R5系泊链热处理工艺及其性能研究

发布时间：2018-01-31 07:50

本文关键词： R5级系泊链低温韧性裂纹尖端开口位移慢应变速率拉伸环境敏感断裂疲劳　出处：《上海交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：R5是目前能够进行批量生产的、用于海洋工程结构物系泊的最高等级的系泊链产品,其复杂严格的服役环境决定了对其综合性能的严格要求,而影响这些性能的其中一个重要因素是热处理,本文主要研究了不同热处理参数对R5级系泊链基本力学性能的影响及其部分服役性能。本文选取了三种不同的淬火温度、回火温度和保温时间通过正交试验方法研究了R5级系泊链的热处理工艺,并获得最佳性能匹配情况对应的热处理参数。此外,还分析了不同淬火方法,即一次淬火和二次淬火对R5级系泊链低温韧性的影响。同时,通过裂纹尖端开口位移(CTOD)值分析了R5级系泊链的抗裂纹扩展性能,验证了最佳热处理工艺下对应产品的焊缝质量。由于系泊链长期在海水中服役,其抗裂纹敏感性也是设计过程中必须考虑的问题,作者利用慢应变速率拉伸实验(SSRT)分析了R5级系泊链的抗环境脆化敏感性,通过分析试验环境条件下的断面收缩率与对比实验环境下的断面收缩率之比对产品的环境敏感断裂(EAC)性能进行了初步探讨。在疲劳方面,本文根据API-2SK规范,从模拟和实物试验两个方面分析了R5级系泊链的抗疲劳性能。
[Abstract]:R5 is the highest grade mooring chain product which can be produced in batch production and used in marine engineering structure mooring. Its complex and strict service environment determines the strict requirements for its comprehensive performance. One of the important factors affecting these properties is heat treatment. In this paper, the effect of different heat treatment parameters on the basic mechanical properties of R5 mooring chain and its partial service performance are studied. Three different quenching temperatures are selected in this paper. The heat treatment process of R5 mooring chain was studied by orthogonal test with tempering temperature and holding time, and the heat treatment parameters corresponding to the optimum performance match were obtained. In addition, different quenching methods were analyzed. The effect of primary quenching and secondary quenching on the low temperature toughness of R5 grade mooring chain is discussed. Meanwhile, the crack propagation resistance of R5 grade mooring chain is analyzed by the crack tip opening displacement (CTODD) value. The weld quality of the product under the optimum heat treatment process is verified. Because the mooring chain has been in service in seawater for a long time, the anti-crack sensitivity of the mooring chain is also a problem that must be considered in the design process. The resistance to environmental embrittlement of R5 mooring chain was analyzed by slow strain rate tensile test (SSRT). The properties of environmental sensitive fracture (EAC) of the product were discussed by analyzing the ratio of the shrinkage of the section under the test environment and the ratio of the shrinkage of the section under the contrast experimental environment. In this paper, the fatigue resistance of R5 class mooring chain is analyzed in terms of simulation and physical test according to API-2SK specification.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG156

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