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高压缸套需具备耐蚀性及承受高压,工作条件较为恶劣,9Cr18高碳、高铬不锈钢能够满足其使用要求,但该材料热加工性较差,锻造过程中及锻后均易发生开裂,且锻后组织易存在孪晶碳化物,影响其使用寿命及耐蚀性。锻前加热采用低温阶段缓慢升温、高温阶段快速升温,减少δ铁素体的形成,提高锻造塑性;锻造采用镦粗及分散小变形的方式,在上平砧、下V砧上拔长,破碎粗大的铸态组织及碳化物;锻后热处理采用球化退火,严控冷却速度,解决了退火组织中存在大量孪晶碳化物的难题,得到粒状珠光体组织,满足了高压缸套的使用要求。
High-pressure cylinder liner with corrosion resistance and withstand high pressure, the working conditions are harsh, 9Cr18 high-carbon, high chromium stainless steel to meet their requirements, but the poor thermal processing of the material, forging process and forging are prone to cracking, And forging organizations prone to twin carbides, affecting their service life and corrosion resistance. Pre-forging heating slowly warmer stage low temperature, high temperature rapid heating stage, reducing the formation of δ ferrite, forging plasticity; forging by upsetting and small deformation of the way, in the anvil, the next V anvil on the long, broken Coarse as-cast microstructure and carbide; after forging heat treatment using spheroidizing annealing, the cooling rate is strictly controlled to solve the problem of a large number of twins carbide in the annealing organization to obtain granular pearlite, to meet the high-pressure cylinder liner requirements .