Method for improving refined and uniform structure of large-section-size austenitic steel forge piece

• Main Authors: WANG WEI, QI CHENG, YANG FANRONG, WU MENG, MAO XIANGYANG, SU GUOQUAN, LI ZHENXING, WANG ZHANGZHONG
• Format: Patent
• Language: Chinese; English
• Published: 02.04.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; FORGE FURNACES; FORGING; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; HAMMERING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PRESSING METAL; PUNCHING METAL; RIVETING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for improving the refined and uniform structure of a large-section-size austenitic steel forge piece, and belongs to the technical field of austenitic steel preparation processes. In the radial forging process, after the blank is heated to the preset temperature in a stepped temperature rise and heat preservation mode and subjected to heat preservation, multi-pass radial forging is conducted, and in the multi-pass radial forging, the forging ratio, the pressing deformation amount, the blank rotating speed and the blank feeding rate are gradually decreased along with the pass of radial forging; and in the violent temperature deformation process, the surface temperature of the forging rod is increased in a mode of increasing the striking frequency. Due to the fact that the heat conductivity of the austenitic steel is low, the core temperature is still high and kept at 1000 DEG C or above before the last pass of forging, the surface temperature of a forged rod is low and lower th