Title:
METHOD FOR ESTIMATING OPERATING TEMPERATURE OF CU (COPPER)-CONTAINING AUSTENITIC HEAT-RESISTANT STEEL, METHOD FOR ESTIMATING CREEP DAMAGE LIFE OF CU-CONTAINING AUSTENITIC HEAT-RESISTANT STEEL, METHOD FOR ESTIMATING OPERATING TEMPERATURE OF HEAT-CONDUCTIVE TUBE MADE OF CU-CONTAINING AUSTENITIC HEAT-RESISTANT STEEL, AND METHOD FOR ESTIMATING CREEP DAMAGE LIFE OF HEAT-CONDUCTIVE TUBE MADE OF CU-CONTAINING AUSTENITIC HEAT-RESISTANT STEEL
Document Type and Number:
WIPO Patent Application WO/2018/092259
Kind Code:
A1
Abstract:
In order to provide a creep damage life estimation method which is highly accurate and can easily estimate the operating temperature of an austenitic heat-resistant steel after long-term use or in a high temperature range, a hardened layer 2 is formed on a Cu-containing austenitic heat-resistant steel 5 by cold working, and the relationship between the amount of Cu-rich phase produced in the hardened layer 2 and the Larson-Miller parameter expressed as a function of operating temperature and operating time is determined in advance, after which a heat-resistant steel is subjected to cold working to form a hardened layer 2 on the surface of the heat-resistant steel prior to actual use, and then the amount of Cu-rich phase produced in the hardened layer 2 actually used at high temperature for a certain period of time is measured. The actual operating temperature is estimated from the relationship, determined in advance, between the amount of Cu-rich phase produced and the Larson-Miller parameter, the measured amount of Cu-rich phase actually produced, and the actual operating time. In addition, creep life can be estimated from the estimated operating temperature and actual operating stress, and the relationship, determined in advance, between the operating stress, operating temperature, and rupture time of the heat-resistant steel.
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Inventors:
SHIMIZU MASARU (JP)
Application Number:
PCT/JP2016/084232
Publication Date:
May 24, 2018
Filing Date:
November 18, 2016
Export Citation:
Assignee:
MITSUBISHI HITACHI POWER SYS (JP)
International Classes:
G01N17/00; F22B37/38; G01K11/00; G01N33/20
Foreign References:
| JP2009036670A | 2009-02-19 | |||
| JP2003254916A | 2003-09-10 | |||
| JP2012145538A | 2012-08-02 | |||
| JP2003035608A | 2003-02-07 |
Attorney, Agent or Firm:
KAMEI Takeyuki (JP)
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