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Li Zhiyuan, Hu Lunji, Lin Zhaofeng. STRESS RELAXATION TEST WITH SINGLE IMPLANT FOR REHEAT CRACKING TENDENCY ASSESSMENT OF LOW ALLOY STEELS[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 1987, (1): 23-30.
Citation: Li Zhiyuan, Hu Lunji, Lin Zhaofeng. STRESS RELAXATION TEST WITH SINGLE IMPLANT FOR REHEAT CRACKING TENDENCY ASSESSMENT OF LOW ALLOY STEELS[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 1987, (1): 23-30.

STRESS RELAXATION TEST WITH SINGLE IMPLANT FOR REHEAT CRACKING TENDENCY ASSESSMENT OF LOW ALLOY STEELS

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  • Received Date: October 09, 1986
  • During isothermal stress-relaxation test performed to assess the reheat cracking tendency of materials,failures were encountered owing to premature yielding of thes amples if Murry's formula (σ0=0.8σSET/ERT) is employed to determine the initiate stress.Repeated tests made on several HSLA steels show that the proper formula for choosing the initiate testing stress is σ0S=1.37-0.0016T.The requirement of the same initiate strain for stress relaxation at different temperatures is met and "C-shaped curves" of rupture time can be plotted.A creep plastic criterion (σ0r) for assessing the reheat cracking tendency of materials and an expression (σ02r2) for indicating the amount of the absorbed elastic energy by materials during stress relaxation have been suggested.It is considered that the results obtained can more truly reflect the reheat cracking tendency of materials.
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