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تجزیه و تحلیل شکست مهندسی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • failure analysis of a weld-decayed austenitic stainless steel

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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 593
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the best known weld-related corrosion problem in austenitic stainless steels is sensitization which is one of the major reasons for intergranular of austenitic stainless steels in weld haz, sometimes known as weld decay. it is also well known that chromium carbide completely dissolves in austenitic stainless steels at temperatures above 1035 c. however, when these steels are slowly cooled down from these high temperatures or reheated into the range of 425–815 c, chromium depletion due to the chromium carbides precipitation at grain boundaries will cause weld decay. welding process is one of the most conventional and common causes of the sensitization, as the heat caused by weld thermal cycle brings part of the haz into precipitation temperature range. the sensitization caused by chromium depletion during welding can not be prevented effectively only by some conventional approaches, e.g., solution treatment, reduction of carbon content and stabilization treatment, etc. more recently, kokawa et al. reported that they used a new approach to obtain grain boundary engineered materials by means of inducing twin grain boundaries which could suppress the weld decay of austenitic stainless steel effectively [6]. although weld decay has been widely studied, failures caused by it are still reported. the objective of this paper is to document an investigation of a failure case about weld decay in type aisi 202 stainless steel. it also discusses other potentially misleading causes.

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