Analysis of Softening Reason of Reheating Steam Pipe Elbow
摘 要
某电厂再热蒸汽热段管道弯头在热推制后出现硬度偏低、组织异常的现象,为了分析该弯头组织性能劣化的原因,进行了模拟折弯试验及弯后热处理试验。结果表明: 在热变形过程中弯头组织发生动态再结晶,马氏体向铁素体+碳化物转变,导致硬度下降,再结晶后继续变形使铁素体沿变形方向被拉长;在成型结束后没有通过正火+高温回火处理来消除这种不正常的形变组织,是该弯头软化的主要原因。
Abstract
The hardness of the reheating steam pipe elbow of a power plant reduced and its microstructure was abnormal. In order to analyze the causes of the material deterioration, simulative bending test and heat treatment test were carried out. The results show that in the thermal deformation process, the dynamic re-crystallization occurred in elbow structure, and martensite transformed to ferrite and carbide, resulting in the hardness decrease. After re-crystallization the ferrite was stretched along the direction of deformation with transforming. After forming, normalized and tempering treatment was not carried out to eliminate the abnormal deformation structure, which was the main reason for elbow softening.
中图分类号 TG142.73 DOI 10.11973/lhjy-wl201601013
所属栏目 质量控制与失效分析
基金项目
收稿日期 2015/8/10
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备注汤淳坡(1963-),男,工程师。
引用该论文: TANG Chun-po,YANG Chao. Analysis of Softening Reason of Reheating Steam Pipe Elbow[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2016, 52(1): 46~49
汤淳坡,杨超. 再热蒸汽热段管道弯头软化原因分析[J]. 理化检验-物理分册, 2016, 52(1): 46~49
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参考文献
【1】韩志良.调质组织中铁素体成因分析[J].理化检验-物理分册,2015,51(2): 123-125.
【2】DL/T 515-2004 电站弯管[S].
【3】唐仁正.物理冶金基础[M].北京: 冶金工业出版社,1997.
【4】束国刚.超临界锅炉用T/P91钢的组织性能和工程应用[M].西安:陕西科学技术出版社,2006.
【5】马荣,燕青芝,杨亚峰,等.9Cr低活化马氏体钢冷变形及退火再结晶[J].金属热处理,2010,35(8): 52-56.
【6】郭延军.火电厂600 MW超临界机组用大直径热推A335P91弯头的力学性能探讨[J].电力机械,2008,119(29): 83-85.
【2】DL/T 515-2004 电站弯管[S].
【3】唐仁正.物理冶金基础[M].北京: 冶金工业出版社,1997.
【4】束国刚.超临界锅炉用T/P91钢的组织性能和工程应用[M].西安:陕西科学技术出版社,2006.
【5】马荣,燕青芝,杨亚峰,等.9Cr低活化马氏体钢冷变形及退火再结晶[J].金属热处理,2010,35(8): 52-56.
【6】郭延军.火电厂600 MW超临界机组用大直径热推A335P91弯头的力学性能探讨[J].电力机械,2008,119(29): 83-85.
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