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公开(公告)号：US09128018B2
公开(公告)日：2015-09-08
申请号：US14205876
申请日：2014-03-12
申请人： HITACHI METALS, LTD.
CPC分类号： G01N17/006 , G01N3/32 , G01N2203/0005 , G01N2203/0066 , G01N2203/0075 , G01N2203/024
摘要： A method for evaluating the corrosion-fatigue life of a steel material includes: bringing a corrosive medium into contact with a predetermined portion of the steel material; measuring strain on the steel material while applying cyclic loads to the steel material; measuring an N-th strain index from strain amplitude at the number of initial load applications and strain amplitude at the N-th load application (N is a natural number larger than the number of initial load applications); and estimating the corrosion-fatigue life of the steel material by comparing the N-th strain index with a previously certified life strain index.
摘要翻译： 评估钢材的耐腐蚀寿命的方法包括：使腐蚀介质与钢材的预定部分接触; 在钢材上施加循环载荷时测量钢材上的应变; 在第N次载荷施加下，初始载荷应用数量和应变幅度下的应变振幅测量第N个应变指数（N是大于初始载荷应用数量的自然数）; 并通过将第N个应变指数与先前认证的寿命应变指数进行比较来估算钢材的腐蚀疲劳寿命。
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公开(公告)号：US10119174B2
公开(公告)日：2018-11-06
申请号：US15114604
申请日：2015-05-26
申请人： HITACHI METALS, LTD.
发明人： Yousuke Nakano
IPC分类号： C21D6/00 , C22C38/24 , C21D9/00 , C21D1/18 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C21D7/13 , C21D1/25
摘要： Provided are a hot work tool material having an annealed structure effective for producing a finer quenched and tempered structure when made into a hot work tool, and a method for manufacturing a hot work tool. A hot work tool material which has an annealed structure and which is used upon being quenched and tempered, wherein the hot work tool material has a composition that can be adjusted to a martensite structure by the aforementioned quenching, and ferrite grains in a cross-section of the annealed structure of the hot work tool material have, in an oversize cumulative distribution based on the cross-sectional area of the ferrite grains, a grain diameter distribution such that the grain diameter is 25 μm or less as a circle equivalent diameter when the cumulative cross-sectional area is 90% of the total cross-sectional area. In addition, a method for manufacturing a hot work tool in which quenching and tempering is performed on the aforementioned hot work tool material.
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