機械專業(yè)畢業(yè)設(shè)計--外文資料和翻譯-其他專業(yè)-在線瀏覽
2025-03-24 12:28本頁面
【正文】 mation and cracking quenching decreases. One called hierarchical quenching, the method is: will the austenitic steel in temperature is higher than that of martensite transformation temperature (Ms), salt bath time until the temperature uniformity, at the beginning of forming bainite, then put before air cooling, heat generated from the start when the same hardware quenching cracking, martensite and warpage cause of high thermal stress or eliminate stress have been quenched. In a similar method of temperature, then, is called the isothermal quenching (austenitic steel in salt bath), keep for a long time, the result is formed with the isothermal bainite. Bainite structure in the same ingredients as the formation of martensite hard, but in normal hardened steel, reduce the heat shock, by further processing, unnecessary in high hardness can be obtained when good impact toughness. Five, tempering To adjust hardened steel used the third step is often backfire. Besides the isothermal quenching steel quenching condition usually used in most all can use in production. To produce martensite steel to quench make hard, macro and micro stress, stress, low plasticity materials. To reduce the harm that can be heated to steel again by lowtemperature shift (A1) below a certain temperature. Hardened steel structure change of tempering time and temperature is the function of temperature, which is the most important. Must be hardened is emphasized, method, but the reverse is true. Steel is tempered by heat treatment of hardened steel, through the tempering of heating, to release stress again, soften and improve plastic. The structural change and tempering causes change depending on performance of the heating temperature steel back. The higher the temperature, the temperature 畢業(yè)設(shè)計說明書 30 effect, so the choice is often sacrificed for the hardness and strength plasticity and toughness. Again, to quench heating to influence of carbonsteel, in between, structure,
研究報告相關(guān)推薦
鄂ICP備17016276號-1