Heat treatment was done by many kinds of condition to compare the formation of hardenability. Each of prior structures was quenched at 820℃, and 870℃, Keeping time for them was different, namely immediately, 30 minutes and 60 minutes, and quenching was done in water, oil and air respectively after p...
Heat treatment was done by many kinds of condition to compare the formation of hardenability. Each of prior structures was quenched at 820℃, and 870℃, Keeping time for them was different, namely immediately, 30 minutes and 60 minutes, and quenching was done in water, oil and air respectively after pre-heat treatment such as normalizing, patenting and spherodizing was done. Each of structures was also taken a picture and compared with others' by optical microscope to review the effect of prior structures. Hardness distribution measurement was done by fracture plane testing method and hardenability relationship between prior structure and coolant, and that between quenching temperature and keeping time were indicated with hardenability curve by measuring Rockwell Hardness tester. Photographs which were taken a picture of structures done generally used oil quenching were compared with. The results obtained through experiment under this kind of conditions are as follows: 1. When hardenability test was done after quenching many kinds of structures, hardenability was increased in order that prior structure is fine, namely normalizing, patenting and spherodizing. 2. When quenching was done under three kinds of conditions such as water, oil and air, hardenability was increased in order of water oil and air. 3. When keeping time was immediately, 30 minutes and 60 minutes, hardenability. 4. Hardenability was increased at 870℃ when quenching temperature was at 820℃ and 870℃. 5. Oil quenched structures were martensite and rough in order of 60 minutes, 30 minutes, and doing immediately, and needle structure in martensite was marked.
Heat treatment was done by many kinds of condition to compare the formation of hardenability. Each of prior structures was quenched at 820℃, and 870℃, Keeping time for them was different, namely immediately, 30 minutes and 60 minutes, and quenching was done in water, oil and air respectively after pre-heat treatment such as normalizing, patenting and spherodizing was done. Each of structures was also taken a picture and compared with others' by optical microscope to review the effect of prior structures. Hardness distribution measurement was done by fracture plane testing method and hardenability relationship between prior structure and coolant, and that between quenching temperature and keeping time were indicated with hardenability curve by measuring Rockwell Hardness tester. Photographs which were taken a picture of structures done generally used oil quenching were compared with. The results obtained through experiment under this kind of conditions are as follows: 1. When hardenability test was done after quenching many kinds of structures, hardenability was increased in order that prior structure is fine, namely normalizing, patenting and spherodizing. 2. When quenching was done under three kinds of conditions such as water, oil and air, hardenability was increased in order of water oil and air. 3. When keeping time was immediately, 30 minutes and 60 minutes, hardenability. 4. Hardenability was increased at 870℃ when quenching temperature was at 820℃ and 870℃. 5. Oil quenched structures were martensite and rough in order of 60 minutes, 30 minutes, and doing immediately, and needle structure in martensite was marked.
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