当前位置：首页 > 过刊浏览->2020年41卷第7期
HK40和HH40耐热合金辐射管弯头铸造组织与缺陷分析
Microstructure and Defects Analysis of As-cast HK40 and HH40 Heat-resistant Alloy Radiant Tube Elbow
浏览(1834) 下载(5)
- DOI:
- 作者:
- 刘东方 孟宇 张华霞 马国宏
LIU Dongfang;MENG Yu;ZHANG Huaxia;MA Guohong
- 作者单位:
- 中国航发北京航空材料研究院熔铸中心
Center of Melting&Casting,AECC Beijing Institute of Aeronautical Materials,Beijing 100094,China
- 关键词:
- 耐热钢 DSC 显微疏松 显微组织 碳化物类型
heat resistant steel DSC micro-porosities microstructure carbide type
- 摘要:
- 以HK40和HH40合金为研究对象,分析了两种辐射管弯头的铸态组织和缺陷,对铸造缺陷的类型及其分布规律进行了探讨。结果表明,HK40铸态组织为奥氏体和含骨架状碳化物的共晶组织,其碳化物主要类型是M7C3型;HH40铸态合金的组织由奥氏体、少量铁素体以及由奥氏体和碳化物构成的混合片层组织组成,其碳化物类型主要是M23C6型以及少量的M7C3型。HK40和HH40合金工业辐射管弯头铸件典型缺陷均为显微疏松,且壁厚中间位置处的疏松最为严重。HK40和HH40合金辐射管弯头中最严重区域的疏松分别达到12级和3级。HK40合金较HH40合金具有更宽的凝固区间,形成疏松的倾向性更大。
Taking HK40 and HH40 alloy as the research object,the microstructure and defects of two kinds of radiation tube elbow were analyzed,and the types and distribution of the defects were discussed.The results show that the as-cast microstructure of HK40 is austenitic and eutectic with skeleton-like carbide,and the main type of carbide is M7C3.The structure of as-cast HH40 alloy is composed of austenite,a small amount of ferrite,and a mixture of austenite and carbide.The carbide types are mainly M23C6 and a small amount of M7C3.The typical defects of HK40 and HH40 alloy industrial radiant tube elbow castings are all microporous,and the porosity is the most serious in the middle of the wall thickness.The looseness in the most serious area of HK40 and HH40 alloy radiant pipe elbow reaches grade 12 and grade 3,respectively.Compared with HH40 alloy,HK40 alloy has a wider solidification interval and a greater tendency to loose.