3-Year Experience with 2.25 Cr-1.6 W (HCM2S) and 12Cr-0.4Mo-2W (HCM12A) Steel Tubes in a Power Boiler.

Modelling has now become a routine part of materials science. It is appropriate therefore to assess some of the successes and failures of the method and to understand how and if modelling differs from ordinary quantitative science. The subject is now sufficiently mature to bear some constructive self-criticism and to temper exaggerated claims. The discussion here of modelling methods and outcomes is intended to be generic, although the examples used come from the author's experience of work on metals.

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Review of Reheat Crack in Welded Joint of Low Alloy Heat-Resistant Steels

Chen

et al. 2017

KEM

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The current research status of reheat crack in welded joint of low alloy heat-resistant steels are outlined. Some new phenomena discovered in engineering in recent years are summarized, and related problems that remain to be studied are also presented. Reheat crack in welded joint is occurred frequently during postweld heat treatment (PWHT) or in service at elevated temperature. Mainly four mechanisms leading to reheat crack, respectively, impurity segregation grain boundary weakening, precipitation hardening, creep rupture and no-precipitation zone weakening have been generally accepted now. Several essential factors consist of parent material chemical composition, microstructure and thickness of welded joint, filler material, preheat and postheat procedures, welding energy input, PWHT parameter, and stress and strain and so on. Theoretical calculation methods, criterion of RoA (Reduction of Area) and several experimental methods are put forward to evaluate reheat crack susceptibility. Based on new issues emerged in engineering, problems of concerning reheat crack are necessary to be researched, which include at least mechanism and influence factors of new multi-element composite strengthening heat-resistant steels, the mitigation measures for increasing wall thickness weldment, the root cause analysis and prevention methods of conventional low alloy heat-resistant steels for long term service.

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3-Year Experience with 2.25 Cr-1.6 W (HCM2S) and 12Cr-0.4Mo-2W (HCM12A) Steel Tubes in a Power Boiler.

Cited by 3 publications

References 1 publication

Enhanced mechanical properties induced by refined heat treatment for 9Cr–0.5Mo–1.8W martensitic heat resistant steel

Enhanced mechanical properties induced by refined heat treatment for 9Cr–0.5Mo–1.8W martensitic heat resistant steel

Mathematical models in materials science

Review of Reheat Crack in Welded Joint of Low Alloy Heat-Resistant Steels

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