Effect of Phosphorus on Reheat Cracking of Cr-Mo Steels
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概要
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This study was devoted to the influence of phosphorus on reheat cracking sensitivity of Cr-Mo steels from the view points of the combined effect of phosphorus, chromium and molybdenum. The systhetic Cr-Mo steels melted in our laboratory were used. Their phosphorus contents were varied from 0.004 to 0.1wt% for five sets of Cr-Mo contents. The cracking sensitivity of steels was evaluated by the term of critical restraint stress to produce cracking obtained by the modified implant method for reheat cracking. The cracking sensitivity was discussed being related to the phosphorus segregation to prior-austenite grain boundary. The phosphorus concentration of grain boundary was semi-quantitatively determined by measuring the depth of grain boundary etched by a certain etchant. The results are summarized as follows. (1)There exists a critical phosphorus content, pcrit, from which the cracking sensitivity remarkably increases with the increase of phosphorus content. pcrit values are : above 0.02, 0.01, 0.008, 0.014 and below 0.01wt% for 0Cr-0.5Mo, 0.5Cr-0.5Mo, 1Cr-0.5Mo, 1.3Cr-0.5Mo, and 2Cr-1Mo steels, respectively. (2)Phosphorus segregated to the prior-austenite grain boundary as early as in as-welded condition, and the degree of segregation corresponds to the degree of cracking sensitivity. (3)The grain boundary concentration of phosphorus becomes the maximum by tempering at about 500℃, which corresponds to the temperature of crack initiation.
- Faculty of Engineering, Mie Universityの論文
- 1984-12-20
Faculty of Engineering, Mie University | 論文
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