SKT4模具钢的锻后热处理工艺

Heat treatment process of SKT4 die steel after forging

SKT4模具钢锻后经常规退火+扩氢退火热处理后,其组织为粗大珠光体+块状铁素体,组织偏析严重,热处理效率低,最终的热处理效果差。SKT4模具钢的优化热处理工艺为正火+回火,经优化工艺处理后,该钢的组织为珠光体+细小铁素体,组织明显细化。优化后工艺缩短了工艺周期,提高了热处理效率,达到了既能改善组织又避免氢脆的目的。

Microstructure of the forged SKT 4 die steel after conventional annealing and hydrogen diffusion annealing was coarse pearlite and blocky ferrite , and the micro-segregation was serious .The efficiency of the conventional annealing process on the final results was low .The optimized heat treatment process for the SKT 4 die steel is normalizing and tempering .After the optimal heat treatment , the microstructure of the SKT4 die steel is fine ferrite and pearlite , and it can be significantly fined by the optimal process .The optimal process can reduce heat treatment cycle , improve the efficiency , and fining the microstructure but can eliminate the hydrogen brittleness .