マルエージング鋼のヒートチェック性におよぼすＮｉ量の影響

概要

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Effect of Ni content, range of 6% to 24%, on the heat checking resistance of 4%Mo -8%Co maraging steel were studied. The experimental results are as follows. (1) The heat-checking resistance for the total number, mean length and maximum length of heat checks, were improved with decreasing Ni content. In order to improve heat-checking resistance quantitatively, Ni content must be lowering to 18% at 873K, 12% at 923 and 973K, respectively. But crack length was significant level at 973K heat-checking test. (2) The effect of Ni was quantitatively converted to the HC value. HC= (Heat checking temp.) / (As temp.) Heat checking temp.:Heat checking temperature (K) As temp.:Austenite transformation temperature gained by 150K/s heating rate(K) ,which is equal to heat checking test . The heat-checking resistance were decreased drastically the HC value, above 1.0, whereas improved gradually with decreasing the HC value, below 1.0. (3) Austenite retransformation has occurred the HC value, above 1.0
電気製鋼研究会の論文