17-4PH泵轴弯曲失效原因分析

doi:10.3969/j.issn.1006-8805.2020.01.005

石油化工设备技术 ›› 2020, Vol. 41 ›› Issue (1): 19-22.doi: 10.3969/j.issn.1006-8805.2020.01.005

17-4PH泵轴弯曲失效原因分析

邓德伟^1,2，焦咏翔¹，黄治冶²，孙奇²，田鑫²

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

收稿日期:2019-09-19 接受日期:2019-12-25 出版日期:2020-01-21 发布日期:2020-01-21
作者简介:邓德伟，男，2003年毕业于中国科学院物理研究所和大连理工大学材料物理与化学专业，博士，主要从事机械装备再制造、材料表面工程及金属3D打印等研究工作，副教授。Email:deng@dlut.edu.cn

Cause Analysis on the Bending Failure of 17-4PH Steel Pump Shaft

Deng Dewei^1,2, Jiao Yongxiang¹, Huang Zhiye², Sun Qi², Tian Xin²

1. School of Materials Science and Engineering, Dalian University of Technology, Dalian, Liaoning, 116024;
2. Shenyang Blower Works Group Corporation, Shenyang, Liaoning, 110869

Received:2019-09-19 Accepted:2019-12-25 Online:2020-01-21 Published:2020-01-21

摘要/Abstract

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1 020~1 060 ℃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。

关键词: 17-4PH钢, 泵轴, 弯曲失效, 残余奥氏体, 铁素体

Abstract: 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 1 020~1 060 ℃ 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.

Key words: 17-4PH steel, pump shaft, bending failure, retained austenite, ferrite

邓德伟，焦咏翔，黄治冶，孙奇，田鑫. 17-4PH泵轴弯曲失效原因分析[J]. 石油化工设备技术, 2020, 41(1): 19-22.

Deng Dewei, Jiao Yongxiang, Huang Zhiye, Sun Qi, Tian Xin. Cause Analysis on the Bending Failure of 17-4PH Steel Pump Shaft[J]. Petro-chemical Equipment Technology, 2020, 41(1): 19-22.

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17-4PH泵轴弯曲失效原因分析

Cause Analysis on the Bending Failure of 17-4PH Steel Pump Shaft

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