大厚度低温容器用途钢板热循环过程中组织演变规律及其对性能的影响  

The Microstructure Evolution Law of Heavy Steel Plate for Low Temperature Pressure Vessel in Thermal Cycle Process and Effects on Mechanical Properties

作　　者：谢章龙 滕赛楠 张丙军 刘朗 陈锋[2] Xie Zhanglong;Teng Sainan;Zhang Bingjun;Liu Lang;Chen Feng(Nanjing Iron&Steel United Co.,Ltd.;School of Material Science and Engineering,Southeast University)

机构地区：[1]南京钢铁股份有限公司 [2]东南大学材料科学与工程学院

出　　处：《宽厚板》2023年第2期4-8,17,共6页Wide and Heavy Plate

摘　　要：通过对80 mm厚度低温压力容器用A537CL1热轧钢板进行正火和模拟焊后热处理(SPWHT)试验,研究钢板在热处理过程中的组织演变规律及其对性能的影响。结果表明:热轧钢板经过正火处理后铁素体细化,板厚1/4处强度降低而韧性大幅度提高,板厚1/2处强度和韧性无明显变化,塑性大幅度提高。SPWHT处理后,铁素体比例增加、渗碳体球化且分布在晶界处的渗碳体粗化、微合金析出相长大等组织演变导致强度和低温冲击韧性下降,因此对不同状态心部韧性低的原因进行了进一步分析。By implementing normalizing and simulatd post-weld heat treatment(SPWHT)tests on 80 mm thickness A537CL1 hot rolled steel plate for low temperature pressure vessel,the effects of microstructure evolution law on mechanical properties in the process of heat treatment are studied.The results show that the ferrite of hot rolled plate is refined after normalizing treatment,the strength at 1/4 thickness position is reduced while the toughness is greatly improved,the strength and toughness at 1/2 thickness position have no obvious changes while the plasticity is greatly improved.After SPWHT treatment,the proportion of ferrite increases,the spheroidization of cementite occurs and the cementite distributed at the grain boundaries coarsens,and the growth of microalloyed precipitates lead to the decrease of strength and low temperature impact toughness.The causes of low toughness at 1/2 thickness position in different states are further analyzed.

关 键 词：大厚度钢板 正火 SPWHT 碳化物 低温韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]