T10钢宽带激光相变硬化的组织与性能研究

采用宽带激光相变硬化工艺对T10钢表面进行了改性处理 ,并对改性后的组织与性能进行了研究 ,结果表明 ,硬化区组织为针状马氏体 +少量残余奥氏体。热影响区组织为少量针状马氏体 +珠光体 +网状渗碳体。基材组织为珠光体+网状渗碳体。淬硬层表面的洛氏硬度最高值为HRC6 3 5 ,淬硬层内的显微硬度分布均匀 ,最高显微硬度值约为HV94 0 ,从硬化区→热影响区→基材显微硬度呈梯度变化。激光相变硬化后淬硬层表面的残余应力分析表明 ,淬硬层表面存在压应力 ,压应力的最大值为 - 4 2 9MPa。

Study on Microstructure and Properties of T10 Steel by Wide-band Laser Transformation Hardening

T10 steel surface is modified by using wide-band laser transformation hardening,and the microstructure and properties modified was studied.The experimental results indicated that microstructure in hardening zone is comprised of acicular martensite and a small quantity of retained austensite.The microstructure in heat affected zone consists of a small quantity of acicular martensite,pearlite and cementite.The microstructure in substrate zone is totally pearlite and reticular cementite.The highest hardness value of hardening layer is HRC63.5.The distribution of microhardness in hardening zone is homogeneous.The hightest microhardness value is nearly HV940.The microhardness from hardening zone to heat affected zone to substuate is changed gradiently.The analysis of retained stress of handening layer by laser transformation hardening demonstrates that there exists pressure stress in hardening layer,and the largest pressure stress value is -429MPa.