17-4PH泵轴弯曲失效原因分析  

CAUSE ANALYSIS ON THE BENDING FAILURE OF 17-4PH STEEL PUMP SHAFT

作　　者：邓德伟[1,2] 焦咏翔 黄治冶 孙奇[2] 田鑫[2] Deng Dewei;Jiao Yongxiang;Huang Zhiye;Sun Qi;Tian Xin(School of Materials Science and Engineering,Dalian University of Technology,Dalian,Liaoning,116024;Shenyang Blower Works Group Corporation,Shenyang,Liaoning,110869)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]沈阳鼓风机集团股份有限公司研究院,辽宁沈阳110869

出　　处：《石油化工设备技术》2020年第1期19-22,I0002,共5页Petrochemical Equipment Technology

基　　金：辽宁重大装备制造协同创新中心基金;沈鼓-大工重大科研发展基金;高端控制阀产业技术协同创新中心基金;中央高校基本科研业务费专项资金

摘　　要：材质为17-4PH的泵轴存放一段时间后发生弯曲。从轴上切取3块样品,对其进行1020~1060℃固溶处理和540~560℃时效处理后空冷。然后,对热处理后的样品分别进行金相观察和洛氏硬度检测。17-4PH沉淀硬化不锈钢材质的微观组织应以板条状马氏体结构为主,但是通过金相观察发现,该泵轴材质的马氏体组织中出现了大量残余奥氏体,同时,在其轴向截面上还观察到了许多条带状δ铁素体。残余奥氏体在常温下具有向马氏体转变的趋势。泵轴放置不当易造成局部产生较大拉应力,进而诱发相变导致泵轴弯曲。The pump shaft made of 17-4PH steel bent after having been placed for a period of time.Three samples were cut from the shaft for experiment testing.These samples were given solution treating at 1020~1060℃and then aged at 540~560℃with following air cooling respectively.After heat treatment,metallographic observation and Rockwell hardness test were carried out.For the pump shaft of 17-4PH precipitation hardening stainless steel,the dominant microstructure should be composed of lath martensite.However,through metallographic observation,it was found that there was a large number of retained austenite among the lath martensite,and lots of banded ferrite was observed in the axial section.The retained austenite has a tendency to transform into martensite at room temperature.When the pump shaft is placed improperly,the highly localized tensile stress would induce phase transformation which leads to shaft bending.

关 键 词：17-4PH钢 泵轴 弯曲失效 残余奥氏体 铁素体 

分 类 号：TG1[金属学及工艺—金属学]