하강후증대，800℃시체도최소치390 MPa，수지증대도850℃시적550 MPa。
Heat treatment with different temperature , holding time and cooling rate was conducted for 07MnNiMoDR steel to simulate the fire exposure process .Tensile properties of 07MnNiMoDR after differ-ent heat treatment processes were tested .The results show that ,critical temperature for the tensile proper-ties to change rapidly after fire is 650 ℃below which the effect of holding time on the tensile properties is not obvious ,and the yielding phenomenon disappears when the temperature is higher than 650 ℃.At the same temperature and holding time ,the yield strength and tensile strength under water cooling are re-spectively higher than that under air cooling .A linear correlation is indicated by fitting the tensile strength and hardness .When the temperature is higher than the critical value ,the yield strength and the tensile strength decrease with temperature under air cooling ,and the two strength reach 260 MPa and 550 MPa respective-ly at 850 ℃.Under water cooling conditions ,the tensile strength increases with temperature ,and it rea-ches 775 MPa at 850 ℃;the yield strength reaches a minimum of 390 MPa at 800 ℃and then increases to 550 MPa at 850 ℃.
