短时超温对超高压聚乙烯反应器材料组织影响
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摘要
对已使用的超高压聚乙烯管式反应器的材料30CrNiMo8低合金钢进行不同温度和时间的短时超温实验,在此基础上对其进行金相组织检验,扫描电镜观察和硬度测试,研究短时超温对超高压管式反应器材料微观组织和硬度的影响。结果表明:30CrNiMo8钢在短时超温中组织明显异常,晶粒长大并且碳化物增多;随着超温温度的增加,室温硬度在一定范围内逐渐减小,但当达到相变温度,硬度陡然增大;随着超温时间的增加,组织的晶粒增大,而材料的硬度反而减小。
Short-time overheating experiment of different temperature and time for the material 30 CrNiMo8 steel used in the service of the ultra-high pressure LDPE reactor was conducted. Through a serious of test of metallographic examination,SEM observation and hardness test on steel,the ultra-high pressure LDPE reactor material microstructure and hardness of reactor caused by overheating was investigated. Test results show that there is an obvious change of microstructure for 30 CrNiMo8 steel,whose grain grows and carbide growth during the overheating process. With the increase of supertemperature,the hardness at room temperature decreases gradually within limits,but when it reaches the phase-change temperature,the hardness increases sharply.With the increase of overheating time,the grain size of the microstructure is increased,but the hardness of the material is decreased.
Short-time overheating experiment of different temperature and time for the material 30 CrNiMo8 steel used in the service of the ultra-high pressure LDPE reactor was conducted. Through a serious of test of metallographic examination,SEM observation and hardness test on steel,the ultra-high pressure LDPE reactor material microstructure and hardness of reactor caused by overheating was investigated. Test results show that there is an obvious change of microstructure for 30 CrNiMo8 steel,whose grain grows and carbide growth during the overheating process. With the increase of supertemperature,the hardness at room temperature decreases gradually within limits,but when it reaches the phase-change temperature,the hardness increases sharply.With the increase of overheating time,the grain size of the microstructure is increased,but the hardness of the material is decreased.
引文
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[2]尚鸿昊,王凯.管式法工艺LDPE装置分解反应对超高压管道系统的影响及处理措施[J].中国科技纵横,2014(16):64-65.
[3]崔月涛,陈进,王印培,等.短时超温对加氢反应器材料损伤的试验研究[J].压力容器,2005(12):4-7.
[4]史志刚,马红,崔雄华,等.T23和T91高温过热器短时超温爆管的组织性能分析[J].热力发电,2014,43(9):130-132.
[5]童锦艳,冯微,付超,等.GH4033合金短时超温后的显微组织损伤及力学性能[J].金属学报,2015,51(10):1242-1252.
[6]田晓,肖国华,曹剑锋,等.短时超温对低温再热器材料组织和性能的影响[J].理化检验,2011,47(10):615-618.
[7]黄起中,祝宝东,孟静.LDPE管式反应器内超温分解原因分析及对策[J].合成树脂及塑料,2011,28(4):54.
[8]郑准备,张兵,王小迎,等.1100t/h锅炉再热器失效分析[J].热加工工艺,2004,25(6):53-54.
[9]陈涛,陈学东,刘春娇,等.离心铸造乙烯裂解炉管高温持久试验的金相组织影响[C].第八届全国压力容器学术会议论文集.北京:化学工业出版社,2013.
[10]张俊善.材料高温变形与断裂[M].北京:科学出版社,2007.
[11] SHIUE R K,CHEN C. Laser transformation hardening of tempered 4340 steel[J]. Metallurgical and Materials Transactions,1992,23(1):163-170.
[12]任涛林,王辉亭,文道维,等.晶界析出碳化物M23C6对护环用奥氏体不锈钢1Mn18Cr18N力学性能的影响[J].大电机技术,2014,44(3):44-49.