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采用Gleeble热塑性试验及两种热裂纹试验方法(可调拘束试验和Sigmajig试验)对改进型316不锈钢的焊接性进行了评价。改进型316不锈钢熔合区及焊缝热影响区的热裂纹敏感性类似于普通的全奥氏体316型不锈钢,比以铁素体结晶为主的普通316型材料的要大。Gleeble热塑性试验结果与母材热影响区可调拘束热裂纹试验结果相吻合,表明改进型316不锈钢较核级316不锈钢的母材热影响区热裂纹敏感性要大。对于本试验材料,可调拘束及Sigmajig的试验结果有良好的对应关系。 采用新提出的热塑性判据,塑性恢复速率(RDR),成功地预测了母材金属对热影响区液化裂纹的敏感性。并发现Gleeble试验判据RDR与可调拘束试验判据(TCL、MCL和CHL)有着极好的对应性。
The weldability of the modified 316 stainless steel was evaluated using the Gleeble thermoplastic test and two hot-cracking test methods (adjustable confinement test and Sigmajig test). The improved hot-cracking susceptibility of the 316 stainless steel fusion zone and weld HAZ is similar to that of the conventional all-austenitic 316 stainless steel, which is larger than that of the conventional 316-type material mainly composed of ferrite crystals. The results of Gleeble test are in good agreement with those of the confined hot cracking test in the heat affected zone of base metal, which shows that the modified 316 stainless steel is more sensitive to hot cracking in the HAZ than the core 316 stainless steel. For the test material, adjustable binding and Sigmajig test results have a good correspondence. Using the newly proposed thermoplastic criterion and plastic recovery rate (RDR), the sensitivity of base metal to liquefaction crack in HAZ was successfully predicted. And found that Gleeble test criteria RDR and adjustable binding test criteria (TCL, MCL and CHL) has excellent correspondence.